DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Additional Maintenance Procedures
6-19DS1 CPE Loopback Jack (T1 Only)
6
Configurations without a Smart Jack
When the loopback jack i s added to a sp an that does not contain a Smart Jac k,
the span is divided into 2 sections. See Figure 6-4 and Figure 6-5.
1. ICSU to the loopback jack.
2. Loopback jac k to the Central Office (CO).
Figure 6-4. 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