CHAPTER 1 GENERAL INFORMATION
– 7 – NWA-008853-001 Rev.3.0
97ch1001.fm
DTI
The Digital Trunk Interface (DTI) interfaces the 2000 IPS directly to a 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
• 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 connection of a 24DTI and transmission line, twisted-pair cables are used, and for connection of a
30DTI and transmission line, twisted-pair cables or coaxial cables are used.
CCH
The Common Channel Handler (CCH) card provides a common channel signaling 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.
CCT
The CCIS trunk (CCT) provides a 24/30-channel Digital Trunk Interface (DTI) and a built-in CCH with
the functions described above.
SYSTEM OUTLINE
To Next Page
Loading...
