Back out OC-192 to DWDM OTS span upgrade

Procedure 12-17: Back out OC-192 to DWDM OTS span upgrade

Overview

Use this procedure to back out an in-service OC-192 span to DWDM OTS span upgrade in a 1+1/UPSR network.

Backing out of an upgrade in progress returns the OC-192 span to the pre-upgrade state.

Privilege level

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

Required equipment

The following equipment is required to perform this procedure:

Optical power meter
Wrist strap
If required, the original OC-192 pluggable transmission modules.

NOTICE

Equipment damage

Rocking circuit packs back and forth when removing or installing them can damage circuit pack and/or shelf connectors.

Do not rock circuit packs back and forth when removing or installing them. Carefully slide circuit packs into or out of the shelf slot.

NOTICE

Service-disruption hazard

Removing or installing circuit packs during a System Reset can cause system errors.

Do not remove or install a circuit pack during a System Reset. If a System Reset occurs, wait until the System Reset is complete, then remove or install the circuit pack.

Before you begin

Prior to performing this procedure:

Refer to Laser safety and Electrostatic discharge information in Chapter 1, Safety.
Review the applicable Alcatel-Lucent 1665 Data Multiplexer Extend (DMXtend) Software Release Description for any detailed procedures or cautions that may apply to this backout procedure.
Determine the local operating procedures for removing optical fibers from an OC-192 port. Local operating procedures may vary. One method is to disconnect the optical fibers. Another method is to verify the OC-192 port active/standby status, perform manual switches if the OC-192 port is active, and then disconnect the optical fibers.

Steps

Important!

When optical fibers are disconnected during this procedure, inc. LOS, section DCC channel failed, and neighbor SYSCTL CP unavailable alarms are reported. The holdover mode active condition may also be reported depending on the provisioned system timing mode.

Use this procedure to back out an in-service OC-192 span to DWDM OTS span upgrade in a 1+1/UPSR network.

From office records and work instructions, determine the current network configuration. Note how the nodes are connected and make a drawing to reference during this backout procedure.

Reference:

Procedure 14-2: Connect Personal Computer (PC) and establish WaveStar^® CIT session

Determine the local operating procedures for removing optical fibers from an OC-n port before removing the required OC-192 span fibers.

If local operating procedures specify...	Then...
Verify the OC-n port active/standby status, perform manual switches if the OC-n port is active, and then disconnect the optical fibers,	Continue with the next step.
Disconnect the optical fibers,	Proceed to Step 7

Important!

If the port is active for transmission and the optical fibers are disconnected, the system performs an automatic protection switches and subsequent transmission hits (less than 60 ms) will occur. If desired, perform this step to determine the transmission state of the OC-n port.

Select View → Protection to access the required protection groups (according to the work instructions) and determine the active lines/paths supported by the OC-192 port. Record the active lines/paths supported by the OC-192 port. Click Close.

Important!

If the OC-192 port is active for transmission, optional manual switches can be performed before disconnecting the optical fiber. In UPSRs, each path supported by the OC-192 port must be switched separately. Transmission hits (less than 60 ms) will occur for each separate protection switch.

If the OC-192 port is not active for transmission, proceed to Step 7.

To perform an optional manual transmission switch to switch traffic away from an active OC-192 port, select Fault → Protection Switch.

If the required port is part of a ...	Then ...
UPSR protection group,	Expand Path Protection, select the required path and click Select. Select the Manual Switch Type and click Apply.
1+1 protection group,	Select the required 1+1 Line and click Select. Select the Manual Switch Type and click Apply.

Result:

A dialog box appears asking you to confirm executing this command. Click Yes.

The ABN LED is lighted on the SYSCTL circuit pack faceplate.

If a UPSR or 1+1 protection group, the system reports a manual switch condition.

If required, repeat Step 4 to verify that the OC-192 port is not active for transmission; otherwise, continue with the next step.

NOTICE

Service-disruption hazard

Removing the wrong fiber connections will result in a service interruption.

Using the work instructions, ensure that you remove only the fiber connections for the optical span being upgraded.

NOTICE

Service-disruption hazard

Disconnecting the optical fiber from the OMD circuit pack OTS port will result in a service interruption if OCH ports are carrying traffic.

Using office records, determine if any OCH ports, in addition to the OCH port being backed out, are carrying traffic. If any OCH ports, in addition to the OCH port being backed out are carrying traffic, do not disconnect the optical fiber from the OTS port.

Important!

If an OC-192 port connected to the OMD circuit pack is active for transmission, disconnecting the optical fibers from the OTS port of the OMD circuit pack causes transmission switches. Transmission hits (less than 60 ms) will occur for each separate protection switch.

If required, disconnect the DWDM span fibers from the OTS port of the OMD circuit pack.

Result:

Transmission hits (less than 60 ms) may occur if traffic exists on the OC-192 port. If through traffic exists (UPSRs only), transmission hits (less than 60 ms) may occur at the nodes where the traffic is added/dropped.

The system reports inc. LOS alarms when the DWDM span fibers are disconnected.

Alarms may also be reported at other nodes in the network.

Log in to the node at the opposite end of DWDM span to be backed out and repeat Step 3 through Step 7. Then continue with the next step.

Disconnect the optical fibers between the OLIU OC-n port and OMD OCH port, and remove the OC-n signal from the DWDM network.

Reference:

Procedure 10-15: Delete optical channel (OCH) from DWDM network

If required at the terminating nodes, remove the OLIU DWDM pluggable transmission module and install the original OC-n pluggable transmission module.

Reference:

Procedure 4-16: Install pluggable transmission modules

If required at the terminating nodes, provision the original OC-n pluggable transmission module parameters according to office records.

Reference:

Procedure 4-19: Provision pluggable transmission module

Obtain the original LBO, clean all fiber connectors, and connect the transmit and receive OC-n span fibers to the original OLIU circuit pack OC-n port.

Result:

The inc. OCN LOS alarms clear. Transmission is now supported on the original optical span.

Reference:

Procedure 14-3: Clean optical fibers, dual LC adapters and LC lightguide buildouts (LBOs)

If required at the terminating nodes, remove the OMD circuit packs from the shelf and select Configuration → Update System → Update Inventory.

At each terminating node, click the Alarm List button in the top right corner of the System View to view the NE Alarm List and verify that no alarms or standing conditions are present.

Refer to the appropriate trouble clearing procedures to clear all existing alarms and standing conditions.

Reference:

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

End of steps