Avaya Media Gateway G350, Maintenance Manual

Page: 136 / 332

Avaya Communication Manager controlled maintenance
ISDN-LNK (ISDN-PRI Signaling Link Port)
136 Maintenance of the Avaya G350 Media Gateway
June 2004
ISDN-LNK (ISDN-PRI Signaling Link Port)
The ISDN-PRI interface uses out-of-band signaling (as opposed to robbed-bit, in-band signaling) to
transmit control messages between two endpoints. User information channels carry digitized voice and
digital data and are known as bearer channels (B-channels). B-channels are assigned to DS1 ISDN trunks
or PRI endpoints. Call control signaling for the B-channels is combined and carried over the separate
ISDN-PRI Signaling Link Port D-channel.
The ISDN-PRI Signaling Link Port (ISDN-LNK) is a port on a MM710, which has a direct interface to
the packet bus which carries D-channel messages to the processor. The associated B-channels can use
ports on the same Media Module or ports on other MM710s.
Two types of DS1 interfaces exist:
•
24 DS0 channels on a 1.544 Mbps link
•
31 DS0 ch 1 framing channel on a 2.048 Mbps link
On 24-channel interfaces, the B-channels may use any of the first 23 ports. The signaling link is assigned
to the 24th port. On 32-channel interfaces, the DS1 ISDN Trunks (B-channels) may use any of ports 1 to
15 and 17 through 31. The signaling link is assigned to the 16th port. The 32nd channel (port 0) is used
for framing. In NFAS configurations, the 24th or 16th ports on some of the DS1 Media Modules may be
used for B-channels. Refer to ISDN-SGR for further information.
A problem with the ISDN-LNK will have an effect on all of the associated B-channels since without it no
call control information can be conveyed to the far-end switch or terminal adapter. Stable calls may
remain operational, but no new calls can be made. The ISDN-LNK in turn depends on the MM710 it
resides on which provides the link to the processor. If there are problems with the ISDN-LNK, also
investigate the MM710 Interface Media Module (MG-DS1).
Table 74: ISDN-LNK (ISDN-PRI Signaling Link Port)
MO Name (in
Alarm Log) Alarm
Level Initial Command to
Run*
Full Name of MO
ISDN-LNK** MINOR test port GGGVSpp l ISDN-PRI Signaling
Link Port
ISDN-LNK WARNING test port GGGVSpp sh ISDN-PRI Signaling
Link Port
*pp is 24 for 24-channel interfaces and 16 for 32-channel interfaces.
Note: You must consult local records for the location and designation of the equipment rack
where the G350 is mounted.
**For additional related information, see USD1-BD and MG-DS1 MOs.