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Knowledge Base

The System Prompts “Invalid CAR Parameter DCBS and Error Code 39720” In the CAR Configuration of the N1EGS2 Board

Publication Date:  2012-07-25  |   Views:  170  |   Downloads:  0  |   Author:  z30197  |   Document ID:  EKB0000358074


Issue Description

In the configuration of the CAR parameters of the N1EGS2 board in the T2000, an error is always reported if the committed burst size is not set to 0. The detailed prompt information is “Invalid CAR parameter DCBS and error code 39720”. However, the T2000 prompts that the allowed committed burst size ranges from 0 to 32. 

Alarm Information


Handling Process

1. The error code is less than 65535. The alarm indicates that the error occurs in the equipment check when the command is delivered to the equipment. This problem is not caused by the T2000.
2. The engineers query the meaning of the parameter DCBS and find that it represents the ΔCommitted Burst Size.
3. The engineers change the DCBS value from the original 32 to the default 0. Then, the command is delivered successfully. 

Root Cause

The engineers refer to related data and find that:
The committed burst sizes of boards N1EMS4, N1EGS4, and N3EGS4 range from 0 to 32;
The committed burst size of the board N1EAS2 cannot be configured.
The committed burst sizes of boards N2EFS0, N1EFS4, and N1EGS2 are set to 0 by default and cannot be configured.
The committed burst sizes of boards N4EFS0, N2EFS4, N2EGS2, N2EMR0, and N2EGR2 range from 0 to 128.