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DS1 protection switching

DS1 function unit protection switching test (manual)

While a VT cross-connection exists, and a test set is connected, path switching will be

verified.

Use this procedure to test all of the Function unit Slots occupied by a

LNW6/LNW7/LNW8 (DS1) circuit pack.

Note:

arrangement. It is not mandatory to perform this test on each VT cross-connection,

however this procedure should be performed on each Function unit Slot pair.

Procedure

Proceed as follows:

Locate the Function Group equipped with the DS1 circuit pack.

Determine the system is alarm free by clicking on the Alarm List button on the system

view.

Unseat the active circuit pack. The active circuit pack has an ACTIVE LED lit. Monitor

the test set connected to the DSX patch panel.

Result:

The MN alarm and the NE LED lamps on the SYSCTL will light.

Transmission at the test set will take a momentary hit and then re-establish.

Confirm that there is a CP Removed alarm by clicking on the Alarm List button on the

system view.

Unseat the second circuit pack of the pair.

Result:

will be registering continuous bit errors and indicate AIS alarm.

Reseat the first circuit pack that was removed.

365-372-304R7.1

Issue 2 March 2008

This test is performed when the DS1 circuit packs are in a 1x1 protection

The ACTIVE LED on the other circuit pack in the Function Group will light.

On the SYSCTL, the MN alarm extinguishes and the CR alarm lights. Test set

DS1 protection switching

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Ds1 Protection Switching - Alcatel-Lucent 1665 Installation Manual