Precautions for Routine Maintenance

Switching off Laser

Looping Back Optical Port

When fiber jumpers are used to loopback an optical port that has ASON services, first transfer the ASON services to other ASON trails. If the optical port has no services, lock out the ASON trails that pass the optical port by setting the Rerouting Lockout attribute of the trails to Locked. If the service cannot be transferred to another trail, you can change the service to a static service. In this case, loopback at the optical port causes service interruption.

NOTICE:

Optimization of ASON service at the optical layer on the WDM equipment causes service interruption for a long time.

Inserting or Removing Fibers

Before inserting or removing fibers at an optical port with ASON services, transfer the ASON services to other trails. If the optical port has no actual services, lock the ASON trails that pass the optical port by setting the Rerouting Lockout attribute of the trails to Locked.

NOTICE:

• Do not frequently insert or remove fibers at an optical port that has TE links.
• Do not remove or insert fibers on an optical port with services running.

Replacing and Resetting the SCC Board

The ASON software runs on the SCC board and saves network data in real time. Hence, the NE cannot run normally if the SCC board is absent for a long time. Before you replace an SCC board, make sure that there is no rerouting or any other manual operation on ASON services. Do not reset the SCC board when there are ASON services being created, deleted, or rerouted.

NOTICE:

Do not reset the SCC board when there are ASON services being created, deleted, or rerouted.

Precautions for Replacing the FIU Board

Before replacing the FIU board through which ASON services pass, you need to transfer all the services on the board to other trails. Make sure that the services are not interrupted for a long time and that all services on the board are rerouted at the same time.

Precautions for Configuring Node ID

Node ID is used to identify an ASON NE and is unique in a network. You must specify the requirement for configuring the node ID during network planning. When there are services, you cannot modify the node ID.

NOTICE:

The format of the node ID must be the same as the format of the IP address. The node ID cannot be 0.0.0.0, 1.2.3.4 or 255.255.255.255. The node ID cannot be in the same network segment as the IP address of the NE.

Precautions for Enabling or Disabling the ASON Feature

An NE with the ASON software requires enabling the ASON feature. After the ASON feature is enabled, it cannot be disabled if an ASON service is running on the node. If there are no ASON services, you can use the U2000 Web LCT to disable the ASON feature. The disabling operation, however, causes automatic soft reset of the SCC board of the current node.

NOTICE:

Disabling the ASON feature on an NE with ASON services interrupt the ASON services. Hence, downgrade or delete the ASON services on the NE before disabling the ASON feature on an NE. Do not disable the ASON feature when the ASON software is running.

Precautions for Configuring the Interface

By default, the ASON software does not enable the OSPF protocol at the Ethernet network port of the SCC board. A PPP interface is created at each optical port on the line board that is physically installed on the equipment. By default, the OSPF protocol is enabled at each PPP interface. Do not enable the OSPF protocol at the Ethernet network port of the SCC board.

Precautions for Maintaining the U2000 Web LCT System

Do not exit the U2000 Web LCT when it is normally running, though this operation does not interrupt the network services. When the U2000 Web LCT is shut down, however, it cannot monitor the ASON software and the continuity for monitoring the ASON software is affected.

You also need to make sure that the U2000 Web LCT computer is secure and not damaged.