Testing A Loopback Jack With A Smart Jack; Testing The Ds1 Span From The Mm710 To The Loopback Jack; Checking The Integrity Of Local Equipment - Avaya G450 Installing And Upgrading

2. Verify that 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.

Testing a loopback jack with a smart jack

The loopback jack and smart jack isolate faults by dividing the DS1 span into three sections
(see Figure 148
These three sections are:
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 two sections are your responsibility. The last is the responsibility of the DS1 service
provider.

Testing the DS1 span from the MM710 to the loopback jack

The DS1 span test has 2 parts:
Checking for circuit connectivity between the DS1 circuit pack and the loopback jack.
●
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 terminate the test.
Always perform both parts of the test. Proceed as follows.

Checking the integrity of local equipment

Before you go any further, make sure that the problem is actually on the DS1 span by testing
the equipment that connects to the span at the near end. Test the DS1 circuit pack, and perform
any needed maintenance or repairs.
through Figure 150).
DS1/T1 CPE loopback jack
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