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NDA-24305 CHAPTER 6
Page 191
Revision 1.0
D-CHANNEL BACKUP - PRI
D-152 D-CHANNEL BACKUP - PRI
1. General Description
D-channel Backup feature is available in Non-Facility Associated Signaling (for AT&T/NT/N-ISDN2).
• Changeover to Backup D-channel automatically executes when a link of ACT D-channel is down.
• You can change D-channel from ACT to Backup by using MAT (The command CDBU).
• Both Primary D-channel and Backup D-channel must be located in the same LP.
Note:
Primary Dch must be given the interface ID=0 and Backup Dch must be given the interface ID=1 by the
ISDN provider (CO.)
2. Operating Procedure
• No manual operation is required. (Automatic changeover)
• By the command CDBU of MAT.
Note:
When a changeover, a System Message “23-P” or “23-Q” is output.
3. Programming
STEP 1: Assign the numbering (LCR) data to access to ISDN.
STEP 2: ARTD - Assign the route data. (Refer to “Chapter 3”)
- CDN115 (CMRT)=1 to both Bch and Dch.
Note:
This step is necessary when you give a common route number to all B-channels.
The circuit cards used to assign a Common Route should be accommodated in the same LP.
PRT
23B+D
Bch: RT20
Dch: RT21
PRT
24B
PRT
23B+D (Backup Dch)
ISDN
Non-Facility Associated Signaling