Manual

Support for QSIG Over BRI and Q.931 Over BRI Backhaul
Monitoring and Maintaining the Feature
37
Cisco MGC Software Release 9.5(2)
When the D-channel is associated with an FAS signaling path, the system returns a message similar to
the following:
Media Gateway Controller 2000-03-26 20:26:18
M RTRV
"dchan-1:fas1,LID=0:IS"
;
In this response, fas1 is the signaling path, or a logical grouping of D-channels (equivalent to a linkset).
The LID is the line identifier, or the logical line ID of the D-channel within the signaling path (equivalent
to the SLC in SS7). IS is the primary service state of the D-channel.
When the D-channel is associated with an NFAS signaling path, the system returns a message similar to
the following:
Media Gateway Controller 2000-03-26 20:26:18
M RTRV
"dchan-1:nfas1,LID=0:PRI,backup=dchan-2:STBY"
;
In this response, nfas1 is the signaling path, or a logical grouping of D-channels (equivalent to a linkset).
The LID is the line identifier, or the logical line ID of the D-channel within the signaling path (equivalent
to the SLC in SS7). The next field indicates whether the specified D-channel is the primary (PRI)
channel or the standby (STBY). Finally, the backup field specifies the MML name of the D-channel that
is configured as the backup to the specified D-channel.
Note Backup D-channels are not supported for QSIG/Q.931 Over BRI Backhaul D-channels.
To retrieve the service state for all of the D-channels, log in to the active Cisco MGC, start an MML
session, and enter the following command:
rtrv-dchan:all
The system returns a message similar to the following, which shows the signaling links to and from the
Cisco MGCs and the associated media gateways (different solutions might use different media
gateways):
Media Gateway Controller 2000-03-26 19:23:23
M RTRV
"dchan1:nfas1,LID=0:IS"
"dchan2:nfas1,LID=1:IS"
"dchan3:fas1,LID=0:IS"
The valid service states for a D-channel are identical to the primary service states for signaling channels,
as found in the “Valid Service States” section on page 38. If the link is in any state other than IS, attempt
to bring the linkset into service, as described in the “Setting the Service State of a D-Channel” section
on page 33.
Retrieving the Service State for IP Links
To retrieve the service state for an individual IP link, log in to the active Cisco MGC, start an MML
session, and enter the following command:
rtrv-iplnk:iplink_name
For example, to retrieve the service state of an IP link called iplink1, enter the following command:
rtrv-iplnk:iplink1