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Knowledge Base

Board Loopback Releasing in the Case of a Board Warm Reset

Publication Date:  2012-07-25  |   Views:  173  |   Downloads:  0  |   Author:  SU1001434059  |   Document ID:  EKB0000358092


Issue Description

When a board starts up after a warm reset, the loopback cannot be released automatically. 

Alarm Information


Handling Process

To release the loopback, issue the loopback-releasing command again.
To set the non-loopback on the T2000, do as follows:
Step1 In the NE Explorer, select the board to be configured. In the Function Tree, choose Configuration > WDM Interface.
Step2 Select By Board/Port (Channel).Select Channel or Board in the drop-down menu. Then click Query. The parameter list of each optical interface/channel is displayed.
Note: When selecting By Function, you can query and set parameters for the boards and channels by function. 

Root Cause

The board has the function of automatically releasing loopback. The time for automatically releasing board loopback can be set by running a command.
On the T2000, do as follows:
Step1 Choose Configuration > Automatic Disabling of NE Function.
Step2 Select and click a proper NE.
Step3 Set Auto Disabling and Auto Disabling Time (min);
Step4 Click Apply.
You can set the minimum time to 1 minute and the maximum time to 2880 minutes.
Normally, when the loopback auto-releasing time expires, the NE software issues a command to release the loopback. The board loopback is released.
Note: When the loopback auto-releasing time expires, the NE software issues a command to release the loopback. Now, the board is in the warm reset process. The loopback releasing command cannot be run. When the board starts up after reset, the loopback is not released. In this case, the loopback logic state differs from the physical state. You must check whether the loopalm alarm exists on the T2000.