Specifications

7-58
Reference Guide
Model No.
Running Head
WAN Card User Screens and Settings WAN Card
CIRCUIT ID
A Circuit ID is defined as a group of one or more DS0 time slots cross-connected from one
WAN link to another. Each circuit can carry either voice or data traffic, and needs its own
name to facilitate cross-connect management within the system. The Circuit ID field allows
you to name individual pass-through circuits. The Circuit ID can show any relevant title for
the pass-through connection, although each circuit ID must be unique. This ID can contain up
to 24 numbers, letters (uppercase and lowercase), and spaces, in any combination.
TRAIN MODE
This parameter determines the master/slave relationship between the units. The options are
master
or
slave
.
LOOPBACK
The available Loopbacks are listed in Table 7-22. The choices are:
nloc
,
crem
,
cloc
,
nrem
,
cdu1
,
cdu2
,
mdu1
, and
ndu2
. At the “master” side, loopback detection can be configured to
be with or without timeout, though it can not be turned off. When a module goes to local
loopback (loc lb, nloc, or cloc) it transmits an AIS pattern toward the network, and when a
“master” module goes to line loopback (crem) it transmits an AIS pattern toward the customer
interface. The only exception is that when a “slave” module goes to line loopback (nrem) it
transmits the signal from the network toward the customer interface and loop the network
signal back to the master unit. (AIS pattern is NOT substituted for the original signal). Figure
7-38 and Figure 7-39 shows System Loopbacks.
Table 7-22. Available PairGain T1/HDSL Loopbacks
Name Location Toward
none n/a n/a
NLOC Master OEM Master
NREM Slave OEM Master
CREM Master OEM Slave
CLOC Slave OEM Slave
NDU1 Doubler 1 Master
NDU2 Doubler 2 Master
CDU1 Doubler 1 Slave
CDU2 Doubler 2 Slave