Com port interface – Paradyne 3162 DSU/CSU User Manual
Page 137
Pin Assignments
D-5
3162-A2-GB20-30
March 1999
COM Port Interface
The COM port connects to a PC for front panel emulation, to an ASCII terminal or
printer for alarms, to an async terminal, to a network device (e.g., a router) for
SNMP or Telnet applications, to the LAN Adapter for SNMP or Telnet
applications, or to another DSU/CSU’s AUX port for daisy chain connectivity.
(The SNMP LAN Adapter includes the cable that is needed to attach it to the
DSU/CSU.) The COM port connector is an 8-position keyed modular connector
(Table D-4). The data signals on this port are referenced to a DTE interface.
The COM port-to-PC cable is shown in
port-to-terminal/printer cable is shown in
NOTE:
For daisy-chaining an AUX port to a COM port, a customer-supplied,
8-pin-to-8-pin, straight-through cable is required and the appropriate
configuration options (Com Use and Aux Use) must be set to Daisy.
Whenever the cable is connected or disconnected, you should change the
Daisy selection to ensure that the correct parameters have been negotiated
for the link layer.
Table D-4.
COM Port Connector
Signal
Direction
Pin Number
DCE Transmit Clock
From DSU/CSU
1
DCE Receive Data
From DSU/CSU
2
Signal Ground
—
3
DCE Transmit Data
To DSU/CSU
4
DCE Data Terminal Ready
To DSU/CSU
5
DCE Carrier Detect
From DSU/CSU
6
DCE Request-to-Send
To DSU/CSU
7
DCE Receive Clock
From DSU/CSU
8