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CHAPTER 6 NDA-24305
Page 282
Revision 1.0
IS-11572 (LAYER 3 SPECIFICATIONS FOR INTER-PBX SIGNALING PROTOCOL)
(c) The connection patterns for the UUS transmission are shown in the figure below.
Pattern 1: The ISDN tandem connection
Note:
Either ISDN(a) or ISDN(b) is Q-sig/IS-11572 interface.
PBX PBX PBX
ISDN(a)
Pattern 2: The interface used in the terminating office is Q-sig/IS-11572.
Pattern 3: The interface used in the originating office is Q-sig/IS-11572.
PBX PBX
PBX PBX
Q-sig/
IS-11572
Q-sig/
IS-11572
ISDN
terminal
ISDN
terminal
ISDN
message
(UUS)
ISDN
message
(UUS)
ISDN
message
(UUS)
ISDN
message
(UUS)
ISDN
message
(UUS)
ISDN
message
(UUS)
ISDN(b)