Appendix F Serial Port Interface; Rs-232 Serial Interface - NETGEAR XM128 ISDN Reference Manual

This appendix provides information about the serial port interface for the Model XM128 ISDN
Digital Modem.

RS-232 Serial Interface

Table F-1 describes the RS-232 25-pin serial port interface for the Model XM128 modem.
Table F-1. Serial port interface
ITU-TSS
Pin number
signal name
1 101
2 103
3 104
4 105
5 106
6 107
7 102
8 109
15 114
17 115
18 141
20 108/2108/1
21 140
Serial Port Interface
EIA
Signal/pin description
signal name
AA Protective ground (GND).
BA Transmitted data (TXD).
BB Received data (RXD).
CA Request to send (RTS).
CB Clear to send (CTS).
CC Data set ready (DSR).
AB Signal ground (GND).
CF Data carrier detected (DCD).
DB Transmit clock signal (source: DCE).
DD Synchronous receive clock.
Local analog loopback test.
CD Data terminal ready (DTR).
Connect DCE to line.
Remote digital loop test.
Appendix F
Serial Port Interface
Signal direction
DTE -DCE
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F-1