Nortel Meridian 1 Option 11C Manual page 50

Page 50 of 100 DTI/PRI Maintenance
553-3011-310 Standard 13.00
Table 9
Maintenance message and status combinations
Near-End Status
In-service
In-service
In-service
Maintenance
Out-of-service
Note: Enabling/Disabling of Service Messages must be coordinated
between the two ends. Enabling Service Messages at one end and not the
other will result in B-channels being placed out-of-service.
Message functions
Service messages are used to monitor the following:
• D-channel establishment
• D-channel sanity polling
• B-channel or ISL channel status change
• Channel status audit.
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
messaging allows the far end to synchronize its channel states. The service
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.
January 2002
Far-End Status
In-service
Maintenance
Out-of-service
N/A
N/A
B or ISL Channel
capability
Incoming and outgoing call
allowed
Incoming calls allowed only
Not allowed to use
Not allowed to use
Not allowed to use