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326 Installation, Upgrades and Additions for Avaya CMC1 Media Gateways
Without a smart jack
Install the loopback jack at the point where the cabling from the ICSU plugs into the dumb block.
If there is more than one dumb block, choose the one that is closest to the Interface Termination
feed or the fiber MUX to provide maximum coverage for loopback jack tests. Refer to
Figure 105
and Figure 106.
1. To install the loopback jack, simply disconnect the RJ-48 (8-wide) connector at the
appropriate interface point and connect the loopback jack in series with the DS1 span. See
Figure 102
through Figure 106.
2. Plug the H600-383 cable from the ICSU, or from the MM710, into the female connector on
the loopback jack.
3. Plug the male connector on the loopback jack cable into the network interface point.
Note:
Note: Do not remove the loopback jack after installation. This is not a test tool and
should always be available to remotely test a DS1 span.
Administering the loopback jack
1. At the management terminal, enter change ds1 location, where location is the DS1
interface circuit pack corresponding to the loopback jack.
2. Be sure the near-end CSU type is set to integrated.
3. On page 2 of the form, change the supply CPE loopback jack power field to y.
Setting this field to y informs the technician that a loopback jack is present on the facility
and allows the technician to determine that the facility is available for remote testing.
4. Enter save translation to save the new information.
Loopback testing with a smart jack
The loopback jack and smart jack isolate faults by dividing the DS1 span into 3 sections (see
Figure 102
through Figure 104):
● From the 120A2 (or later) ICSU to the loopback jack
● From the loopback jack to the smart jack (network interface point)
● From the smart jack to the CO
The first two sections are your responsibility. The last is the responsibility of the DS1 service
provider.