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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/B8ZS Format)
• Alarm Detection/Insertion
• Digital PAD on Voice Signal Transmission
• Loopback Test (Local/Remote Loopback)
• 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
• Loopback Test (Local/Remote Loopback)
• Cyclic Redundancy Checking (based on ITU-T Rec. G704)
For connections of 24DTI and transmission line, twisted-pair cable can be used. For connection of
30DTI and transmission line, either coaxial cable or twisted pair cable can be used.
DCH
The D Channel Handler (DCH) provides the D Channel signaling 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.
CHAPTER 1 GENERAL INFORMATION
– 15 –
SYSTEM OUTLINE
NWA-008852-001 Rev.5.0
98ch1001.fm
JULY/01/2006
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