Dti; Cch - NEC NEAX 2000 IVS 2 System Manual

DTI

The Digital Trunk Interface (DTI) interfaces the PBX directly to a 24/30 channel PCM
transmission line. The DTI has the following functions.
For 24-DTI:
• Unipolar/Bipolar Conversion (AMI Format/B8ZS Format)
• Signaling Insertion/Extraction
• Alarm Detection/Insertion
• Digital PAD on Voice Signal Transmission
• Loop-Back Test (Local/Remote Loop Back)
• Cyclic Redundancy Checking (based on ITU-T Rec. G704)
For 30-DTI:
• Unipolar/Bipolar Conversion (HDB3 Format)
• Signaling Insertion/Extraction
• Alarm Detection/Insertion
• Digital PAD on Voice Signal Transmission
• Cyclic Redundancy Checking (based on ITU-T Rec. G704)
• Channel Associated Signaling (based on ITU-T Rec. 0421 Digital R2 Signaling Code)
For connection of a 24-DTI and transmission line, twisted-pair cables are used, and for
connection of a 30-DTI and transmission line, twisted-pair cables or coaxial cables are used.

CCH

The Common Channel Handler (CCH) card provides a common channel signal through the DTI
to a No. 7 CCIS network, and it is responsible for signaling between the PBX and the No. 7 CCIS
network under control of the MP .
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NEAX2000 IVS CCIS System Manual
ND-70918 (E), Issue 1.0
CHAPTER 1 GENERAL INFORMATION
System Outline
Page 5