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Knowledge Base

Solving ISDN slip code by software upgrade

Publication Date:  2012-09-20  |   Views:  203  |   Downloads:  0  |   Author:  q00229199  |   Document ID:  EKB1000015453


Issue Description

The image turn to blue screen after certain terminal use ISDN join the conference.

Alarm Information

Terminal hardware state: None; Panel code light: Flashing; VP8620port error code:85%

Handling Process

Use point to point call, problem still exists. Eliminate the malfunction of MCU port by self-loop. Base on the malfunction phenomenon, judge that the reason may be on the switch clock or different terminal and MCU PRI line clock doesn’t synchronize, causing slip code. By consulting network manager center, this PRI is from some kind of CM module of switch. Clock precision is class 3. Let the bureau to solve the clock issue is not realistic. Consider adjusting clock time delay can be done on terminal. So, upgrade terminal software from 2.7 to 2.9. Problem solved. At the same time, when line clock slipping code, we can see the system adjust in MCU information window. 

Root Cause

Shortly after join the meeting, the image emerge blue screen, image solidify. Point to point call has the same problem. The error rate is so high, that cannot be line error code, the problem may be on the clock.