Lucent Technologies definity Installation Manual page 70

DEFINITY Enterprise Communications Server Release 6
Installation and Test for Compact Modular Cabinets 555-230-128
1 Install and Cable the Cabinets
Install and Wire Telephones and Other Equipment
DS1 Tie Trunks Using T1 Channel Service Unit
Figure 1-30
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 Lucent Technologies
representative for maximum cabling distances.
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)
Figure 1-30. Typical Connections to Channel Service Unit
shows a DS1 tie trunk connected to an external T1 Channel Service
5. Ring (R)
6. Tip 1(T1)
7. Ring1 (R1)
8. 1.544 Mbps T1 interface
9. To T1 carrier
Issue 3
May 1998
Page 1-62