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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 5-79Install DS1 CPE Loopback Jack (T1 Only)
5
Figure 5-14. Network Interface at “Dumb” Block
Figure Notes:
1. Span Section 1
2. Span Section 2
3. 120A2 (or later) Integrated
Channel Service Unit (ICSU)
4. RJ-48 to Network Interface
(Up to 1000 Feet) (305 m)
5. Loopback Jack
6. “Dumb” Block (Demarcation Point)
7. Interface Termination or Fiber MUX
8. Central Office