Back out OC-n to DWDM OTS span upgrade

Procedure 12-28: Back out OC-n to DWDM OTS span upgrade

Overview

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

Backing out of an upgrade in progress returns the OC-n 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-n pluggable transmission modules.

NOTICE

Equipment damage hazard

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 (DMX) 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-n port. Local operating procedures may vary. One method is to disconnect the optical fibers. Another method is to verify the OC-n port active/standby status, perform manual switches if the OC-n 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.

When optical fibers are connected in a BLSR during this procedure, Default K-bytes alarms are reported temporarily.

Use this procedure to back out an in-service OC-n span to DWDM OTS span upgrade in a 1+1/UPSR/BLSR 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-n 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-n port. Record the active lines/paths supported by the OC-n port. Click Close.

Important!

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

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

To perform an optional manual transmission switch, 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.
BSLR protection group,	Select the required 2F BLSR line and click Select. Select the Direction for the circuit pack to be replaced (West for slot 1 or East for slot 2) and Manual to Protection, Ring 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 a BLSR protection group, the system reports the Protection Switch, OC48 Port, Manual Switch, MSR, 2F condition (Not Alarmed).

If required, repeat Step 4 to verify that the OC-n 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-n port connected to the XM10G/8 and OMD circuit pack or directly 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 required 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-n port. If through traffic exists (UPSRs and BLSRs 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.

For BLSR protection groups, the system also reports a Line Automatic Switch condition for the OC-n port.

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.

If the OLIU circuit pack OC-n port is connected to an...

Then...

OMD circuit pack OCH port,

Perform Procedure 10-16: Delete optical channel (OCH) from DWDM network to disconnect the optical fibers and remove the optical channel from the DWDM network.

XM10G/8 circuit pack OC-n client port,

Perform the following:

Disconnect the optical fibers between the OLIU OC-n port and XM10G/8 client port, and remove the OC-n client signal from the DWDM network. Refer to Procedure 10-18: Delete SONET/GbE/Data client signal.
If required, disconnect the optical fibers between the XM10G/8 OTU2 port and OMD OCH port, and remove the optical channel from the DWDM network. Refer to Procedure 10-16: 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 4-15: 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 XM10G/8 and/or 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 (DMX) Alarm Messages and Trouble Clearing Guide, 365-372-302

End of steps