XE2422H
April 2006
Low-Cost, 2400 BPS Surface-Mount Modem
Description
Features
XE2422H is a complete miniature, surface-mount,
2400 bps modem. It permits the designer to easily
incorporate dial-up communications into set top
box, security, vending, or point-of-sale applications.
212A modem protocols
XE2422H is not just a modem chip. The only
design requirements are a serial port connection to
the micro-controller and the connection to the
telephone line. The XE2422H includes transferable
FCC Part 68 Registration eliminating FCC Part 68
testing for the Xecom customer.
With the XE2422H, Xecom lowers the total cost of
modem ownership. As a complete modem, it
voice communications on an extension telephone.
dramatically reduces modem development and
certification costs. Assembly costs are reduced as
dozens of components are replaced with this single,
surface-mount module. And since Xecom tests
100% of all modules, quality is also improved. The
cost of the XE2422H is under nine dollars in
100,000 piece quantities. Contact Xecom for
pricing at other quantities
XE2422H BLOCK DIAGRAM
/Reset
TXD
ROM
RXD
Modem
/DCD
Controller
Analog
Telephone
Tip
/CTS
Front
Line
Ring
End
Interface
/INT
(DAA)
/RI
XECOM
(1)
XE2422H
XE2422H Mechanical Specifications
A
E
J
D
F
F
I
B
(bottom)
F
C
G
H
Inches
Millimeters
Dimension
Min
Typ
Max
Min
Typ
Max
A
1.595
1.600
1.605
40.51
40.64
40.77
B
0.795
0.800
0.805
20.19
20.32
20.45
C
0.147
0.152
0.157
3.73
3.86
3.99
D
0.095
0.100
0.105
2.41
2.54
2.67
E
0.055
0.060
0.065
1.40
1.52
1.65
F
0.095
0.100
0.105
2.41
2.54
2.67
G
1.045
1.050
1.055
26.54
26.67
26.80
H
0.495
0.500
0.505
12.57
12.70
12.83
I
0.995
1.000
1.005
25.27
25.40
25.53
J
0.395
0.400
0.405
10.03
10.16
10.29
XECOM
(2)
XE2422H
XE2422H Pin Configuration
Top View
Tip
1
Ring
2
13
VCC
/DCD
3
12
/INT
/DTR
4
11
/CTS
/RI
5
10
/RESET
Reserved
6
9
RXD
GND
7
8
TXD
Note: Pin 1 is marked with a white circle on the top of the module
Pin Descriptions
PIN NAME
DESCRIPTION
1
Tip
The Ring and Tip signals connect the modem to the telephone line. FCC Part 68 Rules
require a 1500 volt isolation barrier between the telephone line and all other circuits.
This isolation must be preserved throughout the system.
The telephone company places a DC “Battery” voltage across Tip and Ring on public
switched telephone lines. The XE2422H operates regardless of the polarity of this
voltage. The “Battery” voltage drives up to 120 milliampere of DC loop current.
UL60950 requires minimum creepage and clearances distances between the Tip and
Ring traces and all other circuits. Clearance is the shortest distance between conductive
circuits; creepage is the distance between conductive points along the surface
2
Ring
The Ring and Tip signals connect the modem to the telephone line. FCC Part 68 Rules
require a 1500 volt isolation barrier between the telephone line and all other circuits.
This isolation must be preserved throughout the system.
The telephone company places a DC “Battery” voltage across Tip and Ring on public
switched telephone lines. The XE2422H operates regardless of the polarity of this
voltage. The “Battery” voltage drives up to 120 milliampere of DC loop current.
UL60950 requires minimum creepage and clearances distances between the Tip and
Ring traces and all other circuits. Clearance is the shortest distance between conductive
circuits; creepage is the distance between conductive points along the surface.
XECOM
(3)
XE2422H
XE2422H Pin Descriptions (continued)
PIN NAME
DESCRIPTION
3
/DCD
/DCD is an active low output from the modem that indicates the presence of a valid
carrier signal. The SE2 register controls /DCD in the XE2422H. The default state is
for /DCD to be disabled ATSE2=04 enables /DCD.
4
/DTR
/DTR is an active low input to the modem. The operation of /DTR is controlled by
register SE2 and is normally disabled. When enabled, the modem will exit data mode
and enter command mode if /DTR is removed while the modem is on-line. In Pulse and
FSK Alarm modes raising /DTR is the only was to disconnect the data link.
5
/RI
The /RI signal reports on the presence of an incoming ring signal. When a ring occurs
across Tip and Ring, the /RI output goes low and toggles with the cadence of the ring
signal. /RI is controlled by register S0D bit 6. The default condition is for /RI to be
disabled.
6
Reserved
Reserved for future use
7
Ground
Ground provides the reference voltage for all host interface signals.
8
TXD
TXD provides the path for transmitted data and modem commands to be passed from
the host controller to the modem. A logic high on TXD represents a “Mark” condition
and a logic low represents a “Space” condition.
9
RXD
RXD provides the path for received data and modem responses to be sent from the
modem to the host controller. A logic high on RXD represents a “Mark” condition and
a logic low represents a “Space” condition.
10
/RESET
/RESET is an active low input which initiates a modem hardware reset.
11
/CTS
/CTS is an active low output from the modem. The modem asserts /CTS to indicate that
it can accept data from the terminal equipment on TXD.
12
/INT
/INT provides an active low hardware interrupt signal from the XE2422H. The operation
of this interrupt pin is programmable using registers SE2 and S08. /INT can be
programmed to indicate Loss of Carrier, Wake-on-Ring, Loss of Loop Current, or
Shared Line Activity. Once triggered the /INT line remains active until cleared by the
AT:I command.
13
VCC
VCC provides 3.3 volt power to the modem.
XECOM
(4)
XE2422H
XE2422H Electrical Specifications
Parameter
Min
Typ
Max
Units
Comments
VCC
3.0
3.3
3.6
Volts
ICC
8
mA
On Line
5
mA
Sleep
0.060
mA
Power Down
Ring Voltage Detected
26
150
VRMS
Type B Ringer
Ring Frequency Detected
15.3
68
Hz
Type B Ringer
Telephone Loop Current
16
40
120
ma
Line Impedance
600
Ohms
Data Transmit level
-9.0
dBm
DTMF Transmit Level
-2.5
0
dBm
Avg over 3 second interval
Voh
2.4
Volts
Vol
0.4
Volts
Vih
2.0
5.0
Volts
Vil
-0.3
0.8
Volts
XE2422HABSOLUTE MAXIMUM RATINGS
Storage Temperature
-25 O C to +85 O C
1 Maximum Operating Temperature Range
0 O C to +70 O C
MaximumTimeAbove Eutectic (183 O C)
90 seconds
Preheat Dwell Time
120 to 180 seconds
1 The XE2422H can be screened for operation from -40 O to +85 O C. To specify this Industrial Temperature Range add the
suffix -ITR to the model number on your Purchase Order.
XECOM
(5)
XE2422H
XE2422H Surface-Mount Soldering Instructions
The XE2422H is subject to damage if overexposed to heat during solder reflow operations. Following the
soldering instructions below will ensure that the process of soldering the module to the board does not
damage the modem.
Maximum Temperature
220 O C
Maximum Time at 220 O C
20 Seconds
Maximum Time above Eutectic (180 O C)
90 Seconds
Maximum Preheat Dwell Time
180 Seconds
Maximum Recommended Solder Temperature Profile
220 O C
180 O C
150 O C
-20 sec-
------------------------------180secmax-------------------------
max
----- 90 sec max -----
XECOM
(6)
XE2422H
XE2422H Typical Connection Diagram
To Host Serial Port
VCC
XE2422H
VCC
RJ11
/DCD
F1
/CTS
RING
RXD
TXD
TIP (22)
/RI
To System Reset
/Reset
To System Interrupt
/INT
C1
C2
GND
Parts List for XE2422HTypical Connection Diagram
Reference
Designation
Qty
Description
C1,C2
2
Cap.1000pfd,1500Vminimum
F1
1
PTC,TR600-150
Notes:
1 Capacitors, C1 and C2, may be required for EMI filtering in your system. Without these components
you may experience unintended radiation when the telephone cable is attached. C1 and C2 are high-
voltage capacitors. We recommend the Johanson Dielectrics 502S47N102KV6T. This 1000 pfd, 3000
volt capacitor will direct the high frequency harmonics to the system ground. These capacitors must
be rated at a minimum of 1500 volts to maintain the isolation required by FCC Part 68 Rules.
3. F1 is a positive thermal coefficient (PTC) device which protects the modem from excessive current
flow. These devices are required for your system to pass UL60950. Fuses may be used in place of
the PTC’s
XECOM
(7)
XE2422H
XE2422H Shared Line Features
The XE2422H monitors line conditions before, after,
Handset Interrupt:
and during calls. This allows conflicts with other
Handset Interrupt permits the modem to yield the
equipment connected to the telephone line to be
phone line when other equipment on the line goes
avoided. The XE2422H includes two Shared Line
off-hook. This prevents the modem from blocking
Features; Connect Detect and Handset Interrupt.
outgoing emergency calls when the telephone line is
shared as in residential use. The modem monitors
Connect Detect
loop current while it is off-hook. The loop current
Register SDB stores the XE2422H on-hook
will drop if another device on the line goes off-hook.
telephone line voltage. The modem checks the value
of register SDB before going off-hook to avoid
Register SF3 holds the loop current value in 1.1
interrupting a call in progress. The typical value for
milliamp increments. The XE2422H updates SF3
telephone line voltage while on-hook is 48 volts. A
regularly. The loop current value stored in SF3 is
lower voltage level indicates that the line is either
compared to the values of registers S11 and S12. If
disconnected from the modem or is currently in use.
the value S12 is greater than the value of SF3 plus
S11, then the XE2422H assumes the equipment
Register SDB is an 8 bit register. It stores the loop
connected to the telephone line has gone off-hook,
voltage as a 2’s complement number with each bit
issues the Handset Interrupt response “i” and, if so
representing 1 volt.
The Most Significant Bit
configured, issues an Interrupt to the host controller.
represents the polarity of the loop voltage.
The host controller determines whether to terminate
the call and yield the line to the other equipment.
V.22/Bell 212 Fast Connect
The XE2422H supports Fast Connect algorithms for Bell 212 and V.22 operation. These reduce the
handshaking time required for faster transaction times in applications with small data loads. Nine Registers
are used to control the Fast Connect feature as shown in the chart below
Fast
Register
Function
Units
Default
Connect
S1E
TransmitAnswer ToneLength
1 s
0x03
0x00
S1F
Answer Tone to Transmit Delay
5/3 ms
0x2D
0x00
S20
Unscrambled Ones Length (V.22)
5/3 ms
0x5D
0x00
S21
Transmit Scrambled Ones Delay (V.22)
53.3 ms
0x09
0x00
S22
Transmit Scrambled Ones Length (V.22)
5/3 ms
0xA2
0x00
S23
V.22/V.22b Data Delay Low
5/3 ms
0xCB
0x00
S24
V.22/V.22b Data Delay High
5/3 ms
0x08
0x00
S34
Answer Tone Length (S1E =0x00)
5/3 ms
0x5A
0xF0
S35
Receive V.22 Scrambled Ones Length
5/3 ms
0xA2
0x00
XECOM
(8)
XE2422H
XE2422H AT Commands
The XE2422H uses a simplified "AT" command set
Alarm Mode:
for configuration and control. This section describes
The XE2422H supports a unique set of commands
theAT command format and lists the AT commands,
to establish alarm industry connections. Both Pulse
registers and result codes. XE2422H "AT"
messaging and FSK formats are supported. The
commands have three operational modes; command
AT!1 command initiates Pulse messaging and AT!2
mode, alarm mode and data mode. The Data Rate
initiates FSK messaging. The ATD command must
for the XE2422H is set by Register SE0.
precede either AT! command to begin the Alarm
transaction. In Alarm mode, /DTR must be
Data Mode: The XE2422H enters data mode
removed to disconnect the modem link. /DTR is
after it connects to a remote modem and issues the
activated by setting register SE2 bits 4 and 5.
appropriate result code.
In the data mode the
modem sends all data presented on Transmit Data
Pulse Mode: In Pulse Mode messages are passed
(TXD) to the remote modem and puts data from the
using DTMF tones. The receiving station
remote modem onto Received Data (RXD). When
acknowledges
receipt
of
the
message
by
the modem exits data mode, it issues a "NO
transmitting the “Kissoff” tone. A sample
CARRIER" result code.
transaction is shown below.
Command Mode:
The XE2422H enters
Alarm Panel
XE2422H
command mode on power-up, reset, a lost
ATDT#!1<message 1><CR>
connection, or receipt of the escape code. In
K
command mode the modem accepts commands
from the host on transmit data. Appropriate result
!<message 2><CR>
codes are returned on RXD.
K
!<message n><CR>
Command Line Format
Command lines issued to the modem follow a strict
K
format. Each command line begins with the prefix
Disconnect is accomplished by raising /DTR.
AT. All commands except the “z” command must
be entered in upper case characters. The command
FSK Mode: In FSK Mode messages are passed
line is a string of commands between the AT prefix
on a 300 bps, half-duplex carrier signal. The X1,
and the carriage return which terminates the
X2, and X3 commands switch the modem between
command.
The command buffer stores the
monitoring the line for acknowledgments (X1),
command line and executes it upon receipt of a
transmitting
messages
(X2),
and
receiving
carriage return. Commands will be executed in the
messages (X3). As in the pulse mode disconnect is
sequence they appear in the command line.
only possible by pulling the /DTR signal high.
Result Codes - The modem issues a result code
after each command line. Result codes may be sent
as single characters or single characters followed by
a carriage return.
XECOM
(9)
XE2422H
XE2422H AT Commands
An asterisk indicates the factory default
Z - Reset -
A - Answer Command -
z - Wake from Sleep Mode on Ring
D - Dial Command -
!1<message> - Switch to Pulse Mode: This
0-9,A-D, #, * = Dialing Digits
command must follow the dialing command in the
P = Pulse dial
same command string.
T = Tone dial
!2<message> - Switch to FSK Mode: This
,
= Pause for two seconds
command must follow the dialing command in the
I = Pause for 125 milliseconds
same command string. This command allows the
; = Return to the command state
modem to establish a 300 bps half-duplex FSK
En - Command Echo
signal.
n=0 Do not echo commands
X1 - FSK Signal Search: Turns off the modem
n=1 Enable command echo *
transmitter and monitors the line for an
Hn - Switch Hook Control -
acknowledgment.
n=0 Switch hook relay opens
X2 - Return On-line as Transmitter: Places
n=1 Switch hook relay closes
the modem in the transmit mode during FSK half-
In - Modem Identification
duplex operation.
:I Read Interrupt Register - Read and reset
X3: - Return on-line as Receiver: Places the
the interrupt status register S09
modem in the receive mode during FSK half-
O - Return On Line
duplex operation.
SR? - Read Value of register R
~ - Resend Last Pulse Mode Message:
SR=n - Write value “n” into register “R”.
The values of both “n” and “R” are hexa-
decimal.
Vn - Result Codes -
n=0 Single Character Result Codes
n=1 Result Codes followed by a Carriage
Return*
XECOM
(10)
XE2422H
XE2422H RESPONSES
Result Code
Description
a
British Caller ID Tone Detected
b
Busy Tone Detected
c
Connect
d
Connect 1200
f
Battery Voltage Reversal Detected
H
Modem automatically hung up in Security Mode
I
Parallel Handset Returned On-Hook
i
Handset Interrupt Detected
K
Kissoff Tone Detected in Security Mode
k
Kissoff Tone exceeds Limit set by S36
L
Phone Line Detected
l
No Phone Line Detected
m
Caller ID Signal Detected
N
No Carrier Detected
n
No Dial Tone
O
OK Response
R
Ringing
r
Ringback Tone Detected
t
Dial Tone Detected
x
Over-current Condition Detected
v
Connect in V.23 originate mode
^
Kissoff Tone Detection Required
,
Dialing Complete
XECOM
(11)
XE2422H
XE2422H REGISTER SETTINGS
XE2422H register values are stored in Hex format. An asterisk “*” signifies the default setting of a bit-
mapped register.
S00 Answer on nth Ring: S00 sets the modem to automatically answer on the nth ring. Setting S00
to 0 disables automatic answer.
Range:
00 to 7F (0 to 127 rings)
Units
Rings
Default
00 (Auto Answer Disabled)
S01 Wait to Dial: S01 determines the maximum time the modem will wait to dial
Range:
0 to 6D (0 to 109 seconds)
Units
Seconds
Default
02 (2 seconds)
S02 Wait for Dial Tone S02 determines how long the modem waits for Dial Tone before hanging up.
Range:
00 to 6D (0 to 109 seconds)
Units
Seconds
Default
03 (3 seconds)
S03 Carrier Off Disconnect Delay : S03 determines how long carrier must be lost before modem
disconnect.
Range:
00 to 7F (0 to 6.78 seconds)
Units
0.0533 Seconds
Default
0E (0.75 seconds)
S04 DTMF Duration and Spacing: S04 sets duration and spacing of DTMF dialing tones.
Range:
00 to 7F (0 to 211 milliseconds)
Units
1.666 milliseconds
Default
30 (80 milliseconds)
S05 Duration Off-Hook during Pulse Dialing: S05 defines how long the hookswitch is active
between dialing pulses.
Range:
00 to 7F (0 to 211 milliseconds)
Units
1.666 milliseconds
Default
18 (40 milliseconds)
S06 Duration of Dialing Pulses: S06 determines how long the modem goes on-hook to generate
dialing pulses.
Range:
00 to 7F (0 to 211 milliseconds)
Units
1.666 milliseconds
Default
24 (60 milliseconds)
XECOM
(12)
XE2422H
XE2422H REGISTER SETTINGS
S07 Modem Protocol Selection: S07 sets the protocol and speed of the modem connection.
Protocol
Data Rate
Register Value
V.22bis
2400 bps
06 *
V.22
1200 bps
02
V.21
300 bps
03
Bell 212A
1200 bps
00
Bell 103
300 bps
01
S08 Interrupt Control Register: S08 is a bit-mapped register which defines the events that will
cause the /INT signal to be activated. Default = 00
Bit #
Definition
Action
7
Issue Interrupt when Carrier Detect is lost
0 = No Interrupt *
1= Activate Interrupt
6
Issue Interrupt on Ring with Wake-on-Ring selected 0 = No Interrupt *
1= Activate Interrupt
5
Issue Interrupt on Handset Interrupt Detection
0 = No Interrupt *
1= Activate Interrupt
4
Issue Interrupt on No Connect Detection
0 = No Interrupt *
1= Activate Interrupt
3
Issue Interrupt on Ring Detection
0 = No Interrupt *
1= Activate Interrupt
2
Issue Interrupt on Caller ID
0 = No Interrupt *
1= Activate Interrupt
1
Issue Interrupt on Over-current Detection
0 = No Interrupt *
1= Activate Interrupt
0
Reserved
S09 Interrupt Status Register: S09 is a bit-mapped register. The active bit indicates the cause of the
most recent interrupt. S09 is cleared when read on receipt of the :I command. Default = 00
Bit #
Definition
7
Interrupt issued when Carrier Detect was lost
6
Interrupt issued when a Ring was detected with Wake-on-Ring selected
5
Interrupt issued on Handset Interrupt Detection
4
Interrupt issued on No Connect Detection
3
Interrupt issued on Ring Detection
2
Interrupt issued on Caller ID
1
Interrupt issued on Over-current Detection
0
Reserved
XECOM
(13)
XE2422H
XE2422H REGISTER SETTINGS
S0C Modem Function Register: S0C is a bit-mapped register which controls the designated modem
functions. Default = 00
Bit #
Definition
Action
7
Enable Carrier Detect IO pin
0 = No DCD output *
1= DCD Active
6
Reserved
5
Enable Caller ID
0 = No Caller ID *
1= Caller ID Active
4:3
Reserved
2
Blind Dialing, dialing without detecting dial tone
0 = Dial Tone Required *
1 = Blind Dialing Selected
1:0
Reserved
S0D Modem Function Register: S0D is a bit-mapped register which controls the designated modem
functions. Default = 00
Bit #
Definition
Action
7
Reserved
6
Enable Ring Indicate IO pin
0 = No RI output *
1 = RI Active
5:4:3
Reserved
2
Disconnect upon detection of a Busy Signal
0 = Disabled *
1 = Hang-up on Busy Detect
1
Disconnect on Handset Interrupt detection
0= Disabled *
1 = Enabled
0
Reserved
S0E Pulse Dialing Interdigit Delay: S0E determines the length of the time between numbers dialed
using dialing pulses. The minimum time between digits is 64 milliseconds. The value of S0E adds to
that 64 millisecond delay in 10 millisecond increments
Range:
00 to 7F (64 to 1374 milliseconds)
Units
10 milliseconds
Default
46 (764 milliseconds)
S0F Escape Character: S0F defines the character to be used in the escape sequence to move from
data mode to command mode. Values of 0 to 127 select valid ASCII characters.
Range:
00 to 7F
Units
ASCII Character
Default
2B (+)
XECOM
(14)
XE2422H
XE2422H REGISTER SETTINGS
S10 Escape Code Guard Timer: S10 defines the duration of the guard timer surrounding the escape
sequence. The guard time is the time preceding and following the escape sequence during which
any character received by the modem will abort the escape sequence.
Range:
00 to 7F (0 to 6.78 seconds)
Units
0.0533 Seconds
Default
13 (1 second)
S11 Handset Interrupt Differential Current Threshold: S11 sets the differential loop current
threshold for the XE2422H handset Interrupt detection algorithm. If loop current falls by the value
of S11 below the value of S12, Handset Interrupt is activated.
Range:
00 to 07 (0 to 7 milliamps)
Units
1 Milliamp
Default
04 (4 milliamps)
S12 Handset Interrupt Current Threshold: S12 sets the loop current threshold for the XE2422H
Handset Interrupt detection algorithm. If loop current falls by the value of S11 below the value of
S12, Handset Interrupt is activated.
Range:
00 to 64 (0 to 100 milliamps)
Units
1 Milliamp
Default
00 (0 milliamps)
S15 Modem Link Control Register: S15 selects modem guard tones, calling tones and data format..
Default = 04
Bit #
Definition
Action
7
Reserved
6
Transmit V.25 Calling Tone
0 = Disabled *
1 = Calling Tone Active
5
Transmit 550 Hz Guard Tone
0 = Disabled *
1= 550 Hz Guard tone Active
4
Transmit 1800 Hz Guard Tone
0 = Disabled *
1= 1800 Hz Guard tone Active
3
Number of Stop Bits
0 = 1 Stop Bit *
1 = 2 Stop Bits
2:1
Number of Data Bits
00 = 6 Data Bits
01 = 7 Data Bits
10 = 8 Data Bits *
11 = 9 Data Bits
0
Reserved
S29 Handset Interrupt Blocking Time: S29 provides a set duration for blocking the Handset
Interrupt feature to avoid false detections. This timer is activated by S82.
Range:
00 to 7F (0 to 63.5 Seconds)
Units
0.5 Seconds
Default
00 (disabled)
XECOM
(15)
XE2422H
XE2422H REGISTER SETTINGS
S37 Carrier Detect Recovery Time: S37 determines how long after being lost the data carrier signal
must be detected before the modem recognizes it as being recovered.
Range:
00 to 7F (0 to 211 milliseconds)
Units
1.66 milliseconds
Default
20 (53.33 milliseconds)
S39 Carrier Detect Response Time: S39 determines how long the modem will wait for the initial
data carrier signal to be detected before aborting a call..
Range:
00 to 7F (0 to 127 Seconds)
Units
1 Second
Default
3C (60 Seconds)
S62 Result Code Register: S62 allows selection of specific modem result codes. Default = 41
Bit #
Definition
Action
7
Reserved
6
Over-current Result code “x”
0 = Result Code “x” supported
1 = Disabled *
5:4:3
Reserved
2
Handset Interrupt Result Codes “I” and “i”
0 = Disabled *
1 = Support result codes “I’ and “i”
1
Connect Detect Result Codes “L” and “l”
0 = Disabled *
1 = Support result codes “L’ and “l”
0
Ring Result Code “R”
0 = Disabled
1 = Result Code “R” supported
S82 Loop Current Register: S82 allows selection of specific modem result codes. Default = 08
Bit #
Definition
Action
7:6:5:4
Reserved
3
Detect Loss of Loop Current
0 = Disabled
1 = Enabled *
2:1
Block Handset Interrupt on initial connection
00 = No Handset Interrupt Blocking *
01 = Blocked during dialing
10 = Blocked unit S29 Time out
11 = Blocked unit Carrier Detect
0
Reserved
XECOM
(16)
XE2422H
XE2422H REGISTER SETTINGS
SDB Line Voltage Status: SDB is a read only register that stores the value of the loop voltage in two’s
compliment form. The most significant bit, Bit 7, indicates the polarity of the voltage on Tip and
Ring.
Units
1 Volt
Default
00 (Tip and Ring Voltage less than 3 volts)
SE2 Interrupt Enable: SE2 activates the XE2422H Interrupt output. Default = 00
Bit #
Definition
Action
7:6:
Interrupt Output Control
00 = Disabled *
01 = Disabled
10 = Disabled
11 = Interrupt Output Enabled
5:4
/DTR Control
00 = Disabled *
01 = Disabled
10 = Disabled
11 = /DTR Enabled
3:2
/DCD
00 = /DCD Disabled*
01 = /DCD Enabled
10 = /DCD Disabled
11 = /DCD Disabled
1:0
Reserved
SF1 Power Down Register: SF1 allows the XE2422H to be placed in power down mode. The modem
draws only about 100 microamps in Power down mode. Default = 0C
Bit #
Definition
Action
7
Reserved
6
Power Down Mode
0 = Normal Operation
1 = Power Down Selected
5:4
Reserved
3:2
Forced Active
1:0
Reserved
SF3 Loop Current Status: SF3 is a read only register that stores the current value of the loop current.
Units
1.1 Volt
Default
00 (no Loop Current Present)
XECOM
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XE2422H
FCC Instructions
The XE2422H complies with Part 68 of the FCC Rules and Regulations. With each device shipped, there is a label which
contains the FCC Registration Number. The FCC Registration number incorporates the Model Number, Manufacturer
Indentifier, Product Type identifier and Ringer Equivalence Number (REN) for this product. You must, upon request, provide
this information to your telephone company. The format of the FCC Registration Number is shown below.
US: DWEMM00BXE2422H
The mounting of this device in the final assembly must be made in such a manner as to preserve the high voltage protection
between the TIP/RING Connection and the rest of the system. Typically, this may be accomplished by maintaining a minimum
spacing 100 mils between the TIP/RING Traces to the RJ-11C Jack and low voltage portion of the system. No additional
circuitry may be attached between TIP/RING and the telephone line connection, unless specifically allowed in the rules.
The REN is useful to determine the quantity of devices you may connect to a telephone line and still have all of these devices
ring when the number is called. In most, but not all areas, the sum of the RENs of all devices connected to one line should not
exceed five (5.0). To be certain of the number of devices you may connect to the line, as determined by the REN, you should
contact the local telephone company to determine the maximum REN for you calling area.
If your system causes harm to the telephone network, the telephone company may discontinue service temporarily. If possible,
they will notify you in advance. If advance notification is not practical, you will be notified as soon as possible.
Your telephone company may make changes in its facilities, equipment, operations or procedures that could affect proper
functioning of your equipment. If they do, you will be notified in advance to give you an opportunity to maintain uninterrupted
telephone service.
If you experience trouble with this device, please contact XECOM at (408) 945-6640 for information on obtaining service or
repairs. The telephone company may ask you to disconnect this device from the network until the problem has been corrected
or until you are sure that the device is not malfunctioning.
XECOM
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XE2422H
Terms of Sale
Devices sold by XECOM are covered by the warranty provisions appearing in its Terms of Sale only. XECOM makes no war-
ranty, express, statutory, implied, or by description regarding the information set forth herein, or regarding the freedom of the de-
scribed devices from patent infringement. XECOM makes no warranty of merchantability or fitness for any purposes.
XECOM reserves the right to discontinue production and change specifications and prices at any time and without notice. This
product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual envi-
ronmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment, are
specifically not recommended without additional processing and authorization by XECOM for such application.
Xecom assumes no responsibility for the use of any circuitry other than circuitry embodied in a Xecom product. No other cir-
cuits, patents, or licenses are implied.
Life Support Policy
Xecom's products are not authorized for use as Critical Components in Life Support Devices or Systems.
Life Support Devices or Systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) sup-
port or sustain life, and whose failure to perform, when properly used in accordance with instructions provided in the labeling,
can be reasonably expected to result in significant injury to the user.
A Critical Component is any component of a life support device or system whose failure to perform can be reasonably ex-
pected to cause failure of the life support device or system, or to affect its safety or effectiveness.
Copyright, Xecom © 2005
While Xecom, Inc. has made every effort to ensure that the information presented here is accurate, Xecom will not be liable for any damages arising from errors or
omission of fact. Xecom reserves the right to modify specifications and/or prices without notice. Product mentioned herein are used for identification purposes only
and may be trademarks and/or registered trademarks of their respective companies.
Xecom Incorporated
374 Turquoise Street, Milpitas, CA 95035
Ph:408-942-2200
Fax:408-942-1346
E-Mail: Info@Cermetek.com
XECOM
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XE2422H