Nortel Networks 8600 PPP modem connection, Data terminal Ready DTR Ground GND Data set ready

			System connections 17
Table 1
DTE-to-DCE straight-through pin assignments (cont’d.)
	Switch	Modem
Signal
	Pin	DCE DB-9	DCE DB-25
	number	pin number	pin number
Data terminal	4	4	20
ready (DTR)
Ground (GND)	5	5	7
Data set ready	6	6	6
(DSR)
Request to send	7	7	4
(RTS)
Clear to send	8	8	5
(CTS)

The default communication protocol settings for the modem port are:

•9600 baud

•8 data bits

•1 stop bit

•No parity

Because the modem port receives DSR and CTS signals before transmitting, control lines are required in the cables. The modem port supports no inbound flow control. The port does not turn on and turn off control lines to indicate the input buffer is full.

To connect a modem to a Nortel Ethernet Routing Switch 8600, you can configure the modem port first using another type of connection to the command line interface (CLI) or Nortel Command Line Interface (NNCLI).

PPP modem connection

You can establish a PPP (Point-to-Point Protocol) link over serial asynchronous lines. PC clients use this link to connect remotely to a switch through a standard dial-up modem and the modem DTE port on the primary switch SF/CPU. You must configure the connection on both the remote client PC and the switch. The following figure shows a standard PPP connection to the Nortel Ethernet Routing Switch 8600.

Nortel Ethernet Routing Switch 8600

Commissioning

NN46205-319 01.01 Standard

30 May 2008

Copyright © 2008 Nortel Networks