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Pin Assignments
D-9
3166-A2-GB20-10
November 1998
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