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Knowledge Base

Mobile Communication Vehicle HD Terminal join conference failure and with monochrome image

Publication Date:  2012-12-17  |   Views:  683  |   Downloads:  0  |   Author:  j00222223  |   Document ID:  EKB1000021765


Issue Description

1.An HD VC terminal 9035 on mobile communication vehicle uses E1 line to communicate, with two ways of video input, one is standard defination and the other is high defination. The standard input is black and white after turn on the terminal.
2.After insert the new E1 interface card and connect the office communication line, the terminal unable to join conference and make point to point calling either.

Alarm Information


Handling Process

1.CVBS transmit composite video signal, which combines luminance signal and chrominance signal. S-Video transmit the two signal in a saperate way, so the monochrome image perhaps is caused by transmission way selection. Check the corresponding interface of output signal and use remote control to change video output form and then the problem solved.
2.Make internal loopback under E1 transmission line and check line condition to be normal, so the terminal E1 interface card is normal.
3.Use a testing terminal which has been tested and proved normal before to check whether it is the transmission line problem. The testing terminal still couldn't join the confernce and thus draw a conclusion that there must be some problem in the office transmission line.
4.The office staff fix the E1 line and the testing terminal join conference successfully.
5.Change connection line to connect the abnormal terminal, successfully join conference and all function normal.

Root Cause and white image under local standard input perhaps caused by signal mode selection problem.
2.E1 interface card broken.
3.E1 transmission line problem or transceiver corresponding failure. transmission line or internet problem


When solving problems in the office, we need to ensure whether it is our product problem. If we estimate the office transmission line problem, we must prove to our customer that our product itself is normal. Thus can urge the office staff to check their line problem.