Specifications

Reference Guide
7-23
WAN Card WAN Card User Screens and Settings
Table 7-6. AIS/ALM Settings
In a cross-connect system, the options available for D4 or ESF frame format 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 frame
format 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
7-24. 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
.
Figure 7-24. Line and Local Loopbacks
System Frame Format AIS/ALM
Cross-Connect D4 none, tcodr
ESF none, frm, unfrm
SLC-96 note, orb13, orb16
W
A
N
C
a
r
d
N
e
t
w
o
r
k
T
1
/
E
1
P
C
M
B
u
s
Local Loopback
Line Loopback
W
A
N
C
a
r
d
N
e
t
w
o
r
k
T
1
/
E
1
P
C
M
B
u
s