Pin Assignments
D-9
3166-A2-GB20-20
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 asynchronous terminal, to a network device (e.g., a
router) for SNMP or Telnet applications, or to a LAN Adapter for SNMP or Telnet
applications. (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 unkeyed modular
connector (Table D-6). The data signals on this port are referenced to a DTE
interface.
The COM port-to-PC cable is shown in
Figure D-6
and the COM
port-to-terminal/printer cable is shown in
Figure D-7
.
Table D-6.
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
Summary of Contents for 3166 CSU
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