The status of these messages is reported by the service and service acknowledge messages
for B-channels and ISL
channels:
• in-service
• maintenance
• out-of-service
Near-end and far-end subcategories are defined for each maintenance status. See
Table 72:
Maintenance message status on page 148
for possible combinations of near-end and far-end
status, and channel capability for each status. When the status of the near-end and far end
does not match, the more severe maintenance status takes effect.
Table 72: Maintenance message status
Near-end status Far-end status B channel capability
In-service In-service both incoming and outgoing
calls allowed
In-service Maintenance only incoming calls allowed
In-service Out-of-service not allowed to use
Maintenance N/A not allowed to use
Out-of-service N/A not allowed to use
Service message function
Service messages are used to monitor the following:
•
D-channel establishment
• D-channel sanity polling
• B-channel or ISL 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 enables the far end to
synchronize its channel states. The service messages are sent when the system brings up the
D-channel automatically or an administrator brings up the D-channel manually by using LD
96.
2.0 Mb PRI maintenance
148 ISDN Primary Rate Interface Maintenance November 2011
Comments? infodev@avaya.com
To Next Page
Loading...
Need help?
General
