Nortel Meridian 1 Option 11C Manual page 95

Service and service acknowledge messages for B-channels and ISL channels
report the following statuses:
• in-service
• maintenance
• out-of-service
Near-end and far-end sub-categories are defined for each maintenance status.
See the table below for possible combinations of near-end and far-end
statuses and the channel capability for each status. When the near-end and
far-end statuses do not match, the more severe maintenance status takes effect
over the less severe maintenance status.
Table 22
Maintenance message and status combinations
Near End Status
In-service
In-service
In-service
Maintenance
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.
ISL Maintenance
Far End Status
In-service
Maintenance
Out-of-service
N/A
N/A
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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
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