CHAPTER 1 GENERAL INFORMATION
ā 9 ā NWA-008853-001 Rev.3.0
97ch1001.fm
No. 7 CCIS
The PBX can provide No. 7 CCIS via either a digital network or an analog network. Regardless of the dig-
ital network or analog network, CCH (Common Channel Handler) to control the common signaling chan-
nel is required.
Digital Network
When No. 7 CCIS is provided via a digital network, the CCH is connected to the DTI by a fixed path in
the TDSW and transmits/receives common signaling data to/from the distant office through a predeter-
mined channel. Voice signals are transmitted/received on each line basis through other channels.
This figure shows the system configuration of No. 7 CCIS provided via digital network.
No. 7 CCIS with DTI
TDSW
2000 IPS/2400 IPX
DTI/
24/30 CHANNEL PCM
DIGITAL LINE
DTI/
CCH
TDSW
2000 IPS
DTI : 24/30 Channel Digital Trunk Interface
CCH: Common Channel Handler
CCT : CCIS Trunk
PLO : Phase Locked Oscillator
MP
(PLO)
MP
CCH
CCTCCT
SYSTEM OUTLINE
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