Appendix f serial port interface, Rs-232 serial interface, Tablef-1. serial port interface (continued) – NETGEAR XM128 ISDN User Manual
Page 143: Table f-1
Serial Port Interface
F-1
Appendix F
Serial Port Interface
This appendix provides information about the serial port interface for the Model XM128 ISDN
Digital Modem.
RS-232 Serial Interface
describes the RS-232 25-pin serial port interface for the Model XM128 modem.
Table F-1.
Serial port interface
Pin number
ITU-TSS
signal name
EIA
signal name
Signal/pin description
Signal direction
DTE -DCE
1
101
AA
Protective ground (GND).
¤
2
103
BA
Transmitted data (TXD).
?
3
104
BB
Received data (RXD).
‹
4
105
CA
Request to send (RTS).
?
5
106
CB
Clear to send (CTS).
‹
6
107
CC
Data set ready (DSR).
‹
7
102
AB
Signal ground (GND).
¤
8
109
CF
Data carrier detected (DCD).
‹
15
114
DB
Transmit clock signal (source: DCE).
‹
17
115
DD
Synchronous receive clock.
‹
18
141
Local analog loopback test.
?
20
108/2108/1
CD
Data terminal ready (DTR).
Connect DCE to line.
?
21
140
Remote digital loop test.
?