Specifications

7-38
Reference Guide
Model No.
Running Head
WAN Card User Screens and Settings WAN Card
commands, it is recommand that you send an
off
command before sending another loopback
activation command. e.g. this set of selections
plb, off, llb, off
transmits the following
commands: payload activate, payload deactivate, line activate, and line deactivate.
LB DET
This option allows the card to detect DS1 channel, and ANSI T1.403 (8015 and 8020 WANs
only) loopbacks. When set to
off
, no T1 loopbacks can be detected. When set to
on
, T1
loopbacks will be detected and maintained until a loop down is detected. The with/time-out
(
w/to
) is the same as on except that if no loop down is detected after 10 minutes, the loopback
will self-terminate.
The WAN HDSL (8020) card and WAN ESF LPBK (8015) with ESF Payload Loopback are
the only cards that detect ANSI T1.403 loopback commands. The other WAN cards will only
respond to “in-band” loopback codes. If the WAN is in loopback due to a command from a
remote device, the loopback will be dropped if you switch to
off
.
ESF Loopback Detection is supported for payload loopback activation and deactivation, as
well as for universal loopback deactivation. ESF line loopback activation is not supported. To
cause a remote unit to go to line loopback use NREM or CREM from WAN HDSL screen
(Figure 7-37). Detection of remote inbank loopbacks generated using the test screen is not
supported, to cause a remote unit to go to line loopback use NREM or CREM from WAN
HDSL screen (Figure 7-37).
Note that “LB DET” is for ESF and in-band loopbacks. It is not possible to disable the
detection of remote PairGain loopbacks, although you may still have timeout using the “LB
TIMEOUT” field in WAN HDSL screen (Figure 7-37). Line Loopback is not supported from
the WAN Main screen, to activate a line loopback use NREM or CREM from WAN HDSL
screen (Figure 7-37). Local loopback of the WAN Main screen does not timeout and is
independent of the loopbacks from the WAN HDSL screen.
ESF/NMS RP
This setting specifies the format in which performance statistics for the T1 link will be
gathered and stored in the system. In ESF mode, these performance statistics are accessible to
the carrier over the Facilities Data Link (FDL) as well as through the user interface. The
options are
none
,
at&t
,
ansi
,
c-fdl, c-b7r
and
e-fdl.
The
at&t
option requires the statistics be
gathered in accordance with AT&T Publication 54016 whereas the
ansi
option requires the
ANSI T1.403 specification be used. Performance statistics are also available for D4 formatted
T1 lines. See the “T1 Performance Monitoring” section later in this chapter for more detailed
information on this topic.