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Feature Reference
Facility and Non-Facility Associated Signaling
Administrator’s Guide for Avaya Communication Manager
1537
November 2003
Figure 386: ISDN-PRI Configuration
With T1 (24 channel) interfaces, 2 of the ISDN-PRIs contain a D-channel and 23 B-channels, while the
other ISDN-PRI contains 24 B-channels. One of the D-channels is the Primary D-channel, and the other
is the Secondary D-channel. Together, this pair of D-channels signals for all 70 (23+24+23) B-channels
in the 3 Primary Rate Interfaces.
Since the D-channels are signaling for more than one ISDN-PRI facility, D-Channel Backup requires the
use of NFAS. At any given time, one of the two D-channels is carrying Layer 3 signaling messages, while
the other D-channel is active at layer 2, but in standby mode only. Any layer 3 messages received over the
standby D-channel are ignored. Since only one of the D-channels can be active at a time, load sharing
between the two D-channels is not possible. The two D-channels can provide signaling for only a
predefined set of B-channels and cannot dynamically backup other D-channels on other interfaces.
Figure notes
1
Avaya Media Server
2
Secondary D-Channel
3
Primary D-Channel
4
ISDN-PRI controlled by D-Channel
5
Network Far-End Switch DEFINITY
Server
Содержание Communication Manager
Страница 320: ...Setting Up Telecommuting Training Users 320 Administrator s Guide for Avaya Communication Manager November 2003...
Страница 416: ...Managing Group Communications Observing Calls 416 Administrator s Guide for Avaya Communication Manager November 2003...
Страница 502: ...Administering Media Servers SNMP Agents 502 Administrator s Guide for Avaya Communication Manager November 2003...
Страница 602: ...Phone Reference Internet Protocol IP Softphones 602 Administrator s Guide for Avaya Communication Manager November 2003...
Страница 1338: ...Screen Reference Vector Directory Number 1338 Administrator s Guide for Avaya Communication Manager November 2003...
Страница 1832: ...Glossary and Abbreviations Z 1832 Administrator s Guide for Avaya Communication Manager November 2003...
Страница 1854: ...Index X 1854 Administrator s Guide for Avaya Communication Manager November 2003...