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Testing a loopback jack without a smart jack
Issue 4 October 2002
151555-233-116
Testing a loopback jack without a
smart jack
When the loopback jack is added to a span that does not contain a smart jack, the
span is divided into 2 sections: from the ICSU, or from the MM710, to the
loopback jack and from the loopback jack to the central office (CO). Section 2
includes the short cable from the loopback jack to the dumb block demarcation
point (part of the loopback jack). This cable is the only part of Section 2 that is part
of customer premises wiring. It is not covered in the loopback jack’s loopback
path. See Figure 30 through Figure 33.
Figure 30. Network interface at “dumb” block for a 120A2 (or later) ICSU
1. Span section 1
2. Span section 2
3. 120A2 (or later) ICSU
4. RJ-48 to network interface
(up to 1000 ft. [305 m])
5. Loopback jack
6. Dumb block (demarcation point)
7. Interface termination or fiber multiplexer (MUX)
8. Central office