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CHAPTER 6 NDA-24305
Page 286
Revision 1.0
Q-SIG (CIRCUIT SWITCHED BASIC CALL - ETSI VERSION)
1. Q reference point
The Q reference point is not expected to be a physical interface but is shown in conceptual terms in the figure
below.
The Q-Sig protocol creates Layer 3 messages for inter-PTN (PBX) signaling.
Control Plane Protocol Model
Note:
Conforming to Q921-a (PBX-PBX Interface)
PBX
Call
Control
Protocol
Control
Data Link
Layer
Physical
Layer
PBX
Protocol
Control
Data Link
Layer
Physical
Layer
DTI DTI
QQ
Protocol defined
Layer 2 Note
in this standard
Layer 3
PBX to PBX
Call
Control