Specifications

6-18 Reference Guide
Model No.
Running Head
WAN Card User Screens and Settings WAN Card
AIS/ALM
The AIS/ALM (Alarm Indication Signal/Alarm) setting allows you to specify the type of
“keep-alive” signal the system will generate on one T1/E1 link if the other one fails. The
AIS/ALM setting depends on the framing Format selected for this WAN card. Table 6-5 shows
the AIS/ALM settings for cross-connect systems.
Table 6-5. AIS/ALM Settings
In Bus Connect and Redundant Bus Connect systems, the only option available for D4 framing
is
none
(no AIS signal is to be generated). The options for ESF framing are
none
,
frm
for a
framed alarm signal and
unfrm
for an unframed alarm signal. The options for SLC-96
framing are
note
(network office terminating equipment),
orb16
(Office Repeater Bay -16
frames) and
orb13
(Office Repeater Bay - 13 frames).
In a cross-connect system, the options available for D4 or ESF framing are
none
(no AIS
signal is generated) and
tcodr
(transcoder operations). You can choose
tcodr
only after
selecting the Group option described later in this section. The options for SLC-96 framing are
note
(network office terminating equipment),
orb16
(Office Repeater Bay–16 frames), and
orb13
(Office Repeater Bay–13 frames). The AIS/ALM option for the SLCD4 format defaults
to
n/a
.
LINE LB
The Line Loopback setting loops the T1/E1 line back toward the network, as shown in Figure
6-21. This loopback also continues sending the incoming data toward the CPE. Choosing
on
allows you to test the end-to-end T1/E1 circuit path from the far end. Choosing
off
disables
the loopback and restores the normal signal path in both directions. If the WAN is in loopback
due to a remote device, the loopback will be dropped if you choose
on
.
System Framing Format AIS/ALM
Bus Connect/RB Connect D4 none
ESF none, frm, unfrm
SLC-96 note, orb13, orb16
Cross-Connect D4 none, tcodr
ESF none, frm, unfrm
SLC-96 note, orb13, orb16