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Knowledge Base

Reconsideration of the problem of power source outlet causing E1 terminal error code

Publication Date:  2012-09-25  |   Views:  273  |   Downloads:  0  |   Author:  q00229199  |   Document ID:  EKB1000016141


Issue Description

Yunnan Railcom and Telecom using our company’s R480 HD video terminal VP8036 to connect with MCU of Beijing headquarters by 2M special line.
After join the meeting, there is lots of error code, and error emerge very irregular, can’t have meeting normally, and terminals often halt and restart.

Alarm Information

Terminal state information prompts that CRC error rate is about 20%,and very unstable. The video receiving frame rate keeps changing between 16-23.

Handling Process

1. Check the corresponding configuration (clock, CRC validate, signaling transmission mode CCS ), everything is normal.
2. Plug live wire and zero line to the outlet, error still exist. Use triple cable plug again.
3. Grounding the terminal’s land port and transmitting equipment, error still exist, but becomes better. It seems the grounding is necessary. Can partially solve the problem. 
4. Check the MCU port: loop the terminals 2m cable with BNC head. Let Beijing headquarters check MCU port, the state is normal on LM. It means the MCU port is normal.
5. Loop terminal’s DDF, terminal can call itself normally, there is still error code after entering the conference. The terminal hardware may have problem or software version problem. Upgrade terminal with LOAD, the self loop the port board with company’s crystal head, then call, find out there is error code with the moving camera now and then, we doubt the terminal has problem.
6. Let Beijing test Kunming –Beijing machine room’s error code. Beijing find out that 2m line is normal without error code. Locate the problem on power source and software’s problem.
7. Because client uses illumines electricity, let client connect the terminal with other power source. Client can’t supply. Keep on testing; all the people in the building go home at night, the terminal is normal after join the conference. So the problem should be on power source.
8. In the test next morning, emerge serious problem of black screen and mosaic. We doubt the software may have problem too.
9. Terminal halts 5 times, restarts 1 time in a single morning.
10. Grounding the fire wire and zero wire, problem is solved.

Root Cause

1. Terminal software setting problem, terminal software version problem.
2. Transmitting line has error code, and terminal grounding problem
3. MCU terminal port malfunction
4. Power source supply issue.


1. The illumines electricity may interrupt 2M module, our 2M module needs to improve
2. Terminal’s  antijam ability needs to improve.