– 271 – NWA-008845-001 Rev.5.0
32ch1005.fm
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 24DTI:
• Unipolar/Bipolar Conversion (AMI Format)
• Signaling Insertion/Extraction
• 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)
• Signaling Insertion/Extraction
• Alarm Detection/Insertion
• Digital PAD on Voice Signal Transmission
• Loopback Test (Local/Remote Loopback)
• Cyclic Redundancy Checking (based on ITU-T Rec. G704)
• Channel Associated Signaling (based on ITU-T Rec. Q421 Digital R2 Signaling Code)
For connection of a 24DTI and transmission line, twisted-pair cables can be used. For connection of a
30DTI and transmission line, either coaxial cable or twisted pair cable can be used.
JULY/01/2006
DIRECT DIGITAL INTERFACE
DTI
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