Nortel Meridian 1 Option 11C Manual page 96

Page 96 of 100 ISL Maintenance
553-3011-310 Standard 13.00
D-channel establishment
When the D-channel establishes, the B-channel status is supported by sending
service messages for each B-channel controlled by a D-channel. This allows
the far end to synchronize its channel states. These services messages are sent
when the D-channel is brought up automatically by the system or manually
by using LD 96.
D-channel sanity polling
If a D-channel has been idle for 30 seconds, a service message is sent to poll
the sanity of the link. The service message is sent regardless of whether the
near end is configured as master or slave.
B-channel or ISL channel status change
Whenever there is a status change for a B-channel or an ISL channel, the new
status is reported to the far end via a service message. Status change can occur
through service change or maintenance operations, such as the addition or
deletion of a channel in LD 14, or disabling of the associated loop, shelf, card
or unit in LD 30, LD 32, LD 36, LD 41 or LD 60.
Channel status audit
LD 30 is enhanced to allow channel status audit to be initiated. The channels
associated with each D-channel are examined and their status is reported to
the far end via service messages.
January 2002