HIGH SPEED FAMILY OF ULTRA SMALL MODEMS

CH2056A /-B / ET-B

–

V.92 / 57,600bps / TBR21

CH1799A /-B / ET-B

–

V.34bis / 33,600bps / TBR21

CH1794A /-B / ET-B

–

V.32bis / 14,400bps / TBR21

FEATURES

INTRODUCTION

Supports V.92, V.90, V.34bis, V.34, V.32bis, V.23,

The CH2056A, CH1799A and CH1794A (HS Modem

V.32, V.22bis, V.22A/B, V.23, V.21, Bell 212A and

Family) are industrial grade high-speed modem

103.

modules. Each HS Modem product supports a range

CH2056A supports V.80 Synchronous operation.

of modem standards and speeds from 300bps to

14,400bps, 28,800bps, 33,600bps or 57,600bps. By

Error correcting: V.42 LAPM, MNP 2-4 and

using built in compression algorithms the operation

MNP10. MNP10 Data through put enhancement

speed can be expanded to the maximum DTE rate of

for cellular operation.

57.6kbps for the CH1794A, 115.2kbps for the

Data Compression: V.42bis, V.44, and MNP 5

CH1799A and 230.4kbps for the CH2056A. A choice

of error correcting schemes is available including MNP

DTE serial interface with speeds up to 230.4kbps

10 for cellular telephone applications. The HS Modem

(CH2056A),

115.2

(CH1799A)

or

57.6kbps

family supports Send and Receive FAX.

The

(CH1794A).

CH179XA-L/CH2056A-L

and

CH179XAR-

RoHS Compliant versions available.

L/CH2056AR-L operates exclusively on non-voltage

Low Power 3.3V operation: 170mW (nominal).

bearing leased line.

5V operation: 300mW (nominal).

The HS Modem family is pin compatible with

Automatic baud rate adaptability utilizing speed

Cermetek’s low cost CH1786A V.22bis, 2400bps

sensing, flow control and data buffers.

modem family. Each module in the HS Modem family

is a self-contained modem and is FCC Part 68

DTMF Encoding and Decoding.

approved (pending) and Industry Canada approved

Send & Receive FAX class 1, Group 3 supported.

(pending).

Additionally, the CH179XA/CH2056A-

Serial V.24 interface: 5V tolerant.

B/ET-B

and

the

CH1799AR/CH2056AR-B/ET-B

products meet the European TBR21 requirements.

NVRAM directory and stored profiles.

AT Command structure, with extensions.

These ultra small modules are designed for PCB

Built-in DAA with 1500 VAC RMS isolation 2122V

through-hole mounting and are 1.01” x 1.27” x 0.52”

peak surge protection.

(nominal) in size. The HS Modem family requires only

two external interfaces: a ITU-T V.24 serial interface

UL 60950 and CSA C22.2 950 Recognized

for direct access to a UART, and a Tip and Ring RJ-

(E251266) (pending).

11C Jack for the PSTN line connection.

The HS

FCC Part 68 approved (pending):

Modem can be controlled with industry standard AT

commands and is compatible with available industry

US:B46MM07BCHXXXXAYY.

communication software.

Industry

Canada

CS-03

Part

I

Registered

(pending):

IC:176A-CHXXXXAY.

DESCRIPTION OF FUNCTIONAL BLOCKS

AND DISCUSSION OF BASIC OPERATIONS

PCM upstream (V.92 only).

Figure 1 contains a functional block drawing of the HS

Modem-on-Hold (V.92 only).

Modem family of products. Each HS Modem product

Quick Connect (V.92 only).

consists

of

a

serial

interface

buffer,

modulator/demodulator, modem controller with error

Size: 1.01” x 1.27” x 0.52” (nominal).

correction and data compression, non-volatile RAM

Pin compatible with low speed CH1786A.

and a DAA.

Fast Connect (V.22).

Serial Host Interface Buffer. The HS Modem utilizes

Caller ID (optional).

a serial V.24 EIA 232-E 5V interface to control the

Zero Power (optional).

modem. The HS Modem products can communicate

over the serial interface with the Data Terminal

Off-Hook Indication (optional).

Equipment (DTE) at a fixed speed regardless of the

Leased Line version available.

carrier line modulation speed (DCE) of the PSTN

modem connection. This eliminates the need to have

TBR21 Compliant version available.

 2007 Cermetek Microelectronics, Inc.

Page 1

Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

the DTE step up or step down in speed based on the

The HS Modem family is designed to meet North

in-coming or out-going PSTN communication data

American telephone standards as set by the FCC Part

rate. Hence, the DTE can train the CH2056A, to say

68 (USA) and CSA CS-03 Part I (Canada). Among the

56kbps, and talk to a slower in-coming data

more critical parameters, the PSTN line interface is

connection at say, 2400bps without changing host

designed to meet 1500 VAC RMS isolation and

speed. Conversely, the host DTE trained at 14.4kbps

provide 2122V peak surge protection. Consequently,

can also communicate with the modems at higher

the HS Modem family of products satisfies U.S. and

speeds, say 28.8kbps.

This is accomplished by

Canadian

requirements,

and

will

meet

other

invoking internal automatic data flow control. The HS

international

approval

agency

requirements

that

Modem family has a resident buffer to allow for this

specify these levels of isolation.

auto baud operation.

Pins 1 and 2 function as both input and output

connections to the PSTN. To maximize field reliability

in hostile environments, for Canadian approval, for UL

compliance, and also optionally for FCC Part 15

compliance, these two pins must be routed through an

external network such as that briefly described in

Figure 6A and described in more detail in Cermetek

Application Note # 126.

Each HS Modem product comes with FCC Part 68

approval and is shipped from the factory with an FCC

Label indicating registration number and ringer

equivalent. This label should be prominently displayed

on the end product. Canadian approval for CH1799A

is listed on page 1.

Canadian approvals for other

products in Cermetek’s High Speed Modem Family are

available upon request. With the exception of the U.S.

Figure 1. Functional Block Diagram of HS Modem

and Canada, most countries require submission of the

Family.

final product or system containing the HS Modem to

the appropriate governing regulatory agency for

Non-Volatile RAM (NVRAM).

NVRAM can store

approval. Typically this is accomplished by submitting

user-customized

configurations.

The

AT&Wn

the final end product to an independent test house or

command will store the active modem configuration in

consultant for evaluation. The test house/consultant

one of two NVRAM locations as selected by an n of 0

then

forwards

the

test

results

and

applicable

or 1. The AT&Yn command selects one of the stored

documents to the regulatory agency.

Contact

modem configurations to be automatically recalled and

Cermetek for a list of suggested consultants.

made active upon reset or power up.

The ATZn

command immediately recalls and activates a stored

Modulation/Demodulation/Error

Correcting

and

configuration. See Table 6 for storable S-Registers

Data Compression. These functions are provided by

and Commands.

an industry standard modem chip set which has been

adapted for use with the HS Modem family.

The

The NVRAM can save up to four telephone numbers,

Modulation/Demodulation

scheme

supports

line

with up to 31 digits or modifiers in each telephone

equalization, forward error correction and the industry

number.

The AT&Zn=s command will store s, the

modem standards listed below.

telephone number dial string. The ATDS=n command

will cause the modem to dial one of the four stored

telephone numbers. The NVRAM storage location for

SUPPORTED MODULATION STANDARDS

the four telephone numbers is selected by an n of 0, 1,

Bell 103

ITU-T V.22

2, or 3.

Bell212A

ITU-T V.22bis

ITU-T V.32

Telephone Line Interface or DAA. High performance

ITU-T V.32bis

modems are extremely sensitive to DAA (Data Access

ITU-T V.34

Arrangement) performance. The difference between a

ITU-T V.34bis

good modem and a fair one is in the DAA

ITU-T V.90

performance.

The HS Modem family includes a

ITU-T V.92

unique low distortion DAA designed for optimal

performance over all PSTN line conditions thereby

achieving the most reliable and best performance

PSTN connections.

 2007 Cermetek Microelectronics, Inc.

Page 2

Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

Error Correction. Error correction is enabled via the

\Nn command.

Enabling error correction overrides

&Qn and sets S36 and S48 values.

Refer to

Cermetek, “AT Commands and S-Registers”, for a

more detailed discussion.

The HS Modem supports V.42 LAPM, MNP 2-4, MNP

10 error correcting protocols.

The CH1794A uses

MNP5

data

compression

techniques

and

the

CH1799A/CH2056A uses V.42bis and V.44 data

compression, allowing data transmission rates of up to

a

maximum

of

57.6kbps/115.2kbps/230.4kbps,

respectively.

These high DTE data rates are

supported by the HS Modem serial interface via its

auto baud capability. Note that the maximum speed

attained is limited by the maximum speed available

from the DTE.

IMPORTANT NOTE

Figure 2. Example of Off Hook Indication using

The V.92 standard prescribes 56kbps downlink and

“H” version HS Modem and external LED and

48.8kbps uplink. Consequently, two V.92 modems

resistor.

connected back-to-back will transmit at 48.8kbps

(maximum).

NOTE

The minimum transmission rate is not stored and will

Ring Indicator (RI). The RI pin follows the frequency

default to 300bps upon execution of reset or upon

of the ring signal and toggles low when the modem

power up.

detects an incoming call. The ring signal is typically 20

to 30 Hz and is on for 2 seconds and off for 4 seconds.

Refer to, “AT Commands and S-Registers”, for a more

Although not TTL compliant, the RI pin can,

detailed discussion of the +MS command.

nonetheless, be utilized to activate external circuitry

including the external RST pin.

CONNECTING TO THE HOST UART

Off-Hook Indicator (OHI). The “H” version of the HS

Since a modem communicates data serially and most

Modem provides an active high signal on the OHI pin

host products handle data in a parallel format, a UART

(Pin # 18) indicating when the HS Modem goes off-

is needed to make parallel-to-serial and serial-to-

hook. The circuit in Figure 2 can be used to drive an

parallel translations.

external LED.

Note that the OHI output active (or

high) is 2.75-3.25 volts.

SUPPORTED FEATURES

+MS Command.

The user may override the

AT Command Set. The HS Modem supports the AT

automatic data rate function of the HS modems. This

Command set with extensions and can operate with

is accomplished by executing the +MS command.

industry standard communication software. The AT

This command allows the user to specify the desired

Commands are compatible with TR302.2/88-08006.

data modulation protocol. Further, the +MS command

may be used to force a desired data rate and/or

Serial Host Interface.

The HS Modem family

restrict the allowed data rate.

The supported

operates in asynchronous mode and supports a 5V,

modulation schemes are listed above.

RS232- like interface called V.24 (EIA-232-E). Signal

levels are TTL rather than RS-232C level compatible,

which allows direct connection of the HS Modem to the

The

following

examples

establish

the

V.22bis

host’s UART without level translating circuitry. See

modulation scheme:

Table 3 for a complete set of pin descriptions.

Enter:

AT+MS=V22B

The modem is controlled by sending serial commands

Result:

OK

over TXD and by monitoring serial status messages

returned on RXD. All other serial interface lines may

This is identical to the following explicit +MS

be utilized for the convenience of a particular

command:

application but are not required by the modem.

Unused outputs from the HS Modem should be left

Enter:

AT+MS=V22B,0,300,1200,300,1200

unconnected.

Unused inputs should be tied to the

Result:

OK

proper logic level. See Table 3.

 2007 Cermetek Microelectronics, Inc.

Page 3

Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

Speaker Interface.

The SPK output reflects the

Failure to provide such operating conditions could

receiver analog input and provides a signal that can be

cause the HS Modem to malfunction or to function

used to monitor call progress. The SPK signal can

erratically.

drive a 300-ohm load directly.

Typically, the SPK

signal is input into an audio power amplifier and the

The HS Modem family requires +5V ±5% supply. It is

amplifier, in turn, drives the speaker coil. The speaker

recommended that bypass capacitors be placed on the

is activated with the ATMn command. The speaker

power supply as close to the HS Modem’s supply input

volume is adjusted using the ATLn command; where n

pins as practical. It is recommended that a 10 µF or

is 0, 1, 2, or 3. Increasing numbers correspond to

greater tantalum capacitor in parallel with a 0.1 µF

higher volume.

Figure 3 indicates one method of

ceramic capacitor be used.

The user must also

driving an external 8-ohm speaker.

provide shielding from nearby sources of EMI, such as

relays, motors and other power supplies.

Sleep Mode. To minimize power consumption, the

HS Family of Modems includes a power reduction

Automatic Speed/Format Sensing. The HS Modem

feature called Sleep Mode. When activated, the HS

supports both Command and Data modes of

Family of Modems will automatically enter Sleep Mode

operation.

after 1 to 255 seconds of inactivity.

The inactivity

delay is selected using the S24 register. The S24 is

set to default to 0 by the factory which disables this

feature. The HS Family of Modems returns to normal

operation when a ring signal is received or upon an

input low signal on the TXD pin.

In Sleep Mode,

power is reduced to about 1/3 of normal operating

power.

30K

Zero Power Mode. The “P” versions of the HS Family

of Modems support Zero Power Mode operation. If an

application calls for zero power during standby

periods, this feature allows the power to the HS

Modem to be switched off using external circuitry and

then reapplied when the modem’s RI pin becomes

active. The HS Modem can thus be powered down to

zero current.

Referring to Figure 3, the controller activates the relay

switch, supplying power (+5V) to the HS Modem. In

this configuration, the ring signal is used to “wake up”

the HS Modem when the HS Modem is in the zero

Figure 3. Example of Zero Power Operation.

power state.

The HS Modem can automatically determine the

The user supplies an external pull-up resistor

speed and format of the data sent from the DTE over

(Cermetek recommends 30k ohms) to an active 5V

the serial interface; and can sense the following broad

source to limit the current drawn by the when the HS

range of speeds:

Modem is in zero power mode. An internal blocking

diode provides supply isolation.

CH1794A

300, 600, 1200, 2400, 4800, 7200,

9600, 12000, 14400, 19200, 38400, and

The pins of the HS Modem will be in an undefined

57600bps.

state when powered is switched off. This must be

CH1799A

300, 600, 1200, 2400, 4800, 7200,

taken into consideration to assure that no unwanted

9600, 12000, 14400, 16800, 19200,

signals are presented to the HS Modem during zero

21600, 24000, 26400, 28800, 38400,

power operation.

57600, and 115200bps.

CH2056A

300, 600, 1200, 2400, 4800, 7200,

Power Supply. The HS Modem module is a complex

9600, 12000, 14400, 16800, 19200,

set of sensitive subsystems.

During the course of

21600, 24000, 26400, 28800, 38400,

normal operation, the HS Modem decodes analog

57600, 115200, and 230400bps.

signals from the telephone line that are in the millivolt

range. Steps must be taken by the user to guarantee

The data formats in Table 1 are recognized by the HS

that power supply noise on all supply lines, including

Modem family of products. The HS Modem can sense

ground, does not exceed 25mV peak to peak.

If

data with mark or space parity and configures itself as

necessary, use dedicated power and ground planes.

described in Table 2.

 2007 Cermetek Microelectronics, Inc.

Page 4

Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

The HS Modem is trained to a selected speed with an

application, use a relay or zero impedance switch to

AT<CR> training sequence. Thus, the DTE to modem

disconnect T1 when in data mode.

serial interface speed can be set independent of the

DCE or line carrier connecting speed (with minor

When voice and data are both being used, and the T1

restrictions, see the AT+ MS command). This allows

pin is active, it is typical for voice communication to

greater flexibility when selecting DCE line carrier

precede data communication.

In this case, the

modulation speed thereby affording the user with

following commands should be used to configure the

optimum data throughput performance. To maximize

HS Modem to allow for full utilization of the Voice/Tone

effective modem data throughput speed, the DTE to

injection feature.

These commands disable auto-

modem serial interface speed should be set to the

answer and eliminate hang-up due to lack of carrier

highest speed available without invoking the use of the

signal.

HS Modem’s built-in flow control.

Although flow

control facilitates communication with higher speed

1. Enter: ATS0=0<CR>

modes by the DTE, use of flow control causes an

2. Enter: ATS7=255<CR>

overall throughput data rate penalty.

3. Enter: ATS10=255<CR>

Table 1. Data Formats Recognized by HS Modem

Family.

No. of

Character

Data Length

Stop

Length

Parity

(No. of Bits)

Bits

(No. of Bits)

None

7

2

10

Odd

7

1

10

Even

7

1

10

None

8

1

10

Odd

8

1

11*

Even

8

1

11*

*11 bit characters are sensed, but the parity bits are

stripped off during data transmission in Normal and

Error Correction modes.

Figure 3. Speaker Control Circuit.

Voice/Tone Injection Port. The HS Modem Family

The

following

command

sequences

illustrate

provides pin T1 to allow the user to share the PSTN

implementation

of

common

voice/tone

port

line interface associated with the modem for voice and

applications.

DTMF applications.

Figure 5 contains a schematic

which uses a 5 Volt single supply operational amplifier

1. To answer a voice call:

and indicates one possible configuration for voice/tone

(a) Enter: ATH1<CR>

utilization.

(b) Switch local voice source into T1

(c) Begin Voice Conversation

Refer to Cermetek Application Note #170, 2-4 Wire

Converter for Use with CH179X and CH2056 Modems,

2. To switch to data mode, switch local voice source

for an alternative voice/tone implementation that

from T1:

utilizes dual supply operational amplifiers.

(a) At the Originate Modem, enter: ATX1<CR>

(b) At the Answer Modem, enter: ATA<CR>

Table 2. HS Modem Auto Configuration Based on

DTE Configuration .

3. To disconnect (hang-up) a voice call or data call:

DTE Configuration

HS Modem

(a) Return to control mode by entering: +++

Configuration

(b) Enter: ATH<CR>

7 mark

7 none

7 space

8 none

4. To place a voice call using the HS Modem DTMF

8 mark

8 none

facilities:

8 space

8 even

(a) Enter: ATDT1234567<CR>

Where 1234567 is the phone number

All HS Modem products are designed with pin T1

(b) Then switch to local voice source

coupled directly to the internal DAA. When using the

HS Modem in data mode, T1 should float and be

Modem-on-Hold (MOH). The Modem-on-Hold (MOH)

disconnected from any potential signal because any

feature enables the CH2056A modem to temporarily

signal on T1 during data operation will affect the HS

pause a data call to the Internet by placing the call on

Modem’s output. If T1 is being asserted from another

hold to allow usage of the same PSTN line to accept

an incoming call or to initiate an outgoing voice call.

 2007 Cermetek Microelectronics, Inc.

Page 5

Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

This feature is available only with a connection to an

WARNING

ISP server supporting MOH. MOH can be executed

The HS Modem family of products has been FCC

using the +PMH and +PCW commands.

Refer to

Part 68 approved as data/FAX modems. Utilization

Cermetek document AT Commands and S-Registers,

of the Voice/Tone Port requires further registration.

for more details.

The FCC requires that the entire system, including

the HS Modem and the handset or DTMF

Quick Connect. The Quick Connect feature enables

transceiver, adhere to Part 68 rules.

the CH2056A modem to shorten the connect time of

subsequent calls to an ISP server supporting quick

connect. The Quick Connect feature is controlled via

The HS modem will stay off-hook with its carrier on

the +PQC command.

after the escape sequence is received.

The HS

Modem will return an OK status message when it is

PCM Upstream. PCM Upstream boosts the upstream

ready to accept commands. To put the HS Modem

data rates between the CH2056A and the ISP by

back into data mode, issue command ATO<CR> .

reducing the upload times for large files and email

attachments. A maximum of 48kbps upstream rate is

THE COMMAND FORMAT

supported with PCM Upstream enabled, in contrast to

HS Modem commands consist of three elements:

a maximum of 32.2kbps upstream rate with PCM

1. The attention sequence,

Upstream not enabled. PCM Upstream is controlled

2. The commands themselves and

via the +PCM command. PCM Upstream is disabled

3. A terminating carriage return.

by default.

Enter:

ATDT1234567<CR>

NOTE

Result:

Modem goes off-hook and tone dials phone

Modem-on-Hold, Quick Connect and PCM Upstream

number 1234567.

are only available with the CH2056A modems in

V.92 mode.

AT [Commands]<CR>.

Where: AT represents attention sequence. A and T

may be either upper or lower case but must be

MODEM CONTROL

the same case.

[ Command ] represents

The HS Modem may be controlled by sending serial

command strings.

ASCII command sequences. The commands are sent

to the modem serially on the TXD pin. After execution

Where: <CR> represents carriage return (ASCII 13 or

of a received command, the modem returns a serial

HEX 0D)

status message that completion status. Refer to Table

<LF> represents line feed (ASCII 10 or HEX

5 for a complete list of status messages.

0A)

The HS Modem will respond with one of the following

MODEM STATES

status messages depending on whether it is optioned

The HS Modem can be in either command mode or

for abbreviated (terse) or English (verbose) status

data mode. When the modem is idle, it is in command

messages.

mode by default and will recognize commands. When

data transmission is in progress, the HS modem is in

Result: 0 <CR> (Terse)

the data mode state and will not recognize commands.

or

To force the HS Modem to recognize commands, the

Result: <CR><LF>

host must send an “escape sequence” to the HS

OK

Modem forcing it out of data mode and into command

<CR><LF> (Verbose)

mode.

After accepting the AT<CR> command the HS modem

The escape sequence consists of a “guard time” (a

is in idle mode and is ready to accept additional

period where no characters are sent to the modem),

commands.

followed by 3 escape characters, followed by a second

guard time. At power-up, the guard time is set to 1

An alternate attention sequence A/ may be issued

second, and the escape character is set as ”+.” Note

which behaves much like the AT sequence except that

that a 50 msec delay is required between escape

it causes the last entered command specified with an

characters. These two parameters can be modified

AT prefix to be executed. When given, it must be in

via registers S2 and S12, respectively.

upper case ASCII. No carriage return is needed for

this command.

 2007 Cermetek Microelectronics, Inc.

Page 6

Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

Figure 4.

HS Modem Family Application Diagram.

When entering commands to the modem, the

INITIALIZING THE MODEM

backspace character-control-H (ASCII 8 or HEX 08)

Before commands may be sent to the HS Modem, the

can be used to edit mistakes. AT and A/ may not be

modem must be initialized. This is a two step process:

edited however. Multiple commands may be placed

on a command line. A command line may be as long

Step 1. Modem Reset.

This is accomplished by

as 40 characters, excluding the letters AT . By way of

applying a hardware-reset pulse to pin RST or

example, the command below instructs the HS Modem

by switching the power off then back on.

to configure itself to not echo characters when in

Step 2. Initial Modem Training. The modem must be

command mode ( E0 ) and then puts itself in answer

trained to the host DTE speed and parity (odd,

mode ( A ).

even, mark, space or none). These activities

are briefly described below.

Enter: ATE0A<CR>

Result: OK<CR><LF>

HS Modem Reset. Upon applying power to the HS

Modem, the HS Modem automatically generates an

AT Command Set. The available command set is

internal reset pulse.

The user can also reset the

divided

into

four

types

of

commands:

basic

modem externally by applying a high-going reset pulse

commands, ampersand, dial modifiers and percent

to the RST pin for at least 10 msec after the +5V

commands. Refer to the complete list in Table 6.

power

supply

has

stabilized.

Delay

sending

commands to the HS Mode for 2 seconds after reset

has been initiated to allow the HS Modem time to

properly reconfigure.

 2007 Cermetek Microelectronics, Inc.

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Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

On power up, or when reset is initiated either by the

It should be noted that the default connect result codes

ATZ<CR> command or by the RST pin, the modem

9-20 indicate DTE connection speed, not Carrier Line

will reconfigure to its default state with the line carrier

DCE speed.

Hence, a CH1794A will connect at a

modulation speed set to:

maximum speed of 19.2kbps (result code 16). The

CH1799A will connect at a maximum DTE speed of

1. 14.4kbps for the CH1794A.

38.4kbps (result code of 17) and the CH2056A will

2. 33.6kbps for the CH1799A.

connect at a maximum speed of 57.6kbps (result code

3. 57.6kbps for the CH2056A.

18) unless the DTE is forced to a higher speed by

selection of data compression.

In this case, the

If desired, any speed, error correction, or data

maximum DTE to modem speed is 230.4kbps (result

compression method available on the HS Modem can

code20).

be locked in, using the AT\Nn and/or AT+MS

commands.

IMPORTANT NOTE

Result codes 53-64 are supported by the CH1799A

Training the Modem. Each modem must be trained

and CH2056A.

Result codes 165-194 are only

to match the host DTE speed and parity so that it is

supported by the CH2056A. To obtain a detailed

able to recognize serial asynchronous commands sent

status report for a given modem communication

to it by the DTE.

configuration, use the AT\V1 command. Executing

this command at setup will cause the modem to

The DTE must retrain the modem each time a reset

connect and return a message consisting of <DTE

pulse is applied on RST or after a RESET serial

speed> <modulation> <error protocol> <line speed

command has been issued.

of connection>.

Extensions to the basic result code set may be

STATUS MESSAGES AND RESULTS CODES

specified by Register S95, which allows for the use of

A result code is issued by the HS Modem to the DTE

result codes 40-64, 165-194.

for all commands executed by the HS Modem except

dialing commands. Further, various activities on the

PSTN are also signaled to the DTE by the HS Modem.

LEASED LINE OPTION

All result codes have either a terse, short form version

The

CH179XA-L/CH2056A-L

and

CH179XAR-

(which is identified by a number followed by a <CR> )

L/CH2056AR-L is a leased line version of the

or a verbose long form English-like message version

CH1799A. Whereas the CH1799A requires an active

(which is preceded and terminated with a <CR> and

voltage bearing or wet PSTN line for normal

<LF> ).

operations (typically, 48VDC on-hook line voltage), the

CH179XA-L/CH2056A-L

and

CH179XAR-

The user may suppress certain subsets of the non-

L/CH2056AR-L is designed to operate over a non-

extended result codes.

This is accomplished by

voltage bearing or dry line.

selecting subsets of the result code set using the

ATXn command, where n=0, 1, 2 or 3. Optionally, the

The

CH179XA-L/CH2056A-L

and

CH179XAR-

user may specify an extended set of results codes

L/CH2056AR-L will only operate properly on a dry line.

(codes above 35) by setting Register S95. See the

Damage will occur if used on a wet line.

The

detailed description of results codes in Table 5.

CH179XA-L/CH2056A-L

and

CH179XAR-

L/CH2056AR-L does not support ring detect but does

All AT commands, other than dialing commands, will

support

off-hook

control.

Refer

to

Cermetek

be responded to with either an OK (short form result

Application Note # 116 for examples and instructions

code 0) or the command is valid or accepted, or with

to establish a connection over a leased dry line wire

an ERROR (result code 4) if the command is not

pair. Note that the length of the leased line is limited

recognized. The detail contained in the error result

to 20,000 feet.

Use PSTN line protection as

codes signaled to the DTE depends on the level of

recommended in Figure 6B and in Cermetek

message suppression employed by the user. As can

Application Note # 126.

Follow all applicable

be seen from Table 5, specifying X4 allows the HS

requirements for FCC Part 68 compliance. The User

Modem to utilize the entire range of non-extended

is responsible to ensure that FCC Part 68 compliance

messages, whereas X0 suppresses all but the very

is maintained.

basic result codes. Most of the result codes allowed

under X1, X2 and X3 are considered call progress

As an alternative, the CH1799A will operate on a

status codes and, in practice, are suppressed except

leased line if the line is made wet by application of a

for

the

case

of

debugging

activities.

It

is

DC voltage. Refer to Cermetek Application Note #

recommended that the non-extended result codes be

114 .

used in all cases.

 2007 Cermetek Microelectronics, Inc.

Page 8

Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

Table 3.

HS Modem Family Pin Descriptions.

PIN

NAME

TYPE

FUNCTION

1

RING

I/O

TELCO/TELSET INPUT . Directly connects to the telephone line’s RING lead through a

user supplied RJ-11C jack.

2

TIP

I/O

TELCO/TELSET INPUT . Directly connects to the telephone line’s TIP lead through a

user supplied RJ-11C jack.

3

T1

I/O

ANALOG VOICE INJECT . Input (See Figure 5). 2.2V P-P max. Let float if not used.

4

NC

-

No Connection.

5

SPK

O

SPEAKER . Audio output for speaker. See speaker control schematic in Figure 5.

6

NC

-

No Connection.

7

NC

-

No Connection.

8

NC

-

No Connection.

9

NC

-

No Connection.

10

TXD

I

TRANSMIT DATA . Active Low. Serial Transmit data input. Marking or a binary 1

condition is transmitted when a HIGH is asserted.

11

RXD

O

RECEIVE DATA . Active Low. Serial Receive data output. Received marking or binary

1 condition is indicated by HIGH.

12

NC

-

No Connection.

13

DTR

I

DATA TERMINAL READY . Active LOW. Switching off DTR can either return modem

to command state, disconnect phone call, or reset modem. DTR should be set LOW

when not used.

14

DSR

O

DATA SET READY . LOW indicates handshaking with a remote modem is in progress,

and/or the data carrier of a remote modem has been detected. Commands &S0 or &S1

must be executed to active to this pin.

15

RI

O

RING INDICATION. Active Low. This signal follows the frequency of the ringing signal

and is normally about 20 to 40 Hz for 2 seconds on with 4 seconds off. This pin is also

used for Zero Power option. See Figure 3.

16

CTS

O

CLEAR-TO SEND . Active LOW. Indicates that the modem is ready to accept data from

the DTE. Used for hardware Flow Control of data.

17

DCD

O

DATA CARRIER DETECT .

Active LOW.

Indicates a data carrier from a remote

modem has been detected. Must be enabled using the &C1 command.

18

NC

-

No Connection.

OHI

O

OFF-HOOK INDICATION. Active HIGH. Indicates when HS Modem goes off-hook.

ONLY present on “H” version products. See Figure 2.

19

VCC

-

POWER SUPPLY . 5 volts + 5% or 3.3 volts + 5%.: Noise should be less than 25mV

peak to peak.

20

GND

-

GROUND . Note: Noise should be less than 25mV peak to peak.

21

RST

I

RESET . Active HIGH. This input must be asserted HIGH for at least 10 ms to reset the

modem. RESET is then returned LOW for normal operation. If no system reset is

available, let this pin float let this pin float to enable the internal reset. Input impedance

of driving circuit should be <10K.

22

RTS

I

REQUEST TO SEND . Active LOW. Used for flow control. Should be tied low if not

used.

NOTE:

(1) If VCC has a slow power up ramp time, the internal reset may be ineffective.

(2) Do not drive LED’s directly from any output. Use Buffers.

 2007 Cermetek Microelectronics, Inc.

Page 9

Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

WARNING

Example:

Pulse dial 9, pause, touch-tone dial

Operation

of

the

CH179XA-L/CH2056A-L

and

number.

CH179XAR-L/CH2056AR-L on a standard PSTN

Enter:

ATDP9, T1234567<CR>

line will damage the CH179XA-L/CH2056A-L and

Result:

OK<CR><LF>

CH179XAR-L/CH2056AR-L and void its warranty.

Further, operation of the CH179XA-L/CH2056A-L

Redial Last Number. Use A/ , the repeat command,

and CH179XAR-L/CH2056AR-L on a dry line

to redial the last telephone number dialed when a busy

without using proper current limiting circuitry as

signal is received.

outlined in Cermetek Application Note # 126 may

cause damage to the CH179XA-L/CH2056A-L and

Go Off-Hook and Return to Command State. The

CH179XAR-L/CH2056AR-L and will also void its

modem can be forced to reenter the command state

warranty.

after going off-hook by issuing the ATDT command

with a semi-colon.

This is useful when using the

modem with an independent DTMF tone generator.

AT COMMAND APPLICATIONS

Example:

Touch-tone dial 9, pause, go off-hook,

Dialing a Phone Number. The Dial command takes

return for additional AT commands.

the form Dn , where n is a string of characters. In the

Enter:

ATDT9, T;<CR>

simplest form, n will be only the digits of the phone

Result:

OK<CR><LF>

number to be dialed.

Automatic Answering.

Some examples of Auto

Example:

Dial Number.

Answer:

Enter:

ATD1234567<CR>

1. Enter: ATS0=0<CR>

Modem will not auto-

Result:

Modem goes Off-Hook, dials

answer

2. Enter: ATS0=1-255<CR> Modem will answer on 1

In response to this command, the HS Modem goes

to 254 rings

Off-Hook and dials the telephone number “123-4567”

and then waits for a carrier from the distant modem. If

Note that when S0 is set to 0, the HS Modem will not

no carrier is detected within a given time (the default

auto-answer.

time is 30 seconds), the HS Modem automatically

releases the line and sends a NO CARRIER result

V.22 Fast Connect. The HS modem family supports

code. If a carrier is detected, the HS Modem gives a

non-standard V.22 fast connect protocols.

This

CONNECT result code and goes on-line, permitting

feature reduces the connect time to 3-4 seconds.

communication with the distant modem.

However, to utilize the fast connect protocol, this

protocol must be supported by both modems. Further,

The Dial command may also be issued without a

the DCE speed must be set to 1200 baud (i.e., V.22).

telephone number. ATD causes the modem to pick up

the telephone a line without dialing a number.

To setup the HS modem product to connect utilizing

Fast Connect, execute the following commands:

Pause During Dialing. When placing a call from an

Enter: AT+MS=V22,0,300,1200,300,1200<CR>

office with a telephone connected to a PBX, it may be

Result: OK<CR><LF>

necessary to dial an access code (usually the digit 9)

to get an outside line.

Inserting a comma in the

Enter: $F2<CR>

telephone number commands the modem to pause for

Result: OK<CR><LF>

a specific length of time. The factory default pause

time is 2 seconds.

This forces the modem to communicate using the V.22

protocol and to attempt to connect using Fast Connect.

Example:

Dial 9, pause, dial number.

If Fast Connect is not supported by the other modem,

Enter:

ATDT9, T1234567<CR>

the modem will connect using the standard V.22

Result:

Modem goes Off-Hook, dials

protocol.

Multiple commas may be used for a greater delay

Caller ID (CID). The “C” version of the HS Family

time.

supports Caller ID.

The +VCID command controls

reporting and presentation of the data provided by the

Touch Tone and Pulse Dialing. The modem can use

PSTN Caller ID services. Data is presented to the

DTMF (touch-tones) T , or dial pulses P when dialing a

DTE between the first and the second ring indication.

telephone number.

If the dial command does not

This command affects the data format for incoming

specify which type to use, the modem defaults to the

calls as the call is being received.

type last specified. The power-on default value is T .

 2007 Cermetek Microelectronics, Inc.

Page 10

Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

Enter:

AT+VCID=n <CR>

PHONE LINE CONNECTION GUIDELINES

Result:

OK<CR><LF>

1.

The HS Modem must be mounted in the final

assembly such that it is isolated from exposure to

Where n is a decimal number corresponding to the

any hazardous voltages within the assembly.

selected option as described below.

Adequate separation and restraint of cables and

cords must be provided.

0

Disable Caller ID reporting. (Default.)

2.

The circuitry from the HS Modem to the

1

Enables

Caller

ID

with

formatted

telephone line interface must be provided in

presentation to the DTE.

The data

wiring that carries no other circuitry other than

presented is in a <Parameter Description>

that specifically allowed in the FCC rules (such as

<Value> pair format.

The expected pairs

A and A1 leads).

are: date, time, name, and caller code

(telephone

number).

ASCII

data

is

3.

Connection to phone line should be made

presented.

through an RJ-11C jack.

2

Enables

Caller

ID

with

unformatted

4.

PCB traces from the modem’s RING and TIP pins

presentation to the DTE.

The data is

to the RJ-11C jack must be 0.1 inch spacing or

presented

in

a

continuous

string.

greater to one another and 0.2 inch spacing or

HEXADECIMAL data is presented.

greater to all other traces.

The traces should

have a nominal width of 0.020 inches or greater.

Refer to Application Note # 174, Caller ID Feature For

CH1786A, CH179XA and CH2056A Modems, for

5.

The RING and TIP PCB traces should be as

additional information and examples.

short as possible and oriented to prevent

coupling other high speed or high frequency

The AT+VRID command affects the format of the data

signals present on the host circuit PCB.

provided by the PSTN Caller ID services for the last

received call. The DTE is presented this data once

6.

No additional circuitry other than that shown in

every time the +VRID command is executed.

Figure 6 may be connected between the modem

module and the RJ-11C jack.

Doing so will

Enter: AT+VRID=n<CR>

invalidate the FCC approval.

Result: Data Stream from most recent call

7.

The HS Modem, the RJ-11C jack, the interfacing

Where n is a decimal number corresponding to the

circuitry and all PCB traces in between, must be

selected option as described below.

contained on a PCB with a 94 V-0 flammability

rating.

0

Reports

Caller

ID

with

formatted

presentation to the DTE.

The data is

8.

The supplied FCC registration label must be

presented the data items in a <Parameter

applied visibly on the outside of the product.

Description> <Value> pair format.

The

expected pairs are: date, time, name, and

9.

The product’s User Manual must provide the user

caller code (telephone number).

with instructions for connection and use as

recommended in the FCC Registration Section

1

Reports

Caller

ID

with

unformatted

below.

presentation to the DTE.

The HS modem family supports Caller ID.

Refer to Application Note # 174, Caller ID Feature For

CH1786A, CH179XA and CH2056A Modems, for

additional information and examples.

CANADIAN APPROVALS

The HS Modem family is approvable for use by

IMPORTANT NOTE

Industry Canada to CSA CS-03 Part I. The CH1799A

Caller ID (CID) requires that the PSTN service

has been approved by Industry Canada and the

provider supply the required data.

The Caller ID

registration number for CH1799A is listed on page 1.

feature will report the NULL string if the CID service

Approval for other products in this family are available

is not activated by the PSTN service provider.

upon request.

 2007 Cermetek Microelectronics, Inc.

Page 11

Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

PAN-EUROPEAN TBR21 APPROVALS

FOR YOUR USER’S MANUAL

The

CH179XA/CH2056A-B/ET-B

and

The Part 68 rules require the following (or equivalent)

CH1799AR/CH2056AR-B/ET-B products have been

be provided to the end user of the equipment

designed to meet the requirements of ETSI TBR – 021

containing a DAA:

Pan-European Approval for Connection to Analogue

Public Switched Telephone Networks in addition to the

Type of Service. The (insert end product name) is

FCC Part 68 conveyed approval, Canadian DOT CSA

designed to be used on standard device telephone

CS-03 Part I compliance and UL 60950 Edition 3/CSA

lines. It connects to the telephone line by means of a

C22.2 950 recognition. Test reports (as required for

standard jack called the USOC RJ-11C (or USOC

CE marking) demonstrating TBR21 compliance are

RJ45S). Connection to telephone-company-provided

available upon request.

coin service (central office implemented systems) is

prohibited. Connection to party lines service is subject

to state tariffs.

HS MODEM HANDLING AND ASSEMBLY

RECOMMENDATIONS

Changes in Attestation Procedure for Plugs and

The HS Modem contains static-sensitive components

Jacks. (Name of applicant) attests that the network

and should only be handled by personnel and in areas

interface plugs or jacks used on this equipment comply

that are properly protected against static discharge.

with and will continue to comply with the mechanical

requirements specified in Part 68, Sub-part F,

There

are

two

mounting

techniques

that

are

specifically the dimensions, tolerances and metallic

recommended for physically connecting the HS

plating requirements.

The compliance of these

Modem to a PCB:

connectors will be assured by purchase specifications

1. Direct soldering.

and incoming inspection.

Documentation of such

2. Sockets.

specifications and/or inspections will be provided by

the FCC within 30 days of their request for the same.

Direct Soldering.

The HS Modem may be wave

soldered onto a circuit card. All HS Modem products

Telephone Company Procedure. The goal of the

are hermetically sealed and will not be harmed by

telephone company is to provide you with the best

industry standard wave soldering processes.

service it can. In order to do this, it may occasionally

be necessary for them to make changes in their

Socketing.

The socketing approach to mounting

equipment, operations or procedures.

If these

eliminates cleaning and desoldering concerns. When

changes might effect your service or the operation of

the socket is used, it must make a solid connection to

your equipment, the telephone company will give you

all pins.

Failure to do so will cause unreliable or

notice, in writing, to allow you to make any changes

intermittent operation. Also, steps should be taken to

necessary to maintain uninterrupted service.

assure that the module remains tightly seated in the

socket after the end product is shipped. Cermetek

In certain circumstances, it may be necessary for the

recommends socket CES-150-01-T-S by Samtec, 50

telephone company to request information from you

pin strip socket.

concerning the equipment which you have connected

to your telephone line. Upon request of the telephone

company, provide the FCC registration number and

FCC REGISTRATION

the ringer equivalence number (REN); both of these

All products in the HS Modem family are registered

items are listed on the equipment label. The sum of all

with the FCC (except the CH1799A-L/CH1799AR-L)

of the REN’s on your telephone lines should be less

under Part 68.

To maintain the validity of the

than five in order to assure proper service from the

registration, you must serve notice to the end user of

telephone company. In some cases a sum of five may

the product of several restrictions the FCC places on

not be useable on a given line.

Consult your

the modem and its use.

telephone provider.

In addition to restriction notification, the FCC requires

If Problems Arise.

If any of your telephone

that Cermetek make all repairs to all products in the

equipment is not operating properly, you should

HS Modem family.

If repairs are necessary after

immediately remove it from you telephone line, as it

installation of the HS Modem and the end product has

may cause harm to the telephone network.

If the

been delivered to the end user, the end product must

telephone company notes a problem, they may

be returned to the end product supplier where the HS

temporarily discontinue service. When practical, they

Modem can be removed and then forwarded to

will notify you in advance of this disconnection.

If

Cermetek for repair.

The following notice is

advance notice is not feasible, you will be notified as

recommended and should be included in the end

soon as possible.

product’s user manual.

 2007 Cermetek Microelectronics, Inc.

Page 12

Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

When you are notified, you will be given the

Local modem will not grant RDL request from remote

opportunity to connect the problem and informed of

modem

your right to file a complaint with the FCC. Contact

Guard tones disabled

your local telephone service provider if you have any

Minimum DTR pulse width = .05 seconds

questions about your phone line.

Ring count – 00

Escape code character = 43 (+)

In the event repairs are ever needed on the (insert

Flash to on hook = 70 msec

your product name), they should be performed by

Auto speed detection enabled

(insert your company name), or an authorized

DTE connect speed, connect messages

representative or (insert your company name). For

Back space character = 08 (BS) Carriage return

information contact: (insert your company address).

character = 13 (CR)

Line feed Character = 10 (LF)

Duration of wait for dial tone =2 seconds

DEFAULT STATUS, PERFORMANCE AND

Duration of wait for carrier after dialing = 50 seconds

SPECS

Carrier detect response time = 0.6 seconds

Prior to delivery, Cermetek installs into each HS

Escape code guard time = 1 second

Modem the following default Configuration Profile:

Length of use after comma = 2.0 seconds

Last carrier to hang up delay = 1.4 seconds

Default Connect Speeds (DCE) are 14,400bps,

DTMF interdigit delay = .095 seconds

33,600bps and 57,600bps for CH1794A, CH1799A

Auto sync address or address detection =0

and CH2056A respectively

Connection detected at DTE – Highest speed

Serial port data rate auto baud enabled

38,400kbps

Bell 212A operation at 1200bps

Auto retrain enabled – 30 seconds attempts

Parity – none

MNP error correction mode can be negotiated (&Q5)

Auto answer disabled

MNP – non-extended service selected

Command echo ON

MNP error correction block size is 128 characters

All result codes enabled – except \REL codes

selected

Wait for dial tone before dialing – 2 seconds

Data compression – negotiation enabled

Dials with touch-tone (T)

Transmit break length is 0.3 seconds

Detects busy signal (ATX4)

All breaks are transmitted in sequence with data

Full word result codes – non-extended

Serial port flow control enabled = RTS/CTS

Pulse dial make/break ratio = 39/61-10pps

XON/XOFF flow control characters selected

Test timer set to 0 seconds, test modes disabled

Inactivity timer set to 0 minutes

CTS always active

DSR always active

IMPORTANT NOTE

DCD is ignored

Upon power-up the HS Modem will recall user profile

RTS to CTS delay - .01 seconds

0 which may override some of the above Factory

DTR always active – hang up after transition

Defaults.

If desired the user may, at their option,

Long space disconnect disabled

save the factory defaults in user profile 0.

Speaker enabled but off when receiving carrier

Speaker volume set to low

 2007 Cermetek Microelectronics, Inc.

Page 13

Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

Table 4.

Result Code Summary.

Table 4.

Result Code Summary (Continuation).

Result Code Form

n is ATXn

Notes

Result Code Form

n is ATXn

Notes

Command

Command

Terse

Verbose or Long

0

1

2

3

4

Terse

Verbose or Long

0 1 2 3 4

or

or

Short

Short

+F4

+FCERROR

X

X

X

X

X

67

+DR: V42B

X X X X X

0

OK

X

X

X

X

X

68

+DR: V44

X X X X X

1

CONNECT

X

X

X

X

X

69

+DR: None

X X X X X

2

RING

X

X

X

X

X

70

+ER: NONE

X X X X X

3

NO CARRIER

X

X

X

X

X

77

+ER: LAPM

X X X X X

4

ERROR

X

X

X

X

X

78

+MRR: 31200

X X X X X 2

5

CONNECT 1200

1

X

X

X

X

79

+MRR: 33600

X X X X X 2

6

NO DIAL TONE

3

3

X

X

X

80

+ER: ALT

X X X X X

7

BUSY

3

3

3

X

X

81

+ER:

ALT-

X X X X X

8

NO ANSWER

X

X

X

X

X

CELLULAR

9

CONNECT 0600

1

X

X

X

X

83

LINE IN USE

X X X X X

10

CONNECT 2400

1

X

X

X

X

84

CONNECT 33600

1 X X X X 2

11

CONNECT 4800

1

X

X

X

X

85

OFF-HOOK

X X X X X

12

CONNECT 9600

1

X

X

X

X

INTRUSION

13

CONNECT 7200

1

X

X

X

X

86

LINE REVERSAL

X X X X X

14

CONNECT 12000

1

X

X

X

X

DETECTED

15

CONNECT 14400

1

X

X

X

X

87

NO LINE

X X X X X 2

16

CONNECT 19200

1

X

X

X

X

91

CONNECT 31200

1 X X X X

17

CONNECT 38400

1

X

X

X

X

130

+ILRR

X X X X X

18

CONNECT 57600

1

X

X

X

X

134

+MCR: B103

X X X X X

19

CONNECT

1

X

X

X

X

135

+MCR: B212

X X X X X

115200

136

+MCR: V21

X X X X X

20

CONNECT

X

X

X

X

X

137

+MCR: V22

X X X X X

230400

138

+MCR: V22B

X X X X X

22

CONNECT

1

X

X

X

X

139

+MCR: V23

X X X X X

75TX/1200RX

139

+MCR: V23C

X X X X X

23

CONNECT

1

X

X

X

X

140

+MCR: V32

X X X X X

1200TX/75RX

141

+MCR: V32B

X X X X X

24

DELAYED

4

4

4

4

X

142

+MCR: V34

X X X X X 3

25

MESSAGE-

X

X

X

X

X

145

+MCR: V90

X X X X X 3

WAITING

146

+MCR: V92

X X X X X 3

32

BLACKLISTED

4

4

4

4

X

147

+MCR: V92

X X X X X 3

33

FAX

X

X

X

X

X

150

+MRR: 32000

X X X X X 3

35

DATA

X

X

X

X

X

151

+MRR: 34000

X X X X X 3

39

+MRR: 75

X

X

X

X

X

152

+MRR: 36000

X X X X X 3

40

+MRR: 300

X

X

X

X

X

153

+MRR: 38000

X X X X X 3

42

+MRR: 600

X

X

X

X

X

154

+MRR: 40000

X X X X X 3

44

+MRR: 1200/75

X

X

X

X

X

155

+MRR: 42000

X X X X X 3

45

+MRR: 75/1200

X

X

X

X

X

156

+MRR: 44000

X X X X X 3

46

+MRR: 1200

X

X

X

X

X

157

+MRR: 46000

X X X X X 3

47

+MRR: 2400

X

X

X

X

X

158

+MRR: 48000

X X X X X 3

48

+MRR: 4800

X

X

X

X

X

159

+MRR: 50000

X X X X X 3

49

+MRR: 7200

X

X

X

X

X

160

+MRR: 52000

X X X X X 3

50

+MRR: 9600

X

X

X

X

X

161

+MRR: 54000

X X X X X 3

51

+MRR: 12000

X

X

X

X

X

162

+MRR: 56000

X X X X X 3

52

+MRR: 14400

X

X

X

X

X

165

CONNECT 32000

X X X X X 3

53

+MRR: 16800

X

X

X

X

X

2

166

CONNECT 34000

X X X X X 3

54

+MRR: 19200

X

X

X

X

X

2

167

CONNECT 36000

X X X X X 3

55

+MRR: 21600

X

X

X

X

X

2

168

CONNECT 38000

X X X X X 3

56

+MRR: 24000

X

X

X

X

X

2

169

CONNECT 40000

X X X X X 3

57

+MRR: 26400

X

X

X

X

X

2

170

CONNECT 42000

X X X X X 3

58

+MRR: 28800

X

X

X

X

X

2

171

CONNECT 44000

X X X X X 3

59

CARRIER 16800

1

X

X

X

X

2

172

CONNECT 46000

X X X X X 3

61

CARRIER 21600

1

X

X

X

X

2

173

CONNECT 48000

X X X X X 3

62

CARRIER 24000

1

X

X

X

X

2

174

CONNECT 50000

X X X X X 3

63

CARRIER 26400

1

X

X

X

X

2

175

CONNECT 52000

X X X X X 3

64

CARRIER 28800

1

X

X

X

X

2

176

CONNECT 54000

X X X X X 3

66

+DR: ALT

X

X

X

X

X

180

CONNECT 28000

X X X X X 3

 2007 Cermetek Microelectronics, Inc.

Page 14

Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

Table 4.

Result Code Summary (Continuation).

Table 5.

AT Command Summary.

Result Code Form

n is ATXn

Notes

Command Function

Command

A/

Re-execute command

Terse

Verbose or Long

0

1

2 3 4

A

Go off-hook and attempt to answer call

or

Short

B0

Select CCITT connection at 300 or

181

CONNECT 29333

X X

X X X 3

1200bps

182

CONNECT 30667

X X

X X X 3

B1

Sect Bell connection at 300 or 1200bps

183

CONNECT 33333

X X

X X X 3

Dn

Dial modifier

184

CONNECT 34667

X X

X X X 3

P

Pulse Dial

185

CONNECT 37333

X X

X X X 3

T

Touch Tone Dial

186

CONNECT 38667

X X

X X X 3

W

Wait for Dial Tone

187

CONNECT 41333

X X

X X X 3

;

Return to Command State

188

CONNECT 42667

X X

X X X 3

@

Wait for Quiet Answer Command

189

CONNECT 45333

X X

X X X 3

!

Flash Hook

190

CONNECT 46667

X X

X X X 3

,

Pause

191

CONNECT 49333

X X

X X X 3

0-9/ABCD Dial Digits/Characters & wait

192

CONNECT 50677

X X

X X X 3

for credit card dial tone

193

CONNECT 53333

X X

X X X 3

^

Toggles calling tone

194

CONNECT 54377

X X

X X X 3

195

+MRR: 28000

X X

X X X 3

L

Redial last number

196

+MRR: 29333

X X

X X X 3

*,#

Star digit – tone dialing

197

+MRR: 30667

X X

X X X 3

S=n

Dial the number and store in

198

+MRR: 33333

X X

X X X 3

Directory, n= 0 to 3

199

+MRR: 34667

X X

X X X 3

E0

Disable command echo

200

+MRR: 37333

X X

X X X 3

E1

Enable command echo

201

+MRR: 38667

X X

X X X 3

H, H0

Initiate a hang-up sequence

202

+MRR: 41333

X X

X X X 3

H1

If on-hook, go off-hook and enter

203

+MRR: 42667

X X

X X X 3

command mode

204

+MRR: 45333

X X

X X X 3

L0

Set low speaker volume

205

+MRR: 46667

X X

X X X 3

L1

Set low speaker volume

206

+MRR: 49333

X X

X X X 3

207

+MRR: 50667

X X

X X X 3

L2

Set medium speaker volume

208

+MRR: 53333

X X

X X X 3

L3

Set high speaker volume

209

+MRR: 54667

X X

X X X 3

M0

Speaker off

210

+MRR: 25333

X X

X X X

M1

Speaker on during hand shaking and

211

+MRR: 26667

X X

X X X

speaker off while receiving carrier

212

+MRR: 25333

X X

X X X

M2

Speaker on during hand shaking and

213

+MRR: 22666

X X

X X X

while receiving carrier

214

DIGITAL LINE

X X

X X X

M3

Speaker off during dialing and receiving

DETECTED

carrier

and

speaker

on

during

answering

O0

Go on-line

TABLE 4 NOTES

O1

Go

on-line

and

initiate

a

retrain

sequence

1. An “X” in a column indicates that the message

Sn

Select S Register n

(either the long form if verbose, or the value only

Sn=m

Write value m to S Register n

for short form) will be generated when that

Sn?

Read the value of S Register n

particular value of “n” (shown at the top of the

?

Returns Last addressed S Register

column) has been selected by the use of Xn . A

value

numeral indicates which more explicit message

V0

Short Form Result Code Option

will be output for that X option.

V1

Long Form Result Code Option

W0

Reports DTE Speed

2. Applicable to CH1799A and CH2056A models

W1

Reports DCE Speed and Error

only.

Correction

W2

Reports DCE Speed Only

3. Applicable to CH2056A models only.

X1, X2,

Result Code Reporting Options

X3, X4

+++

Escape Code Sequence

Z0, Z1

The modem performs soft reset.

Restore stored profile 0 or 1 after reset

 2007 Cermetek Microelectronics, Inc.

Page 15

Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

Table 5.

AT Command Summary (Continuation).

Table 5.

AT Command Summary (Continuation).

Command

Function

Command

Function

&C0

Force DCD active regardless of the

V.92 COMMANDS

carrier state

+PCW

Enable/Disable

Call

Waiting

&C1

DCD to follow the carrier state

Detection

&D0

Modem ignores DTR

+PCM

Enable/Disable PCM Upstream

&D1

Modem assumes command state

+PIG

PCM Upstream Ignore

&D2

Modem

hangs

up,

assumes

+PMH

Enable/Disable MOH

command state and disables auto-

+PMHF

MOH Hook Flash

answer

+PMHT

MOH Timer

&D3

Modem assumes initialization state

+PMHR

Initiate MOH

&F0

Restore Factory configuration 0

+PQC

Enable/Disable Quick Connect

&F1

Restore Factory configuration 1

+PSS

Use Short Startup Sequence

&G0, 1, 2

Guard Tone Options

+QCPC

Force Full Startup Sequence

&K0

Disable DTE/DCE flow control

+QCPS

Enable/Disable

Quick

Connect

&K1,2

Not Supported

Profile Save

&K3

Enable RTS/CTS DTE/DCE flow

CALLER ID COMMANDS

control

+VCID

Select data presentation format n

&K4

Enable XON/XOFF DTE/DCE flow

(0-2) for incoming calls.

control

+VRID

Select data presentation format n

&K5

Enable transparent XON/XOFF flow

(0-1) for most recently received

control

incoming call.

&P0, 1, 2, 3

Make to Break Ratio Options

ERROR CORRECTING COMMANDS

&Q0

Select direct asynchronous mode

%C0

Disable data compression.

&Q1,2,3,4

Not Supported

&Q5

Modem negotiates an error corrected

%C1

Enable MNP5 data compression.

link

%C2

Enable V.42bis data compression

&R0

CTS tracks RTS

%C3

Enable both V.42bis and MNP 5

&R1

CTS always on

compression

&S0

DSR always on

STORED PROFILE COMMANDS

&S1

DSR active after answer tone

&V

Display current configuration

detected and inactive after loss of

&W0

Store the active profile in NVRAM

carrier

profile 0

&T0

Terminate Loopback Test

&W1

Store the active profile in NVRAM

&T1

Initiate Analog Loopback Test

profile 1

\Bn

Send break of n x 100 msec (n=0 to

&Y0

Recall stored profile 0 upon power

9)

up

\N0

Select normal speed buffered mode

&Y1

Recall stored profile 1 upon power

\N1

Select direct mode

up

\N2

Select reliable mode

&Zn=x

Store dial string x (31 digits max)

\N3

Select auto reliable mode

to location n (0-3)

\N4

Force LAPM mode

MNP10 COMMANDS

\N5

Force MNP mode

-K0

Disable

MNP

10

extended

\V0

Connect messages are controlled by

services

the command settings X, W, and

-K1

Disable

MNP

10

extended

S95

services

\V1

Connect messages are displayed in

-K2

Disable

MNP

10

extended

the single line format

services

MODULATION COMMANDS

FAX COMMANDS

+MS

Select modulation

+FCLASS=n

Service Class

+MCR=n

Carrier protocol n reporting

+F<cmd>?

Report active configuration for

specified command cmd

+MR=n

Select

extended

Modulation

+F<cmd>=?

Report capabilitied for specified

Reporting of +MCR and +MRR to

command cmd

DTE

+FAA=n

Data/Fax Auto Answer

+MRR=m, n

Report Transmit m and Receive n

DCE rates to DTE

+FAE=<value>

Auto Answer

 2007 Cermetek Microelectronics, Inc.

Page 16

Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

Table 5.

AT Command Summary (Continuation).

Table 5.

AT Command Summary (Continuation).

Command

Function

Command

Function

+FLO

Flow Control

+FRH=n

Receive Data with HDLC Framing

+FAR=<off/on>

Adaptive reception control

with n protocol

+FCL=<time>

Carrier loss timeout

+FTH=n

Transmit Data with HDLC Framing

+FDD=<value>

Double escape character

with n protocol

replacement control

+FTS=<time>

Wait for silence

+FIT=<time>,<action>

DTE inactivity timeout

+FTS=n

Stop Transmission and Wait

+FPR=<rate>

Fixed DTE Rate

FAST CONNECT COMMANDS

+FMI?

Report Manufacturer ID

$F0

Normal connection (Default)

+FMM?

Report Model ID

$F1,3,4

Not Supported

+FMR?

Report Revisions ID

$F2

V.22 Fast Connect

+FRM=n

Receive Data with n protocol

IDENTIFICATION COMMANDS

+FRS=<time>

Wait for silence

I0

Reports product code

+FTM=n

Transmit Data with n

I3

Reports

firmware

Identification

protocol

code

Figure 5. Schematic Illustrating Implementation of Voice Injection Feature.

 2007 Cermetek Microelectronics, Inc.

Page 17

Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

Table 6. S-Register Summary.

Firmware

Factory

Register

Function

Range

Units

Saved

Defaults

Defaults

S0

Rings to Auto-Answer

0-255

rings

*

000

001

S1

Ring Counter

0-255

rings

000

000

S2

Escape Character

0-255

ASCII

*

043

043

S3

Carriage Return Character

0-127

ASCII

013

013

S4

Line Feed Character

0-127

ASCII

010

010

S5

Backspace Character

0-255

ASCII

008

008

S6

Wait Time before Dial Tone or Blind Dialing

2-255

s

*

002

002

S7

Wait Time for Carrier, Silence or Dial Tone

1-255

s

*

050

050

S8

Pause Time for Dial Delay Modifier

0-255

s

*

002

002

S9

Carrier Detect Response Time

1-255

0.1s

*

006

006

S10

Carrier Loss Disconnect Delay

1-255

0.1s

*

014

014

S11

DTMF Tone Duration

50-255

0.001s

*

095

095

S12

Escape Prompt Delay

0-255

0.02s

*

050

050

S13

Reserved

-

-

000

000

S14

General Bit Mapped Options Status

-

-

*

146 (92H)

146 (92H)

S15

Reserved

-

-

000

000

S16

Test Mode Bit Mapped Options Status (&T)

-

-

000

000

S17

POS Option

-

-

000

000

S19

Reserved

-

-

000

000

S20

Reserved

-

-

000

000

S21

V.24/General Bit Mapped Options Status

-

-

052 (34H)

100 (74H)

S22

Speaker/Results Bit Mapped Options Status

-

-

117 (75H)

117 (75H)

S23

General Bit Mapped Options Status

-

000

000

S24

Sleep Inactivity Timer

0-255

s

000

000

S25

Delay to DTR off

0-255

s or 0.01s

005

005

S26

RTS-to-CTS Delay

0-255

0.01s

001

001

S27

General Bit Mapped Options Status

-

-

073 (49H)

073 (49H)

S28

General Bit Mapped Options Status

-

-

000

000

S29

Flash Dial Modifier

0-255

0.01s

070

070

S30

Disconnect Inactivity Timer

0-255

10s

000

000

S31

General Bit Mapped Options Status

-

-

192 (C0H)

192 (C0H)

S36

LAPM Failure Control

-

-

*

007

007

S37

Line Connection Speed

-

-

000

000

S38

Delay Before Forced Hang-up

0-255

s

020

020

S39

Flow Control Bit Mapped Options Status

-

-

003

003

S40

General Bit Mapped Options Status

-

-

*

104 (68H)

104 (68H)

S41

General Bit Mapped Options Status

-

-

*

195 (C3H)

195 (C3H)

S43-S45

Reserved

-

-

-

-

S46

Data Compression Control

-

-

*

138

138

S48

V.42 Negotiation Control

-

-

007

007

S82

LAPM Break Control

-

-

000

000

S86

Call Failure Reason Code

0-26

-

021

021

S91

PSTN Transmit Attenuation Level

8-15

dBm

11

11

S92

FAX Transmit Attenuation Level

0-15

dBm

10

10

S95

Result Code Messages Control

-

-

*

000

000

S210

V.34 Symbol Rate

0-255

-

13 (0DH)

13 (0DH)

NOTES:

1. Parameters indicated with a (*) in the Saved column may be stored in User Profile n=0, 1 by executing

the appropriate &Wn command.

2. A stored Profile is a subset of allowed parameters and is comprised of those parameters displayed

with the &V command.

3. Factory Default values that are different from the Firmware Default values are highlighted in BOLD .

4. Restore Factory Default values using Zn command.

5. Restore Firmware Default values using &Fn command.

 2007 Cermetek Microelectronics, Inc.

Page 18

Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

Figure 6. PSTN Line Interface for all HS Modems. CH179XA-L/CH2056A-L and CH179XAR-L/CH2056AR-L

models do NOT contain internal Surge Protection (Dashed Box 2). The purchaser MUST provide

external surge protection to maintain conveyed FCC Part 68 approval.

1. Current Limiting PSTN Protection Line Device.

For severe environments, use an external three

Current limiting devices are mandatory to meet UL

terminal device with an earth ground as is shown in

safety standards. To maintain conveyed FCC Part

dashed Box 3.

68 approval, the current limiting components

identified as F1 and F2 in dashed Box 1 must also

4. EMI/RFI Suppression.

survive FCC Part 68 surge testing.

Refer to

Suppression of emitted EMI/RFI is recommended

Cermetek Application Note #126, Supplemental

and is typically required to obtain FCC part 15 A

PSTN Line Protection, for more details. Refer to

and/or B approval. EMI/RFI suppression circuitry is

Application Note # 130, Summary of Recommend

also used to suppress reception of externally

Suppliers, for a list of suppliers and associated part

generated EMI/RFI signals, such as strong radio

numbers.

signals, should the CH1786A be located near a

source of such signals.

Although no external

A resettable/repairable fuse (rated at 0.15 amps) is

EMI/RFI noise suppression circuitry is required to

preferred because it resets automatically upon

maintain

conveyed

FCC

Part

68

approval,

removal of the current flow. Non-resettable devices

additional suppression may be added as described

are also acceptable.

Although CS-03 Part 1

below without adversely affecting FCC Part 68

(Canada) follows the requirements of FCC Part 68

approval.

(USA),

Cermetek

recommends

contacting

a

certified independent lab to verify compliance in the

A. To provide adequate EMI/RFI suppression, the

specific application.

capacitor/inductor network contained in dashed

Box 5 should be located as close to the RJ-11C

2. Over Voltage and Lightning Protection.

Jack as possible. Further, this network should

Surge Protection is provided by internal circuitry

be provided with an excellent ground path to the

contained within all HS modems. No additional

chassis.

external components are required to maintain

conveyed FCC Part 68 approval for all HS modems

B. Capacitors C1 and C2 should not exceed

(excluding

the

CH179XA-L/CH2056A-L

and

0.005 µ f. They must have a rating of 1.5KV and

CH179XAR-L/CH2056AR-L).

typically are 0.001 µ f ± 20%. Inductors L1 and

L2 may be either individual inductors or a dual

For

CH179XA-L/CH2056A-L

and

CH179XAR-

inductor. Refer to Application Note #130 for a

L/CH2056AR-L, the required surge protection

complete list of recommended vendors and

(identified as D1 in dashed Box 2) must be supplied

associated part numbers. For UL applications,

externally. The purchaser must include some form

choose capacitors and inductors that are UL

of surge protection as described herein to maintain

60950 Edition 3 listed. The actual values of the

conveyed FCC Part 68 approval.

Refer to

components used may vary depending on the

Application Note # 130 for a list of suppliers.

end product design and the nature of the EMI/

RFI.

Consult an FCC part 15 consultant if

3. Optional External Over Voltage and Lightning

required.

Protection.

In most environments, the internal two terminal

surge suppressor (see dashed Box 3) is adequate.

 2007 Cermetek Microelectronics, Inc.

Page 19

Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

Table 7A. HS Modem Electrical Specifications VCC = 5V ± 10%, Temp = 0°C to 70°F (unless otherwise stated).

Symbol

Characteristic

Min.

Typ.

Max.

Units

V CC

Positive Supply Voltage

4.5

5.0

5.5

V

I CC Off Hook

Operating Current @

62

mA

V CC = 5.5V when modem is Off Hook

I CC On Hook

Operating Current @

60

mA

V CC = 5.5V when modem is On Hook

I CCSL

Power Current @

22

mA

V CC = 5.5V when modem is in Sleep Mode

I CCZP

Zero Power Current @

2

0.0

mA

V CC = 5.5V when modem is in Zero Power Mode

I RIZP

Current Supplied into RI pin when in Zero Power

Mode @ V CC = 5.5V

2

0.16

mA

1

V IH

High Level Input Voltage

2.0

V

1

V IL

Low Level Input Voltage

0.8

V

VT+

Positive Hysteresis Threshold for RESET Pin

2.5

V

VT-

Negative Hysteresis Threshold for RESET Pin

0.5

V

1

V OH

High Level Output (I OH = 0.5 mA)

2.4

V

1

V OL

Low Level Output (I OL = 1.6 mA)

0.6

V

I IN

Input Leakage Current (TXD, DTR, RTS)

100

µ A

I OH

Input Current (RST)

500

µ A

C p

Capacitive Load (TXD, DTR, RTS)

10

pF

Capacitive Load (RST)

8

pF

Table 7B. HS Modem Electrical Specifications VCC = 3.3V ± 10%, Temp = 0°C to 70°F (unless otherwise

stated).

Symbol

Characteristic

Min.

Typ.

Max.

Units

V CC

Positive Supply Voltage

3.0

3.3

3.6

V

I CC Off Hook

Operating Current @

52

mA

V CC = 3.6V when modem is Off Hook

I CC On Hook

Operating Current @

50

mA

V CC = 3.6V when modem is On Hook

I CCSL

Power Current @

12

mA

V CC = 3.6V when modem is in Sleep Mode

I CCZP

Zero Power Current @

2

0.0

mA

V CC = 3.6V when modem is in Zero Power Mode

I RIZP

Current Supplied into RI pin when in Zero Power

Mode @ V CC = 5.5V

2

0.16

mA

1

V IH

High Level Input Voltage

2.0

V

1

V IL

Low Level Input Voltage

0.8

V

VT+

Positive Hysteresis Threshold for RESET Pin

2.5

V

VT-

Negative Hysteresis Threshold for RESET Pin

0.5

V

1

V OH

High Level Output (I OH = 0.5 mA)

2.4

V

1

V OL

Low Level Output (I OL = 1.6 mA)

0.6

V

I IN

Input Leakage Current (TXD, DTR, RTS)

100

µ A

I OH

Input Current (RST)

500

µ A

C p

Capacitive Load (TXD, DTR, RTS)

10

pF

Capacitive Load (RST)

8

pF

NOTES for Table 7A & 7B

1. Output Load = 50 pF ± one TTL.

2. With recommended 30k ohm external resistor. Maximum resistor range: 10k to 100k ohm.

 2007 Cermetek Microelectronics, Inc.

Page 20

Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

Table 8. HS Modem Electrical Specifications.

Parameter

Min.

Typ.

Max.

Units

Comments

Off Hook Impedance

20

Ohm

Trans Hybrid Loss

25

dB

600 Ohm, RXA, TXA

Ring Voltage Loop

110V

250V

V PP

On 48VDC line voltage for sustained

periods

Line Loop Current – (Off

20

100

mA

Does not apply to CH1799A-L

Hook)

Return loss @ 1000 Hz

15

dB

600 Ohm

Ring Frequencies

40

Hz

Receiver Insertion Gain

-0.5

0.0

+0.5

dB

Transmit Power

-9.5

dBm

600 Ohm – Data Mode

First Character After Reset

3.0

sec

Delay

Inter Character Delay

20

50

msec

Between all command characters

Command Delay

100

200

msec

Between all AT command characters*

Minimum Reset Pulse

10

msec

If user supplied

Duration

Note: Must wait for modem response before issuing a new command.

Table 9. Analog Characteristics.

Name

Type

Characteristic

Value

SPK

O(DF)

Minimum Load

300 Ohms

Maximum Capacitive Load

0.01µf

Output Impedance

10 Ohms

Output Voltage

2.5 ± 1.6V

D.C. Offset

<20mV

Table 10. HS Modem Family Pin Functions.

PACKAGE CONNECTION TABLE

PIN NO.

FUNCTION

PIN NO.

FUNCTION

1

RING

12

NC

2

TIP

13

DTR

3

T1

14

DSR

4

NC

15

RI

5

SPK

16

CTS

6

NC

17

DCD

7

NC

18

NC

8

NC

19

VCC

9

NC

20

GND

10

TXD

21

RST

11

RXD

22

RTS

 2007 Cermetek Microelectronics, Inc.

Page 21

Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

Figure 7A. HS Modem Family Physical Dimensions excluding those products described in Figure 7B.

NOTES:

1. All dimensions are inches.

2. Case dimensions are nominal ± 0.02 inches.

3. Pin length is nominal ± 0.03 inches.

4. Pin dimensions are nominal ± 0.004 inches.

5. Cermetek recommends that 0.040 inch diameter plated through holes are used with 0.060 inch

diameter pads.

6. Pin spacings are nominal ± 0.010 inches.

7. Pin placement to outside case edge is nominal ± 0.100 inches.

Figure 7B. Physical Dimensions ONLY for the CH179XA-B, CH2056A-B, CH179XA-L, CH2056A-L and

CH179XAR-B, CH2056AR-B, CH179XAR-L, CH2056AR-L and extended temperature variations of

listed products.

 2007 Cermetek Microelectronics, Inc.

Page 22

Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

Table 11A. Summary of HS Family Non-RoHS Compliant Modem Products.

Model

Summary of Features

Operating Temperature

CH1794A

Full Function, 14.4kbps, FCC Part 68 Approved, UL 60950

0°C to + 70°C

Listed

CH1794A-B

Full Function, 14.4kbps, FCC Part 68 Approved, UL 60950

0°C to + 70°C

Listed, TBR21 Compliant

CH1794A-C

Full Function with Caller ID (CID), 14.4kbps, FCC Part 68

0°C to + 70°C

Approved, UL 60950 Listed

CH1794A-H

Full Function with Off-Hook Indication (OHI), 14.4kbps, FCC

0°C to + 70°C

Part 68 Approved, UL 60950 Listed, Industry Canada

Registered CS-03 Part I

CH1794A-L

Full Function, 14.4kbps, FCC Part 68 Approved, UL 60950

0°C to + 70°C

Listed, No EEPROM, No Internal Surge Protection

CH1794A-P

Full Function with Zero Power Down, 14.4kbps, FCC Part 68

0°C to + 70°C

Approved, UL 60950 Listed

CH1794A-CP

Full Function with Caller ID (CID) and Zero Power Down,

0°C to + 70°C

14.4kbps, FCC Part 68 Approved, UL 60950 Listed

CH1794A ET

Full Function, 14.4kbps, FCC Part 68 Approved, UL 60950

-40°C to +85°C

Listed

CH1794A ET-B

Full Function, 14.4kbps, FCC Part 68 Approved, UL 60950

-40°C to +85°C

Listed, TBR21 Compliant

CH1794A ET-C

Full Function with Caller ID (CID), 14.4kbps, FCC Part 68

-40°C to +85°C

Approved, UL 60950 Listed

CH1794A ET-H

Full Function with Off-Hook Indication (OHI), 14.4kbps, FCC

-40°C to + 85°C

Part 68 Approved, UL 60950 Listed, Industry Canada

Registered CS-03 Part I

CH1794A ET-P

Full Function with Zero Power Down, 14.4kbps, FCC Part 68

-40°C to +85°C

Approved, UL 60950 Listed

CH1794A ET-CP

Full Function with Caller ID (CID) and Zero Power Down,

-40°C to +85°C

14.4kbps, FCC Part 68 Approved, UL 60950 Listed

CH1799A

Full Function, 33.6kbps, FCC Part 68 Approved, UL 60950

0°C to + 70°C

Listed, Industry Canada Registered CS-03 Part I

CH1799A-B

Full Function, 33.6kbps, FCC Part 68 Approved, UL 60950

0°C to + 70°C

Listed, TBR21 Compliant

CH1799A-C

Full Function with Caller ID (CID), 33.6kbps, FCC Part 68

0°C to + 70°C

Approved, UL 60950 Listed, Industry Canada Registered CS-03

Part I

CH1799A-H

Full Function with Off-Hook Indication (OHI), 33.6kbps, FCC

0°C to + 70°C

Part 68 Approved, UL 60950 Listed, Industry Canada

Registered CS-03 Part I

CH1799A-L

Full Function, 33.6kbps, FCC Part 68 Approved, UL 60950

0°C to + 70°C

Listed, No EEPROM, No Internal Surge Protection

CH1799A-P

Full Function with Zero Power Down, 33.6kbps, FCC Part 68

0°C to + 70°C

Approved, UL 60950 Listed, Industry Canada Registered CS-03

Part I

CH1799A-CP

Full Function with Caller ID (CID) and Zero Power Down,

0°C to + 70°C

33.6kbps, FCC Part 68 Approved, UL 60950 Listed, Industry

Canada Registered CS-03 Part I

 2007 Cermetek Microelectronics, Inc.

Page 23

Document No. 607-0020 Revision B (01/07)

Cermetek Microelectronics, Inc.

CH179XA/2056A High Speed Family of Ultra Small Modems

Table 11A. Summary of HS Family Non-RoHS Compliant Modem Products (Continuation).

Model

Summary of Features

Operating Temperature

CH1799A ET

Full Function, 33.6kbps, FCC Part 68 Approved, UL 60950

-40°C to +85°C

Listed

CH1799A ET-B

Full Function, 33.6kbps, FCC Part 68 Approved, UL 60950

-40°C to +85°C

Listed, TBR21 Compliant

CH1799A ET-C

Full Function with Caller ID (CID), 33.6kbps, FCC Part 68

-40°C to +85°C

Approved, UL 60950 Listed

CH1799A ET-H

Full Function with Off-Hook Indication (OHI), 33.6kbps, FCC

-40°C to + 85°C

Part 68 Approved, UL 60950 Listed, Industry Canada

Registered CS-03 Part I

CH1799A ET-P

Full Function with Zero Power Down, 33.6kbps, FCC Part 68

-40°C to +85°C

Approved, UL 60950 Listed

CH1799A ET-CP

Full Function with Caller ID (CID) and Zero Power Down,

-40°C to +85°C

33.6kbps, FCC Part 68 Approved, UL 60950 Listed

CH2056A

Full Function, 56.0kbps, FCC Part 68 Approved, UL 60950

0°C to + 70°C

Listed

CH2056A-B

Full Function, 56.0kbps, FCC Part 68 Approved, UL 60950

0°C to + 70°C

Listed, TBR21 Compliant

CH2056A-C

Full Function with Caller ID (CID), 56.0kbps, FCC Part 68

0°C to + 70°C

Approved, UL 60950 Listed

CH2056A-H

Full Function with Off-Hook Indication (OHI), 56.0kbps, FCC

0°C to + 70°C

Part 68 Approved, UL 60950 Listed, Industry Canada

Registered CS-03 Part I

CH2056A-L

Full Function, 56.0kbps, FCC Part 68 Approved, UL 60950

0°C to + 70°C

Listed, No EEPROM, No Internal Surge Protection

CH2056A-P

Full Function with Zero Power Down, 56.0kbps, FCC Part 68

0°C to + 70°C

Approved, UL 60950 Listed

CH2056A-CP

Full Function with Caller ID (CID) and Zero Power Down,

0°C to + 70°C

56.0kbps, FCC Part 68 Approved, UL 60950 Listed

CH2056A ET

Full Function, 56.0kbps, FCC Part 68 Approved, UL 60950

-40°C to +85°C

Listed

CH2056A ET-B

Full Function, 56.0kbps, FCC Part 68 Approved, UL 60950

-40°C to +85°C

Listed, TBR21 Compliant

CH2056A ET-C

Full Function with Caller ID (CID), 56.0kbps, FCC Part 68

-40°C to +85°C

Approved, UL 60950 Listed

CH2056A ET-H

Full Function with Off-Hook Indication (OHI), 56.0kbps, FCC

-40°C to +85°C

Part 68 Approved, UL 60950 Listed, Industry Canada

Registered CS-03 Part I

CH2056A ET-P

Full Function with Zero Power Down, 56.0kbps, FCC Part 68

-40°C to +85°C

Approved, UL 60950 Listed

CH2056A ET-CP

Full Function with Caller ID (CID) and Zero Power Down,

-40°C to +85°C

56.0kbps, FCC Part 68 Approved, UL 60950 Listed

 2007 Cermetek Microelectronics, Inc.