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Pin Assignments
D-6
3160-A2-GB21-80March 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-6). The data signals on this port are referenced to a DTE interface.
The COM port-to-PC cable is shown in Figure D-5 and the COM
port-to-terminal/printer cable is shown in Figure D-6.
NOTE:
For daisy-chaining an AUX port to a COM port, a 25-pin-to-8-pin 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-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