Filter
Top Products
System connections 17
Table 1
DTE-to-DCE straight-through pin assignments (cont’d.)
Switch
Modem
Signal
Pin
number
DCE DB-9
pin number
DCE DB-25
pin number
Data terminal
ready (DTR)
44 20
Ground (GND)
55 7
Data set ready
(DSR)
66 6
Request to send
(RTS)
77
4
Clear to send
(CTS)
88
5
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
.