NDA-24305 CHAPTER 6
Page 277
Revision 1.0
IS-11572 (LAYER 3 SPECIFICATIONS FOR INTER-PBX SIGNALING PROTOCOL)
I-42 IS-11572 (LA YER 3 SPECIFICATIONS FO R INT ER-PBX SIGNALING PR OTOCOL)
1. General Description
This feature allows inter-PBX link using Layer 3 signalling protocol supporting circuit mode bearer services
(ISO/IEC IS-11572). This feature has the following functions:
• Outgoing/Incoming Call Connection
• Tandem Connection
• Inter-PBX Link
This feature is available fo r the PBX with the PA-30 PRTC circuit card.
1. Physical Interface
A maximum of 63 channels a re to be controlled by a single Data Link channel. This feature, however, does
not support D-CHANNEL BACKUP.
PBX PBX
PRT PRT
IS-11572
(
Private ISDN
)
42B+D
Logical interface
Logical interface
DTI
DTI
PBX
4B+D
Legend: : D-channel
: B-channel