Avaya 555-233-116 manual Testing a loopback jack without a smart jack

Testing a loopback jack without a smart jack

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.

1.	Span section 1	5.	Loopback jack
2.	Span section 2	6.	Dumb block (demarcation point)
3.	120A2 (or later) ICSU	7.	Interface termination or fiber multiplexer (MUX)
4.	RJ-48 to network interface	8.	Central office
	(up to 1000 ft. [305 m])

Figure 30. Network interface at “dumb” block for a 120A2 (or later) ICSU

555-233-116 Issue 4 October 2002 151