Specifications

Reference Guide
7-21
WAN Card WAN Card User Screens and Settings
STATE
In the standby state, the WAN port is electrically disconnected from the network. Set this field
to
stdby
(standby) while configuring WAN links, and then change it to
actv
(active) when
starting normal operations. If the WAN is in loopback due to a command from a remote device,
the loopback will be dropped if you switch to
stdby
.
MODE
In cross-connect systems, the Mode automatically defaults to (
xcon
).
FORMAT
The Format setting specifies the frame format to be used on the WAN link so that it matches
the frame format used by the T1 carrier. Set the Format parameter based on the type of frame
format the T1 carrier requires. If you are using an external Channel Service Unit (CSU), the
frame format must match that of the CSU. The options are
d4
(normal superframe),
esf
(extended superframe),
slc96
(subscriber loop carrier) and
slcd4
(subscriber loop carrier - D4).
Table 7-5 lists the DS0 time slots and their corresponding SLC

assignments, based on
Bellcore TR-TSY-000008.
LINE CODE
The Line Code setting matches the Line Code used by the T1 interface to that used by the T1
network. Set the Line Code to the type of Line Code used. If you are connected to an external
CSU, the line code must match that of the CSU. The options are
ami
and
b8zs
.
PULSE
CSU modules with the Line Code configured for
ami
mode requires the WAN system or the
attached customer equipment ensure pulse density (also known as ones density). In
z15s
mode, the system will monitor the outbound data stream and will place a “1” in the 16th bit
position whenever it detects fifteen consecutive zeros. In the transparent mode (
trnsp
), the
system will pass all incoming data (the DTE must provide 1s density). If the Line Code
parameter for the CSU is
b8zs
, the Pulse option will default to
trnsp
. If the WAN link is
equipped with a DSX plug-in module, this option will automatically default to
n/a
.
LINE LEN
The Line Length setting adjusts the T1 power level to compensate for the distance the signal
must travel before it reaches the first T1 line repeater or other device. For a DSX interface, the
options are
133
,
266
,
399
,
533
, and
655
feet. Or, choose
csu
to connect the DSX module to
the equipment side of a collocated external CSU.