HIGH SPEED INTERNET MODEM FAMILY
CH2165
-
Send/Retrieve Email. Unlimited Email, V.90
FEATURES
INTRODUCTION
Direct machine-to-machine interaction represents the
wide web for communication.
next logical extension of the internet. Cermetek internet
modem (iModem) products are designed to exploit the
Protocol (PPP), Password Authentication Protocol
internet to facilitate the utilization of machine-to-
(PAP) and Challenge Authentication Protocol
machine interactions.
Using email, information can
(CHAP) to connect to the Internet.
easily be transferred between systems and can be
transmitted/retrieved at will. Internet email provides low
cost,
near
real
time
multi-path
communication.
and POP3 to retrieve and/or delete emails.
Replacing conventional modems and long distance
telephone lines with local access internet connections
or pre-stored email up to 100K bytes in RAM.
reduces fixed asset and maintenance costs, limits
communication expenses and saves money.
messages.
retrieve and/or delete email.
USER FRIENDLY INTERFACE LAYER
All Cermetek iModem products contain a user friendly
interface layer that provides the user transparent
access to the internet. This interface layer, consisting
remote device.
of various @T ® macro commands, has the look and feel
of conventional modem AT commands. With the @T
®
V.22bis, V.22A/B V.23, V.21, Bell 212A and 103,
macro commands the user can direct the iModem to
(depending on model) and can be used in
compose, edit/modify, send, retrieve and delete email
conventional modem mode.
messages. Internet and email activity status is reported
via the iModem’s V.24 (EIA 232-E) serial interface.
sensing, flow control and data buffers.
COMPARISON OF CH21XX iMODEM DEVICES
The CH2165 represents the next generation in internet
enabled devices. This product provides the user with
unsurpassed command and control capabilities. The
CH2165 communicates asynchronously with the host
controller (via the serial port) and the internet (via the
peak surge protection.
PSTN connection) simultaneously . Consequently, the
user can intersperse CH2165 specific management
reference UL File E104957.
commands
with
internet
commands.
Further,
commands can be queued. The CH2165 will also send
03 Part I approvable.
or retrieve email messages of virtually unlimited length
by using streaming email techniques. The CH2165 is
ideal for applications where larger data transfers are
family and modem CH179X/2056 family.
required and/or where large amounts of data must be
stored locally on the iModem device.
The CH2124/60 products are the first generation
ISP.
internet enabled devices.
These products excel at
sending and retrieving modest amounts of data. Email
messages of approximately 125 ASCII characters in
local access numbers world wide.
length can be stored in internal Flash ROM for later
transmission.
ISP provided with each iModem.
The CH2124/60 products are ideal for very low cost
controller applications and in applications where limited
data transfer is required.
2005 Cermetek Microelectronics, Inc.
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Document No. 607-0017-01 Revision A (05/05)
Cermetek Microelectronics, Inc.
High Speed Internet Modem Family
CH21XX
iModem
Internet
Product
(PPP, SMTP, TCP/IP,
Family
POP3)
Message/Input Port Status
User Supplied Parameters
Functions Performed
Figure 1.
Conceptualized Block Diagram illustrating the Cermetek CH21XX iModem product family
performing the embedded internet application function.
OVERVIEW OF THE CH21XX iMODEM
termination sequence for pre-stored messages is the
A conceptual representation of the iModem in an
CTRL D characters.
embedded environment is presented in Figure 1. As
can be seen in this figure, the iModem requires the
The total CH2165 RAM memory available to the user is
input of various internet parameters to function
approximately 100K bytes. For messages that need to
properly: user name, user ID, user password, ISP
be stored semi-permanently, the user has access of up
telephone number, ISP mail server address/name, local
to 100K byte of Flash ROM for message storage.
email address/name, destination email address and
Messages stored in ROM can also be sent when
user specified email message/input port status.
needed.
Cermetek’s iModem products provide the user with the
When retrieving emails, the user continues to save the
ability to assign a unique unit name to each iModem
data streaming out of the CH2165’s serial port until a
thereby creating a customized identity for each system
<CR>.<CR> is received.
containing an iModem product.
Refer to Cermetek Application Note # 325, @T
®
Each
iModem
device
stores
the
user-supplied
Command Set Description and Usage For CH2165
parameters in internal memory. These parameters are
iModem, for more details.
retained when power is removed. The user supplied
parameters are loaded into the iModem via the
iModem Hardware Configuration.
Each CH2165
iModem’s serial interface port utilizing a variety of
iModem contains a fully functional 56kbps modem and
commercially available terminal emulation software
the hardware and firmware needed to provide the
packages (such as HyperTerminal).
internet capability. Because of the unique architecture
of Cermetek iModems, these iModems have the ability
Internet Connectivity. The CH21XX iModem uses the
to operate as either an internet email transceiver or as
user supplied parameters to establish an internet
a high reliability analog modem.
Additionally, the
connection and then send, retrieve and/or delete email.
CH2165 supports user remote access via the internet
After completion of the required internet activities, the
which can be used to reprogram or reconfigure an
iModem terminates the internet connection.
iModem deployed in the field.
Send, Retrieve and Delete Email. The CH2165 has
The iModem Family of products are pin compatible with
the ability to send and retrieve emails of virtually
the CH179X and CH2056 modem products. Referring
unlimited length by employing a technique referred to
to Figure 2, the CH21XX iModem Family consists of an
as streaming email. Once in streaming email mode, the
industrial grade high speed modem module and a µP
user simply continues to supply data to the CH2165’s
controller with associated internal logic.
The µP
serial port, and terminates the data stream with a
controller and the logic provide all the functions
<CR>.<CR> . Alternatively, messages of finite length
required for internet communication via standard PSTN
can pre-stored locally on the CH2165 in RAM memory
telephones lines. The CH2165 contains an additional 8
and then sent when needed.
The data stream
Mbytes of RAM and 2 Mbytes of Flash ROM.
All
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High Speed Internet Modem Family
CH21XX iModem products utilize TCP/IP, PPP, PAP,
email. PSTN dial-up, logon, authentication and email
CHAP, SMTP and POP3 internet protocols.
transmission, retrieval, and/or deletion are performed
automatically by the iModem in the same fashion as for
Required External Connections.
The iModem
the Fully Autonomous On-Demand control method
requires an external RJ-11C jack for the PSTN line
described above.
connection. An ITU-T V.24 serial interface is required
when host processor control of the iModem is required
Host Supervised Control. This method is the most
in the specific application.
All retrieved emails are
flexible, but requires issuance by the host processor of
the necessary @T commands in the required order
®
presented to the host system for further processing
and/or retention via the serial interface.
from the host processor.
When choosing an
implementation scheme utilizing a host processor, the
host controls the iModem by using Cermetek @T
®
Approvals. The CH21XX iModem Family is FCC Part
68 approved, UL 1950 and CSA C22.2 950 (Third
commands.
These commands are similar to the
Edition) listed and Industry Canada CS-03 approvable.
standard Hayes AT command set.
Physical Dimensions. The modules are designed for
Although the DTE serial port is required to be
PCB through-hole mounting and are 1.35” x 1.97” x
operational for this method of control, an additional
0.55” in size.
feature of this method is the ability of the host to over-
ride the preprogrammed parameters (including the
email message content) by simply entering the
applicable information using the appropriate @T
®
iMODEM EVALUATION BOARD
Cermetek manufactures a companion evaluation board
Command.
that is designed to simplify the hardware connections
required to program the iModem as well as providing a
Send Email. To send email messages, the user must
reliable platform to assist with system level debugging.
explicitly open the TCP socket connection using the
Contact Cermetek and ask for the CH21XX iModem
@TCP command. This command automatically dials
Evaluation Board.
the specified local access POP phone number,
performs user authentication, establishes a PPP
connection and obtains an IP address.
iMODEM CONTROL METHODOLOGIES
The CH2165 iModem receives @T commands from
®
Once connected to the internet, the user may use one
the host processor and proceeds to dial up the local
of two methods to send email messages: use pre-
POP, log on to the internet, authenticate and verify the
stored messages contained in resident memory or use
user ID and password, and either sends or retrieves
streaming messages obtained in real-time from the
email depending on the command received. See Table
CH2165’s DTE serial I/O port. In either case, multiple
1 for a summary of available @T commands.
®
email destination addresses are allowed.
The CH2165 offers a variety of internet communication
For the case of pre-stored messages, each message is
features ranging from simple one command email
associated with a user defined message name. The
transmission to full send and retrieve email capability.
user enters the @TD=msgname command (where
User Control of the internet communication activity of
msgname is the message file name) and the CH2165
the iModem device typically falls into one of the
sends the email using the SMTP protocol.
following basic control strategies:
1. Semiautonomous control, requiring one command to
For the case of streaming email, the user enters the
be issued from the host processor. A pre-stored
@TD=0 command (where 0 is a reserved name and
message is sent on command.
signals the CH2165 that streaming email is desired).
2. Complete host intervention and supervision requiring
The CH2165 then sends the appropriate SMTP email
each command to be issued from the host.
headers and prompts the user to supply the body of the
Message is constructed and sent in real time.
message.
The user presents as many ASCII
characters as desired to the CH2165’s DTE serial port.
Semi-Autonomous Control. This method requires a
When finished, the user must end the streaming input
minimal amount of host processor intervention and
with a <CR>.<CR> . The CH2165 will then terminate
requires that the DTE serial port be operational. Semi-
the SMTP message and close the SMTP connection. If
autonomous control is a special case of full Host
the SMTP inactivity timer limit is exceeded (currently
Supervised Control and relies on the preprogrammed
set at 90 seconds), the CH2165 will automatically
default internet configuration profile contained within the
terminate
the
message
and
close
the
SMTP
iModem. Initiation of an email activity occurs with the
connection. To end the internet session, the user must
issuance by the host processor to the iModem the
explicitly close the TCP connection and terminate the
appropriate @T
®
command to send/retrieve/delete
PSTN dial-up phone call by entering the @TCT
command.
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High Speed Internet Modem Family
Network
Flash ROM
µP
Protocol
2Mx8
POP 3
SMTP
Flash ROM
TCP
32Kx8
IP
RAM
PPP
8Mx8
CH2165
MODEM
RXD
TIP
RTS
SERIAL
V.90
DAA
DCD INTERFACE
PSTN
DSR
V-24
Ring
RI
EIA-232-E or
CTS
UART
TXD
DTR
MODEM INTERFACE
RST
SPK
+5V
GND
Figure 2. Functional Block Diagram of Cermetek CH2165 iModem Products.
When using pre-stored messages in resident memory,
iModem to send four successive PING commands
the
user
is
responsible
for
message
memory
directly to the internet host. Responses from the host
management and utilization. Exceeding the memory
include Host IP address and connectivity information.
limits will cause memory wrap around and messages
may become lost or corrupted.
Back-up and Alternative POP access Phone
Numbers. Cermetek iModem products allow usage of
Retrieve Email. The CH2165 will retrieve email from
an alternative local access POP phone number or, if
POP3 servers complying with applicable internet
available, a 1-800 number, should the iModem fail to
governing RFCs. By executing the @TES command,
connect to the primary POP. The user can establish
the user may obtain an inventory listing containing
the number of attempts made to the primary POP
Subject Line and Message Number of all messages
before the back up POP is attempted.
currently cached on the POP3 server. The user may
selectively down load individual messages (by message
number) or may retrieve all messages on the server.
DESCRIPTION OF FUNCTIONAL BLOCKS AND
Messages retrieved are provided to the user on the
DISCUSSION OF BASIC OPERATIONS
iModem’s serial port and are not stored in CH2165
Each CH2165 iModem product consists of the following
resident memory.
functional blocks:
1. µP controller with Network Protocols and Flash
Delete Email. The user may selectively delete any
ROM.
email message (by message number) or all messages
2. Serial interface buffer.
cached on the POP3 server.
3. Input/Output interface circuitry.
4. V.90 Internal modem.
Email and Internet Activity Status. Currently, the
5. Modem interface circuitry.
CH2165 provides two levels of internet and email status
6. DAA (Data Access Arrangement) PSTN interface.
information. Using the @TCS=PPP command, the user
7. Additional Flash ROM.
can monitor all the internet PPP communication.
8. Additional RAM.
Additionally,
the
user
can
determine
internet
connectivity status by issuing the @TCS=PING
command.
The @TCS=PING command causes the
2005 Cermetek Microelectronics, Inc.
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High Speed Internet Modem Family
Figure 2 contains a schematic drawing illustrating the
interconnectivity of the various functional blocks
CH21XX DTE Speed. AS DELIVERED FROM THE
comprising the CH2165 iModem products.
FACTORY, the CH2165 iModem will only communicate
with the DTE at 19.2 kbps. However, the user may
modify the DTE speed with the appropriate @T
®
Each
iModem
performs
the
following
internet
commands. Application Note # 325, @T Command
®
connectivity functions automatically:
1. Dials local POP and Connects to ISP.
Set Description and Usage For CH2165. When the
2. Authenticates user ID and logs onto the internet.
user changes the DTE communication speed to any
3. Sends (or Retrieves) email to (from) the server
speed other than the default value set of the factory, the
address/name specified using the ISP’s SMTP
user must ensure that the DTE supports the speed
(POP3) Mail Server.
selected.
Failure to do so could adversely affect
4. Leaves ISP session active after all data is sent until
communication with the iModem device or, worst-case,
terminated by user.
disable communication with the internal µP controller.
Refer to Application Note # 158, Cermetek iModem
Control of the internet capabilities of the iModem are
Caveats and Definitions, for a more detailed discussion
initiated and controlled by a system level host
of this issue.
processor. Refer to Table 2 for a complete set of pin
descriptions.
Refer to Cermetek’s High Speed Modem and FAX
Family product data sheet for a complete Description of
When not utilized in the internet connectivity role, the
the internal modem’s capabilities and functions.
iModem will function as a standard analog modem.
Serial Host Interface Buffer. The iModem utilizes a
KEY FEATURE
serial V.24 EIA 232-E 5V interface to communicate with
The user has complete control of the level of
the internal modem and to communicate with the
autonomy the iModem exercises in the user’s
internal µP.
application. This is a unique feature of Cermetek’s
iModem products.
Telephone Line Interface or DAA.
The iModem
family includes a unique low distortion DAA designed
µP Controller. The µP controller performs the required
for optimal performance over all PSTN line conditions
internet operations by interpreting each specific @T
®
thereby
achieving
the
most
reliable
and
best
command and executing the appropriate internet
performance PSTN connections.
commands. The necessary internet protocol firmware
is resident in flash ROM. The @T commands function
®
The CH2165 iModem is designed to meet North
as an extension to the industry standard Hayes AT
American telephone standards as set by FCC Part 68
command set.
(USA) and Industry Canada CS-03 Part I (Canada).
Each iModem product is shipped from the factory with
Internal Modem.
The internal modem is used to
an FCC label indicating the FCC registration number
establish a data connection with the ISP. The CH2165
and ringer equivalent.
The PSTN line interface is
contains a V.90 internal modem. The internal modem
UL1950 and CSA listed. Consequently, the iModem
can be controlled with Hayes AT commands and is
family of products satisfies U.S. and Canadian
compatible with industry standard communication
requirements, and will meet other international approval
software.
Refer
to
Cermetek
publication,
AT
agency requirements that specify these levels of
Commands and S-Registers, for a more detailed
isolation.
discussion of the Hayes AT commands supported by
the iModem product family.
IMPORTANT NOTICE
If
the
user
wants
to change the DTE/Host
When operating in standard analog modem mode, the
communication speed to any speed other than the
maximum Data Terminal Equipment (DTE)/Host system
factory set speed of 19.2kbps for the CH2165, the
communication speed is established by the maximum
user must first change the DTE speed of the iModem
using the appropriate all @T
®
speed available from the DTE/Host and is not limited by
commands before
the iModem product.
changing the DTE/Host speed. Refer to Application
Note # 158, Cermetek iModem Caveats and
IMPORTANT NOTICE
Definitions, for a more detailed discussion of this
®
AS DELIVERED FROM THE FACTORY, all @T
issue.
command
communication
between
the
CH2165
iModem and the host processor is conducted over the
serial interface at 19.2kbps.
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High Speed Internet Modem Family
Table 1. Summary of Available @T ® Commands By Category for CH2165.
Command
Query
Description
Email Message Management
@T [ MC ][ =n ]
@T [ MC ][ ?=n ]
Enter email message where n is the email message name. Message name must not
exceed 8 alphanumeric characters and cannot begin with a number or contain any
non-alphanumeric characters. Message length is limited to 100K bytes per message.
All valid ASCIII characters allowed within the message. Use the <cntrl d> ASCII
character to terminate message entry. Message is maintained in dynamic RAM until
stored in Static memory using the @TW command.
@T [ MD ][ =n ]
-----
Delete filename, n , from Cache RAM and Static memory.
@T [ MS ][ =n ]
-----
Store filename, n , in Cache RAM memory. Files stored in Cache RAM memory will
be lost when power is removed. Delete filename, n , from RAM memory.
-----
@T [ ML ][ ?=n ] Displays file name and size of all temporary (i.e., RAM memory) files and all stati c
(i.e., FLASH memory) files stored on the CH2165. Allowable values:
s.
Only STATIC memory files displayed.
t.
Only RAM memory files displayed.
null (i.e., not specified).
All file types displayed.
Password
@T [ PI ][= n ]
@T [ PI ][ ? ]
Set ISP Login password, n .
@T [ PM ][= n ]
@T [ PM ][ ? ]
Set POP3 email retrieve password, n .
Username
@T [ UI ][= n ]
@T [ UI ][ ? ]
Set ISP Login username, n .
@T [ UM ][= n ]
@T [ UM ][ ? ]
Set POP3 email retrieve username, n .
POP3 Retrieval
@T [ ED ][= n ]
-----
Delete email message(s). Allowable values:
n.
Message number n deleted.
n-m.
Message numbers n-m (inclusive) deleted.
@T [ EO ][]
-----
Open POP3 mailbox.
@T [ EQ ][]
-----
Quit POP3 mailbox activity and close POP3 server.
@T [ ER ][= n ]
-----
Retrieve message number, n .
@T [ ES ][]
-----
Inventory all messages currently on POP3 server and list message number and
subject line.
CH2165 Firmware Revision
-----
@T [ I ][ ? ]
Display firmware revision
Send Email Message
@T [ D ][ =n ]
-----
Send email message, n .
Use internet TO, FROM, REPLY, and ERROR TO
addresses contained within message n . Use the POP dialup phone number currently
active.
@T [ D ][ =0 ]
-----
Send streaming email message.
Use specified SMTP server address and open
server socket connection. Use current internet TO, FROM, REPLY, and ERROR TO
addresses for message and TCP/IP headers. Enter Streaming Email data entry
mode. Each line of data entered is echoed back. Terminate data entry using the
<cntrl d> ASCII character. Message completed and sent and the SMTP socket
closed upon receipt of the <cntrl d> ASCII character.
POP Access Dialup Phone Number
@T [ N ][= n ]
@T [ N ][ ? ]
Set POP dialup access dial-up phone number string, n .
Special characters
supported:
Each comma will cause a 2 second delay.
Use a dash as a delimiter. Dashes are ignored.
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High Speed Internet Modem Family
Table 1. Summary of Available @T ® Commands By Category for CH2165 (continued).
Command
Query
Description
DCE and DTE Attributes
@T [ BC ][ =n ]
@T [ BC ][ ? ]
Select DCE Baud rate, n . Allowable values:
n=57600 .
n=38400 .
n=19200 .
n=9600 .
n=4800 .
n=2400 .
By default, if no value is specified, the CH2165 will automatically determine the
maximum baud rate supported by the PSTN connection. This is referred to as auto-
bauding.
The @TBC command is currently NOT ENABLED.
The CH2165 will
autobaud.
@T [ BT ][ =n ]
@T [ BT ][ ? ]
Select DTE Baud rate, n . Allowable values:
n=57600 .
n=38400 .
n=19200 . (Default).
n=9600 .
n=4800 .
n=2400 .
The @TBT command currently NOT ENABLED.
@T [ BE ][ =n ]
@T [ BE ][ ? ]
Toggle DTE echo.
n=on Enable DTE echo (default).
n=off Disable DTE echo.
The @TBE command is currently ENABLED by the query function, @TBE? , is
currently DISABLED.
Email Addresses, Device Name and Email Subject Line
@T [ AD ][ =n ]
@T [ A ][ ? ]
Set email DESTINATION address, n . This is the address to which the email will be
sent. This is the address that appears in the TCP/IP header.
@T [ AE ][ =n ]
@T [ A ][ ? ]
Set email ERROR address, n . This is the address to which reply emails will be sent
when an email delivery error is encountered by the SMTP server. This address
becomes the DESTINATION address of the Error Email and appears in the TCP/IP
header.
@T [ AF ][ =n ]
@T [ A ][ ? ]
Set email FROM: address, n . This is the address that follows the FROM: located in
the body of the email message. The FROM address is the address used by the
POP3 server to retrieve email. By convention, the FROM: address matches the email
sender’s address. However, this is not required for proper delivery of the email
message. This address appears in the TCP/IP header.
@T [ AR ][ =n ]
@T [ A ][ ? ]
Set email REPLY address, n . This is the address to which reply emails will be sent
when the Email Reply button is selected. This address becomes the DESTINATION
address and appears in the TCP/IP header.
@T [ AS ][ =n ]
@T [ A ][ ? ]
Set email SUBJECT LINE, n . This is the subject line that appears in the email
message.
@T [ AT ][ =n ]
@T [ A ][ ? ]
Set email TO: address, n . This is the address that follows the TO: located in the body
of the email message. By convention, the TO: address matches the DESTINATION.
However, this is not required for proper delivery of the email message.
@T [ T ][ =n ]
@T [ T ][ ? ]
Set Device or Unit Name. This is the name that appears on the email TO: line before
the email TO: address. The iModem.net ISP uses the Device Name in combination
with the device Serial number to verify identity.
Display All Parameters
@T [ V ][ =n ]
@T [ V ][ ? ]
Toggle internet SMTP and POP3 command responses.
n=0 Disable Verbose command response. @TV? returns off .
n=1 Enable Verbose command response (default). @TV? returns on .
-----
@T [ W ][ ? ]
Display all iModem parameters.
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High Speed Internet Modem Family
Table 1. Summary of Available @T ® Commands By Category for CH2165 (continued).
Command
Query
Description
Static RAM Memory Management
@T [ W ][ =flash ]
-----
Store all files and Configuration Profile changes currently in Cache RAM to Flash
memory. Files stored in Flash memory will be retained when power is removed.
Help Topics
-----
@T [ H ][ ?=n ]
Displays details for specified command, n , and provides an example of command
usage. See supported commands below.
-----
@T [ H ][ ? ]
Displays all supported commands. Currently:
A Display Addresses and Subject Line command description syntax.
C Display PPP connectivity command syntax.
D Display send email command syntax.
This Help feature currently NOT
IMPLEMENTED.
E Display retrieve email command syntax.
This Help feature currently NOT
IMPLEMENTED.
I Display IMAP and POP3 email command syntax.
M Display create or view email message command syntax.
N Display local POP access phone number command syntax.
P Display password command syntax.
S Display mail/SMTP server command syntax.
U Display username command syntax.
This Help feature currently NOT
IMPLEMENTED.
V Display verbose command syntax.
Z Display factory default parameter restore command syntax.
Server Addresses
@T [ SS ][ =n ]
@T [ S ][ ? ]
Set SMTP server symbolic name, n . This symbolic name is used by the CH2165 to
determine the SMTP server address.
@T [ SM ][ =n ]
@T [ S ][ ? ]
Set POP3 server symbolic name, n . This symbolic name is used by the CH2165 to
determine the POP3 server address.
Internet Connectivity Status
@T [ CS ][ =PPP ]
-----
Displays all PPP connectivity information, including iModem’s dynamic IP address.
@T [ CS ][ =PING ]
-----
Sends four successive ping commands to the imodem.net ISP server.
TCP Management
@T [ CP ][]
-----
Establish TCP connection.
This command causes the CH2165 to perform the
following tasks in the order listed:
1. Go Off-Hook and dial POP phone number specified @TN=n command.
2. Connect to internet using Login ISP Username specified by @TUI command and
ISP Login Password specified by @TPI command.
3. Obtain IP address and establish TCP socket connection.
@T [ CT ][]
-----
Terminate TCP connection.
This command causes the CH2165 to perform the
following tasks in the order listed:
1. Close TCP socket connection.
2. Disconnect from the internet.
3. Go On-Hook.
Factory Defaults
@T [ Z ][]
@T [ Z ][ ? ]
Restores the factory default parameter values. Factory defaults are “as programmed
by the factory” parameters and are based on customer supplied information. All
parameters have factory default values EXCEPT the email message body. These
parameters are not user modifiable.
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Cermetek Microelectronics, Inc.
High Speed Internet Modem Family
Table 1. Summary of Available @T ® Commands By Category for CH2165 (continued).
Command
Query
Description
Analog Modem Operation
~..
-----
Used to initiate and terminate analog modem operation. When operating as an
analog modem, all supported Hayes AT commands can be executed.
All @T
commands are non-functional while the CH2165 is operating as an analog modem.
+++
-----
When operating as an analog modem, used to change from Data Entry to Command
Mode. The +++ must be on a line by itself.
Pins 1 and 2 function as both input and output
8.
The product’s User Manual must provide the user
connections to the PSTN. To maximize field reliability
with instructions for connection and use as
in hostile environments, to ensure UL compliance, and
recommended in the FCC Registration Section
also optionally for FCC part 15 compliance, these two
below.
pins may be routed through an external network such
as that briefly described in figure 3 or as described in
more detail in Cermetek Application Note # 126,
CANADIAN APPROVALS
Supplemental PSTN Line Protection.
The iModem family is approvable for use by DOT to
CSA CS-03 Part I.
However, per Canadian
procedures, approval can only be granted after the
PHONE LINE CONNECTION GUIDELINES
iModem has been installed into the end product.
1.
The iModem must be mounted in the final
Typically, Canadian approval is obtained by submitting
assembly such that it is isolated from exposure to
the final end product to an independent test house or
any hazardous voltages within the assembly.
consultant for evaluation. The test house/consultant
Adequate separation and restraint of cables and
then forwards the test results and applicable
cords must be provided.
documents to the regulatory agency. Cermetek offers
a list of consultants to assist with this process.
The circuitry from the iModem to the telephone
interface must be provided in wiring that carries
no other circuitry other than
that
specifically
iMODEM HANDLING AND ASSEMBLY
allowed in the FCC rules (such as A and A1
RECOMMENDATIONS
leads).
The iModem contains static-sensitive components and
should only be handled by personnel and in areas that
2.
Connection to the PSTN line should be made
are properly protected against static discharge.
through an RJ-11C jack.
3.
PCB traces from the iModem’s RING and TIP
There
are
two
mounting
techniques
that
are
pins to the RJ-11C jack must be 0.1 inch spacing
recommended for physically connecting the iModem to
or greater to one another and 0.2 inch spacing or
a PCB:
greater to all other traces.
The traces should
1. Direct soldering.
have a nominal width of 0.020 inches or greater.
2. Sockets.
4.
The RING and TIP PCB traces should be as
Direct Soldering.
The iModem may be wave
short as possible and oriented to prevent
soldered onto a circuit card. All iModem products are
coupling with other high speed or high frequency
sealed and will not be harmed by industry standard
signals present on the host circuit PCB.
wave soldering processes.
Socketing.
The socket approach to mounting
5.
No additional circuitry other than that shown in
eliminates cleaning and desoldering concerns. When
Figure 3 may be connected between the iModem
the socket is used, it must make a solid connection to
module and the RJ-11C jack.
Doing so will
all pins.
Failure to do so will cause unreliable or
invalidate the conveyed FCC approval.
intermittent operation. Also, steps should be taken to
assure that the module remains tightly seated in the
6.
The iModem, the RJ-11C jack, the interfacing
socket after the end product is shipped. Cermetek
circuitry and all PCB traces must be contained on
recommends the 50 pin strip socket CES-150-01-T-S
a PCB with a 94 V-0 flammability rating.
by Samtec. Refer to Application Note# 130, Summary
of Recommend Supplies, for a list of supplies and
7.
The supplied FCC registration label must be
associated contact information.
applied visibly on the outside of the product.
2005 Cermetek Microelectronics, Inc.
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Document No. 607-0017-01 Revision A (05/05)
Cermetek Microelectronics, Inc.
High Speed Internet Modem Family
FCC REGISTRATION
Telephone Company Procedure: The goal of the
All CH2165 iModem products are registered with the
telephone company is to provide the best service it
FCC under Part 68. To maintain the validity of the
can.
In order to do this, it may occasionally be
registration, notice of the restrictions the FCC places
necessary for the telephone company to make
on the iModem and its use must be served to the end
changes to their equipment, operations or procedures.
user of the product containing the iModem.
If these changes might affect service provided to the
users or the operation of the user’s equipment, the
In addition to restriction notification, the FCC requires
telephone company will give the user notice, in writing,
that Cermetek make all repairs to all products in the
to allow the users to make any changes necessary to
iModem family.
If repairs are necessary after
maintain uninterrupted service.
installation of the iModem and the end product has
been delivered to the end user, the end product must
In certain circumstances, it may be necessary for the
be returned to the end product supplier where the
telephone company to request information from the
iModem can be removed and then forwarded to
users concerning the equipment which the user has
Cermetek for repair.
The following notice is
connected to the telephone line. Upon request of the
recommended and should be included in the end
telephone company, provide the FCC registration
product’s user manual.
number and the ringer equivalence number (REN);
both of these items are listed on the equipment label.
The sum of all of the REN’s on the user’s telephone
FOR YOUR USER’S MANUAL
lines should be less than five in order to assure proper
The Part 68 rules require the following (or equivalent)
service from the telephone company. In some cases,
be provided to the end user of the equipment
a sum of five may not be useable on a given line.
containing an iModem device.
Consult your telephone provider.
Type of Service: The (insert end product name) is
If Problems Arise: If any of the user’s telephone
designed to be used on standard device telephone
equipment is not operating properly, the user should
lines. It connects to the telephone line by means of a
immediately remove it from the user telephone line, as
standard jack called the USOC RJ-11C (or USOC
it may cause harm to the telephone network. If the
RJ45S). Connection to telephone-company-provided
telephone company notes a problem, they may
coin service (central office implemented systems) is
temporarily discontinue service. When practical, they
prohibited. Connection to party lines service is subject
will notify the user in advance of this disconnection. If
to state tariffs.
advance notice is not feasible, the user will be notified
as soon as possible.
Changes in Attestation Procedure for Plugs and
Jacks: (Name of applicant) attests that the network
When the user is notified, the user will be given the
interface plugs or jacks used on this equipment comply
opportunity to correct the problem and informed of
with and will continue to comply with the mechanical
their right to file a complaint with the FCC. Contact the
requirements specified in Part 68, Sub-part F,
local telephone service provider if any questions arise
specifically the dimensions, tolerances and metallic
concerning the telephone service.
plating requirements.
The compliance of these
connectors will be assured by purchase specifications
In the event repairs are ever needed on the (insert
and incoming inspection.
Documentation of such
your product name), they should be performed by
specifications and/or inspections will be provided by
(insert your company name), or an authorized
the FCC within 30 days of their request for the same.
representative or (insert your company name). For
information contact: (insert your company address).
2005 Cermetek Microelectronics, Inc.
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Document No. 607-0017-01 Revision A (05/05)
Cermetek Microelectronics, Inc.
High Speed Internet Modem Family
Table 2. iModem Family Pin Description.
PIN
NAME
I/O
FUNCTION
Directly connects to the telephone line’s Ring lead through a user supplied RJ-11C jack.
1
RING
I/O
Directly connects to the telephone line’s TIP lead through a user supplied RJ-11C jack.
2
TIP
I/O
NO CONECTION
3
NC
---
NO CONECTION
4
NC
---
SPEAKER. Audio output for speaker. See speaker control diagram.
5
SPK
O
SEND EMAIL. Not Currently Supported. No Connect.
6
SEND
I
Input. Not Currently Supported. No Connect.
7
IN 1
I
EMAIL SENT. Not Currently Supported. No Connect.
8
SENT
O
Input. Not Currently Supported. No Connect.
9
IN 2
I
TRANSMIT DATA. Serial transmit data input. Marking, or a binary 1 condition is indicated
10
TXD
I
by a HIGH.
RECEIVE DATA. Serial Receive data output. Received marking or a binary 1 condition is
11
RXD
O
indicated by a HIGH.
NO CONECTION
12
NC
---
DATA TERMINAL READY INPUT. Active LOW. Switching off DTR can either return
13
DTR
I
modem to command state, disconnect phone call, or reset modem. DTR should be set
LOW when not in use.
DATA SET READY. LOW indicates handshaking with a remote modem in progress,
14
DSR
O
and/or the data carrier of a remote modem has been detected.
RING INDICATION. This signal follows the frequency of the ringing signal and is normally
15
RI
O
about 20 to 40 Hz for 2 seconds on with 4 second off.
CLEAR-TO-SEND. Output always LOW. Reserved for flow controls with FAX option. Not
16
CTS
O
active, let float.
DATA CARRIER DETECT. LOW indicates a data carrier from a remote modem has been
17
DCD
O
detected. Must enable with AT&C1 Hayes command.
NO CONECTION
18
NC
---
DC SUPPLY. 5V ± 5% required.
19
VCC
---
GROUND. Note: Noise should be less than 25mV peak to peak.
20
GND
---
RESET. Active HIGH. This input must be asserted HIGH for at least 10ms to reset the
21
RST
I
modem. RESET is then returned to LOW for normal operation. If no system reset is
available, let this pin float to enable internal reset.
REQUEST TO SEND. Active Low. Used for flow control. Should be tied Low when using
22
RTS
I
SEND pin and when using @T commands for CH2160 only. DO NOT CONNECT for
CH2124.
2005 Cermetek Microelectronics, Inc.
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Document No. 607-0017-01 Revision A (05/05)
Cermetek Microelectronics, Inc.
High Speed Internet Modem Family
Figure 3. PSTN Line Interface for all iNet Appliance Products.
1. Currently Limiting PSTN Protection Line
2. Over Voltage and Lightning Protection.
Device.
A. Surge Protection is provided by internal
Currently limiting devices are mandatory to meet
circuitry (see Figure 3). No additional external
UL safety standards. To maintain conveyed FCC
components
are
required
to
maintain
Part 68 approval, the current limiting components
conveyed FCC Part 68 approval.
identified as F1 and F2 in dashed Box #1 must
also survive FCC Part 68 surge testing. Refer to
B. In most environments, 2 terminal surge
Cermetek Application Note #126, Supplemental
suppressors are adequate.
For severe
PSTN Line Protection, for more details. Refer to
environments, use an external 3 terminal
Application Note # 130, Summary of Recommend
device with an earth ground.
Suppliers, for a list of suppliers and associated
part numbers.
3. EMI/RFI Suppression.
A. A PTC (rated at 0.15 amps) is preferred
No external EMI/RFI noise suppression circuitry is
because it resets automatically upon removal
required to maintain conveyed FCC Part 68
of the current flow. Fuse devices are also
approval.
However, additional suppression, if
acceptable. Refer to Application Note #130
required for other reasons, may be added as
for a complete list of recommended vendors
described below in Sections 3A-3B without
and associated part numbers.
adversely affecting FCC Part 68 approval.
B. Resistors (10 Ω carbon film or 1/8 watt
A. To provide adequate EMI/RFI suppression,
minimum) may be used in Canada, as
the capacitor/inductor network contained in
Canada has no requirements that PSTN
dashed Box #3 should be located as close to
equipment be operational after a Type B
the RJ-11C jack as possible.
Further, this
surge test.
network should be provided with an excellent
C. Although Industry Canada CS-03 Part 1
ground path to the chassis.
(Canada) follows the requirements of FCC
B. Capacitors C1 and C2 should not exceed
Part
68
(USA),
Cermetek
recommends
0.005 µ f. They must have a rating of 1.5KV
contacting DOT (Canada) and/or a certified
and typically are 0.001 µ f ± 20%. Inductors L1
independent lab to verify compliance.
For
and L2 may be either individual inductors or a
Canada, use either 10 Ω resistors (carbon film
dual inductor. Refer to Application Note #130
or SMD parts 1/8 watt minimum) as described
for a complete list of recommended vendors
in paragraph B above.
and associated part numbers.
For UL
applications, choose capacitors and inductors
that are UL 1950 listed. The actual values of
the components used may vary depending on
the end product design.
2005 Cermetek Microelectronics, Inc.
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Document No. 607-0017-01 Revision A (05/05)
Cermetek Microelectronics, Inc.
High Speed Internet Modem Family
Table 3. Analog Characteristics.
NAME
TYPE
CHARACTERISTICS
VALUE
SPK
O(DF)
Minimum Load
300ohm
Maximum Capacitive Load
0.01µf
Output Impedance
10ohm
Output Voltage
2.5 ± 1.6V
D.C. Offset
<20mV
Table 4. Summary CH2165 iModem Family of Products.
Model
Summary of Features
Operating Temperature
CH2165
Send and Retrieve Streaming Email. Email Send Control Pin
0°C to 70°C
Full Function, V.90, 56Kbps, FCC Part 68 Approved, UL 1950 listed.
Table 5. CH2165 iModem Electrical Specifications.
Symbol
Characteristic
Min.
Typ.
Max.
Units
V CC
Positive Supply Voltage
4.5
5.0
5.5
V
I CC Off Hook
Nominal Operating Current @
300.0
mA
V CC = 5.5V when modem is Off Hook
V IH
High Level Input Voltage @ 5.0V
2.0
3.5
V
V IL
Low Level Input Voltage @ 5.0V
1.0
2.2
V
V IH
High Level Input Voltage (Excluding IN1, IN2,
2.0
3.5
V
SEND) @ 5.0V
V IL
Low Level Input Voltage (Excluding IN1, IN2,
0.8
V
SEND) @ 5.0V
VT+
Positive Hysteresis Threshold for RESET Pin
2.9
V
VT-
Negative Hysteresis Threshold for RESET Pin
1.98
V
V OH
High Level Output (Including SENT) with I OH =
2.4
V
0.5mA
V OL
Low Level Output (Including SENT) with I Ol =
0.6
V
1.6mA
I IN
Input Leakage Current (TXD, DTR, RTS)
100
uA
I IL
Input Current (RST, IN1, IN2, SEND)
1.0
uA
C P
Capacitive Load (TXD, DTR, RTS)
10
pF
Capacitive Load (RTS)
8
pF
2005 Cermetek Microelectronics, Inc.
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Document No. 607-0017-01 Revision A (05/05)
Cermetek Microelectronics, Inc.
High Speed Internet Modem Family
Table 6. CH2165 iModem Electrical Specifications.
Parameter
Minimum
Typical
Maximum
Units
Comments
Off Hook Impedance
20
Mohm
Trans Hybrid Loss
25
dB
600 Ohm, RXA, TXA
Ring Voltage Loop
15
V PP
On 48VDC line voltage
for sustained periods
Line Loop Current - (Off
20
60
mA
Hook)
Return Loss @ 1000 Hz
15
dB
600 Ohm
Ring Frequencies
18
20
30
Hz
Receiver Insertion Gain
-0.5
0.0
+0.5
dB
Transmit Power
-9.5
dBm
600 Ohm- Data Mode
First Character After Reset
25.0
sec
Delay
See Note 1
Inter Character Delay
20
50
msec
Between all command
characters
Command Delay
100
200
msec
Between all AT
commands
Minimum Reset Pulse
1
µsec
If user supplied
Note: 1. All CH2165 iModem devices re-load operating firmware upon reset and then perform an internal
self-check. The CH2165 will not respond to commands issued during this sequence.
Figure 8.
Physical Dimensions and Pin Functions for CH21XX Product Family.
2005 Cermetek Microelectronics, Inc.
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Document No. 607-0017-01 Revision A (05/05)
Cermetek Microelectronics, Inc.
High Speed Internet Modem Family
Cermetek reserves the right to make changes in specifications at any time and without notice. The information furnished by
Cermetek in this publication is believed to be accurate and reliable. However, Cermetek assumes no responsibility for its use, or for
any infringements of patents or other rights of third parties resulting from its use. No license is granted under any patents or patent
rights of Cermetek.
Cermetek provides the user with a FCC (USA) and IC (Canada) Approved or Approvable device. However, Cermetek does not
have influence over nor knowledge of the specific user application environment. Therefore, for FCC and IC Approved or Approvable
devices, the user assumes all risk for maintaining compliance to registration.
Printed in U.S.A
1390 BORREGAS AVENUE | SUNNYVALE CA 94089 | LOCAL: 408-752-5000 | TOLL FREE: 1-800-882-6271 | FAX: 408-752-5004
CERMETEK WEB SITE: http://www.cermetek.com | EMAIL: sales@cermetek.com
2005 Cermetek Microelectronics, Inc.
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Document No. 607-0017-01 Revision A (05/05)