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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 5-80Install DS1 CPE Loopback Jack (T1 Only)
5
Figure 5-15. Network Interface at “Dumb” Block with Repeater Line to Fiber
MUX
Section 2 includes the short cable from the loopback jack to the “dumb” block
demarcation point (part of the loopback jack). This is the only portion o f section
2 that is part of customer premises wiring but is not covered in the loopback
jack’s loopback path.
A problem can exist in 1 or both of the 2 sections. The field technician is
responsible for finding and correcting problems in section 1 and the loopback
cable portion of section 2. The DS1 service provider is responsible for finding
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. Repeater
8. Fiber MUX
9. Central Office