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Install and Wire Telephones and Trunks
Issue 10 June 2005 91
DS1 Tie Trunks Using T1 Channel Service Unit
Figure 36 shows a DS1 tie trunk connected to an external T1 Channel Service Unit (CSU). A
120A2 enhanced Integrated Channel Service Unit (ICSU) can be used in place of a T1 external
CSU. The CSU or ICSU interfaces the DS1 tie trunks with the 1.544 Mbps digital facility.
Contact your Avaya Inc. representative for maximum cabling distances.
Figure 36: Typical Connections to Channel Service Unit
3-Pair and 4-Pair Modularity
Figure 37 shows 3-pair and 4-pair modularity from the port circuit pack to the voice or data
terminal. Most terminals connect to an information outlet (modular jack) installed at the work
location.
Figure notes:
1. To DS1 tie trunk circuit pack
2. C6C cable (If distance is over 50 feet
(15.24 m), use C6E cable.)
3. T1 external CSU or 120A2 ICSU
4. Tip (T)
5. Ring (R)
6. Tip 1(T1)
7. Ring1 (R1)
8. 1.544 Mbps T1 interface
9. To T1 carrier