Dti; Dch; Prt - NEC Neax 2000 IVS2 Manual

CHAPTER 1 GENERAL INFORMATION
System Outline

DTI

The Digital Trunk Interface (DTI) interfaces the PBX directly to 24/30-channel PCM transmission
line. The DTI has the following functions:
For 24DTI:
• Unipolar/Bipolar Conversion (AMI Format/B8ZS Format)
• 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 30DTI:
• Unipolar/Bipolar Conversion (HDB3 Format)
• Alarm Detection/Insertion
• Digital PAD on Voice Signal Transmission
• Cyclic Redundancy Checking (based on ITU-T Rec. G704)
For connections of a 24DTI and transmission line, twisted-pair cable can be used. For connection
of a 30DTI and transmission line, either coaxial cable or twisted-pair cable can be used.

DCH

The D Channel Handler (DCH) provides the D Channel signalling interface through the DTI to an
ISDN exchange, and it is responsible for signaling between the PBX and the ISDN exchange
under control of the system MP .

PRT

The Primary Rate Interface Trunk (PRT) provides the ISDN Primary Rate Interface (1.5 Mbps
PCM-23B + D) and a built-in DCH. The PRT has the following functions:
• Unipolar/Bipolar Conversion (AMI Format/B8ZS Format)
• 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 connections of PRT and transmission line, twisted-pair cable can be used.
NOTE: ISDN requires B8ZS line coding with Extended Superframing (ESF) Format.
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NEAX2000 IVS ISDN System Manual
ND-70919 (E), Issue 1.0