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DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Routine Maintenance Procedures
Page 5-77Install DS1 CPE Loopback Jack (T1 Only)
5
Figure 5-12. Network Interface at Extended Demarcation Point (Smart Jack
Inaccessible)
Figure Notes:
1. Span Section 1
2. Span Section 2
3. Span Section 3
4. 120A2 (or later) Integrated
Channel Service Unit (ICSU)
5. RJ-48 to Network Interface
(Up to 1000 Feet) (305 m)
6. Loopback Jack
7. “Dumb” Block (Extended Demarcation)
8. Network Interface Smart Jack
9. Interface Termination or Fiber MUX
10. Central Office