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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 5-78Install DS1 CPE Loopback Jack (T1 Only)
5
Figure 5-13. Network Interface at Extended Demarcation Point (Smart Jack
Accessible)
Configurations Without a Smart Jack
When the loopback jack is added to a span that does not contain a Smart Jack,
the span is divided into 2 sections. See Figure 5-14
and Figure 5-15.
1. ICSU to the loopback jack.
2. Loopback jack to the Central Office (CO).
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. “Dumb” Block (Extended Demarcation)
7. Loopback Jack
8. Network Interface Smart Jack
9. Interface Termination or Fiber MUX
10. Central Office
11. “Dumb” Block to Smart Jack RJ-48