CHAPTER 3 NDA-24296
Page 172
Revision 1.0
PA-CFTB
8-party Conference Trunk

PA-CFTB

8-party Con fe ren ce Trunk

1. General Function
The PA-CFTB (CFT) circuit card provides an interface for establis hi n g a conferenc e, wh ich i s made up of
a maximum of eight parties.
A maximum of seven Tie Lines can participate in a conference when the asso ciated trunks can receive an
answer signal and a release signal from the distant switching system. On the other hand, in the case of a
C.O. line, one C.O. line can be conne cted even if the p ublic swit ching sys te m cannot send a n answer signal
and/o r rele ase signal. Not e that a T ie Line and a C.O. Li ne cannot t ake part in a conference at th e same ti me.
The card adopts N-1 addition method for establishing a conference.
Note: This circ uit card is used for following features:
Station-Controlled Conference (Refe r to Feature Programming Manual [S-56])
Attendant-Controlled Conference (Refer to Feature Programming Manual [A-2])
Add On Conference- 8 Party (Refe r to Feature Programming Manual [A- 121])
Gro up Ca l l -A u tom a t i c C o n f er en ce (20-p a r t y) (Refe r t o Wire less Syst e m M anual)
Figure 3-1 Location of PA-CFTB ( CFT) within the System
NETWORK
Answer/Release Signal
Conferee
Conference
Originator
CPU
Local I/O Bus
GT
INT SW INT PA-CFTB
7
6
5
4
3
2
1
0
PCM INT
VPROC
PCM INT: PCM Interface
VPROC: Voice Processor Block
TLT
TLT
LC
LC
CH
This diagram shows an example of a Preset conference involving Tie Line connections.