120A CSU Test

[Avayatech713]

Have a bet going with one of our old Definity techs and need a 2nd opinion on testing procedures on the 120A CSU.

A few years ago one of my buddies who is a Definity Avaya Tier 3 tech told me the recommended test procedure to test an 120A is as follows ....

Keep in mind that the DS1 circuit isn't complete as the loopback jack isn't connected to the smartjack - this is just the procedure to test if a 120A is working or defective.

This example is using a Prologix test cabinet w/ a tested TN464F or GP in slot 01A10.

1) Connect the 120A to the back of slot A10 (always before you insert the DS1 pack as the slot 10 connetcor isn't powered up 5V to the 120A until the pack is inserted.

2) Connect the Loopback jack to the Network connector on the 120A.

3) Insert the DS1 pack - powering up the 120A.

4) Busy out slot 01A10 - it should pass

5) Run "test board 01A10 long" and if the test 1227 passes - the CSU is working.

The bet revolves around the issue that test 138 always fails which he is saying shows the 120A is defective. But the 138 test is never going to pass without a good DS1 circuit signal passing thru the other connector on the Loopback jack to the Smartjack.

Is the correct?

6) To test another 120A - the DS1 pack always needs to be removed a few inches from the cab to power down the rear connector as the 120A can be shorted if it is removed or if another 120A is installed with power to the rear A10 connector.

If anyone has a simplier or more reliable method for testing 120A CSUs ...

PS. All 120As can be tested this way - A1s thru the new A6s - on a TN464F or TN464GP?

 

[phonesrus]

Test 138 is receive from network (Yellow Alarm), Therefore if a loopback plug is inserted into the network jack on the ICSU all you are doing is sending transmit to network back to receive, which should show a pass on all tests except 144 (Sync), it will probably show slips because it is clocking off itself.
If 138 fails (yellow) or test 140 (red)fails then the ICSU is probably bad.
Test 1227 tests that the ICSU is receiving power from the switch and is only a board indicator (status)lamp test which should cycle thru when the board is inserted anyway.

I test T-1 boards and ICSU's by provisioning 2 T-1 circuits as PRI's and using a T-1 crossover cable between the ICSU's. If the "D" channels come up along with the "B's" on both then all is well.