Loopback testing with a smart jack
Issue 4 October 2002 147555-233-116
Figure 26. Network interface at extended demarcation point (smart jack inaccessible) for
a 120A2 (or later) ICSU
1. Span section 1
2. Span section 2
3. Span section 3
4. 120A2 (or later) ICSU
5. RJ-48 to network interface
(up to 1000 ft. [305 m])
6. Loopback jack
7. Dumb block (extended demarcation)
8. Network interface smart jack
9. Interface termination or fiber multiplexer (M UX)
10. Central office