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CHAPTER 1 GENERAL INFORMATION
Outline of Event Based CCIS
NEAX2000 IVS
2
ISDN System Manual
ND-70919 (E), Issue 1.0
Page 15
Common Channel and Voice Channel Link Control
When the call is a regular ISDN call or when there is no call on the PBX, the common signaling
channel and the voice channel for the virtual tie lines are disconnected.
If the virtual tie lines are all busy or when the virtual tie lines cannot be connected due to a line
fault, a call is transmitted to the opposite office via ISDN network as a regular ISDN call, not as
a CCIS call.
When a predetermined time passes after all calls finish, the voice channels and common
signaling channel are released and the CCIS link is disconnected. The release timer is set by
system data programming for the common signaling channel and voice channels.
Figure 1-8 Release Timing of Virtual Tie Line and CCIS Link
Release VT (B1)
Release VT (B3)
Release VT (B2)
Release CCIS (B3)
Release CCIS (B2)
Set VT (B3)
Set VT (B1)
Voice ch 1 (B2)
Voice ch 2 (B3)
CCIS link (B1)
n sec.
n sec.
m sec.
Set VT (B2)
n, m: Release timer
2.4 seconds-max. 28 minutes
VT: Virtual Tie Line