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Loopback testing with a smart jack
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])
Figure 26. Network interface at extended demarcation point (smart jack inaccessible) for
a 120A2 (or later) ICSU
555-233-116
6. Loopback jack
7. Dumb block (extended demarcation)
8. Network interface smart jack
9. Interface termination or fiber multiplexer (MUX)
10. Central office
Issue 4 October 2002
147
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