Avaya 555-233-116 - Manual (Page 151)

Testing a loopback jack without a smart jack
Issue 4 October 2002 151 555-233-116
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