Perform DS3 transmission test

Procedure 14-10: Perform DS3 transmission test

Overview

Use this procedure to test a DS3 port at a stand-alone Alcatel-Lucent 1665 DMXtend shelf or in an Alcatel-Lucent 1665 DMXtend network.

If this procedure is being used to perform end-to-end testing in an Alcatel-Lucent 1665 DMXtend network, it is assumed that the complete Alcatel-Lucent 1665 DMXtend network configuration (UPSR, 1+1, or Bidirectional 1+1) has already been established/tested and that only a particular DS3 port is being tested at this time.

In end-to-end testing, one shelf is referred to as the near end and the other shelf as the far end. These designations are arbitrary; either shelf can be the near-end or the far-end shelf.

Important!

The LNW18 TMUX, LNW19/19B 48DS3EC1, and LNW20 48TMUXDS3EC1 circuit packs do not support internal DS3 port transmission tests. If the near end is equipped with an LNW18, LNW19/19B, or LNW20 circuit pack, use a DS3 test set to apply a DS3 test signal.

Important!

The Port Maintenance parameter for the affected ports must be provisioned Allow to perform this procedure. If the Port Maintenance parameter for the affected ports is provisioned to Inhibit, loopback and test transmission commands for the affected ports are denied.

To view the Port Maintenance parameter, a Privileged, General, Maintenance, or Reports Only user must select Administration → Allow/Inhibit Port Maintenance to access the required port.

To provision the Port Maintenance parameter, a Privileged user must perform Procedure 7-23: Allow/inhibit port/tributary maintenance.

Privilege level

You must log in as either a Privileged or General user to complete this procedure.

Required equipment

In addition to the equipment listed in Required equipment, a DS3 Test Set is also required.

Before you begin

Prior to performing this procedure:

Refer to Before you begin in this chapter.
Refer to Electrostatic discharge in Chapter 1, Safety.
Obtain the work instructions for this procedure and note the assigned AIDs.
Select View → Equipment to access the required DS3 port and verify that the DS3 port parameters have been provisioned correctly (according to the work instructions), at the terminating Alcatel-Lucent 1665 DMXtend shelf(s) of the circuit being tested.

If desired to prevent incoming signal alarms during the transmission test, provision the port Signal Format parameter Clear Channel and the Alarm Indication Signal parameter No AIS.

If required, select Configuration → Equipment to make DS3 port provisioning changes.

Refer to Procedure 4-8: Provision DS3/EC1 circuit packs/ports for service for more information.
If testing a DS3 port on an LNW39 DS1/DS3/16/3 or LNW111 3DS3 circuit pack, select View → Equipment to access the DS3 port and verify that the DS3 port Signal Format parameter is provisioned to Clear Channel and the Alarm Indication Signal parameter is provisioned to No AIS.

If required, select Configuration → Equipment to make DS3 port provisioning changes.

Refer to Procedure 4-8: Provision DS3/EC1 circuit packs/ports for service for more information.
If testing a DS3 port on an LNW39 DS1/DS3/16/3 or LNW111 3DS3 circuit pack, select View → Loopbacks to verify that no terminal loopbacks exist on the circuit pack. The DS3 test is denied if a terminal loopback exists on the circuit pack.

If required, select Fault → Analysis → Loopback to make changes.

Steps

Complete the following steps to perform the DS3 transmission test.

Important!

Proper terminating and pass-through cross-connections must exist at each shelf (including stand-alone shelves) to establish the continuity for the DS3 circuit being tested.

Select View → Cross-Connections to obtain a cross-connection list and verify that the proper STS-1 cross-connections exist for the DS3 circuit to be tested.

If required, select Configuration → Cross-Connections to access the Cross-Connection Wizard and create the proper STS-1 cross-connections for the DS3 circuit to be tested

Reference:

Alcatel-Lucent 1665 Data Multiplexer Extend (DMXtend) TL1 Message Details, 365-372-328

If the DS3 transmission test is to be performed...

Then...

at a stand-alone shelf in the Terminal direction (toward the fiber),

At the required OLIUs, loop back the fiber.

Refer to Procedure 14-6: Connect OLIU optical loopbacks.

in an Alcatel-Lucent 1665 DMXtend network (end-to-end)

At the far-end DSX-3 panel or equivalent connection point, connect a patch cord from the OUT jack to the IN jack associated with the DS3 circuit being tested, OR log in to the far-end Alcatel-Lucent 1665 DMXtend shelf and select Fault → Analysis → Loopback to perform a Terminal loopback on the DS3 circuit being tested.

Important!

The LNW19/19B 48DS3EC1 circuit pack does not support terminal loopbacks.

Reference:

The following figures show the test arrangements.

Figure 14-11: Stand-Alone shelf with OLIU loopback

Figure 14-12: End-to-End DS3 circuit with far-end loopback

At the near end, select Fault → Test → Transmission to perform a terminal transmission test on the DS3 port, or connect a DS3 test set to the port to be tested at the DSX-3 panel or equivalent connection point and apply a DS3 test signal.

Important!

Was the test successful (error free)?

If...	Then...
Yes,	Continue with Step 5.
No,	Proceed to Step 21.

Is the protection slot associated with the DS3 circuit under test equipped with a companion DS3 circuit pack?

If...	Then...
Yes,	Continue with Step 6.
No,	Proceed to Step 9.

Select Fault → Protection Switch to perform a manual switch from the current active circuit pack to the standby circuit pack. This may cause a hit and register some errors during the switch.

Was the circuit pack protection switch successful (recovered error free)?

If...	Then...
Yes,	Verify that the Standby circuit pack is now Active, and repeat Step 3 for the protection circuit pack. Then continue with Step 8.
No,	Proceed to Step 21.

Was the test successful (error free)?

If...	Then...
Yes,	Continue with Step 9.
No,	Proceed to Step 21.

Are you performing this test for a stand-alone Alcatel-Lucent 1665 DMXtend shelf or for end-to-end testing within an Alcatel-Lucent 1665 DMXtend network?

If...	Then...
Stand-alone test,	Continue with Step 10.
End-to-end test,	Proceed to Step 15.

Remove the fibers used to loop back the circuit under test and disconnect the DS3 test set from the DSX-3 panel or equivalent connection point, if required.

Delete any cross-connections entered to perform this procedure.

Reference:

Procedure 10-4: Discontinue DS3 or EC-1 service

In the System View screen, select Configuration → Update System → Update All to retire existing alarms caused by this procedure.

If required, repeat Step 1 through Step 12 for each DS3 circuit to be tested.

STOP! End of Procedure.

At the near end, disconnect the DS3 test set from the DSX-3 panel or equivalent connection point, if required.

At the near end and far end, delete any cross connections entered to perform this procedure.

Reference:

Procedure 10-4: Discontinue DS3 or EC-1 service

At the far end, select Fault → Analysis → Loopback to release the terminal loopback, or remove the patch cords at the DSX-3 panel or equivalent connection point for the circuit under test.

At the near end and far end, select Configuration → Update System → Update All to retire existing alarms caused by this procedure.

If required, return to Step 1 and repeat this procedure for each DS3 circuit to be tested.

STOP! End of Procedure.

Has the DS3 circuit pack that failed this test been replaced?

If...	Then...
Yes,	Proceed to Step 23.
No,	Continue with Step 22.

Replace the DS3 circuit pack and repeat this procedure.

Reference:

Alcatel-Lucent 1665 Data Multiplexer Extend (DMXtend) Alarm Messages and Trouble Clearing Guide, 365-372-326

Trouble may be in the DSX cross-connect wiring, T3 interface wiring, STS-1 cross-connections in the network, or the shelf backplane. If you continue to experience problems, contact your next level of support.

Reference:

Alcatel-Lucent 1665 Data Multiplexer Extend (DMXtend) Alarm Messages and Trouble Clearing Guide, 365-372-326

End of steps