Avaya 555-233-116 manual Administering the loopback jack, Loopback testing with a smart jack

Administering the loopback jack

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 24, through Figure 29):

■From the 120A2 (or later) ICSU, or from the MM710, to the loopback jack

■From the loopback jack to the smart jack (network interface point)

■From the smart jack to the CO

The first 2 sections are your responsibility. The last is the responsibility of the DS1 service provider.

Testing the DS1 span from the ICSU to the loopback jack

The DS1 span test has 2 parts.

■Checking for circuit connectivity

The first part of the test powers-up the loopback jack and sends a signal from the DS1 circuit pack, through the wiring, to the loopback jack. The test allows about 10 seconds for the signal to loop around the loopback jack and return to the DS1 circuit pack. Then it sends the results to the management terminal and proceeds to the second part of the test.

■The second part of the test sends the standard, 3-in-24 DS1 stress-testing pattern from the DS1 board, through the loopback jack, and back to a bit error detector and counter on the DS1 board. A bit-error rate counter displays the results on the management terminal until you terminates the test.

Always perform both parts of the test. Proceed as follows.

555-233-116 Issue 4 October 2002 137