Com port interface – Paradyne 3161 User Manual
Page 229
E. Pin Assignments
3160-A2-GB24-10
March 2001
E-7
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 (for Model 3164) 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 unkeyed modular connector
(
). The data signals on this port are referenced to
a DTE interface.
The COM port-to-PC cable is shown in
Figure E-5, COM Port-to-PC Cable
, and
the COM port-to-terminal/printer cable is shown in
Port-to-Terminal/Printer Cable
.
NOTE:
For daisy-chaining an AUX port to a COM port (Model 3164 only), 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 E-5.
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