D-Channel Backup - Pri - NEC NEAX 2400 IPX Programming Manual

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.
When a changeover, a System Message "23-P" or "23-Q" is output.
Note:
3. Programming
STEP 1: Assign the numbering (LCR) data to access to ISDN.
STEP 2: ARTD - Assign the route data. (Refer to
- CDN115 (CMRT)=1 to both Bch and Dch.
This step is necessary when you give a common route number to all B-channels.
Note:
The circuit cards used to assign a Common Route should be accommodated in the same LP.
Non-Facility Associated Signaling
23B+D
PRT
24B
PRT
23B+D (Backup Dch)
PRT
NDA-24305
Bch: RT20
Dch: RT21
"Chapter 3")
D-CHANNEL BACKUP - PRI
ISDN
CHAPTER 6
Page 191
Revision 1.0