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NEAX2000 IVS
2
ISDN System Manual
Page 10 ND-70919 (E), Issue 1.0
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.