Huawei 9000 VCT V100R011 Administrator's Manual page 176

HUAWEI 9000 HD Video Terminal
Administrator Guide
Problem
The local video is not
displayed properly.
For example, the
video is in black and
white or blinks in
black and white.
After the local site
joins a conference,
the video of a remote
site is not clear. For
example, there is
mosaic, frozen
image, or
discontinuity in the
video output.
Issue 09 (2012-09-03)
Possible Cause
If the remote video is displayed
as a blue screen, the remote site
hides its video by sending a
blue screen.
The current video output
interface is set to display the
local video.
The output mode of the video
output interface is set
incorrectly.
After you perform a local video
loopback test, the video quality
is poor, which indicates that
faults exist on the local video
module.
When the scene captured by a
remote camera is changed, the
remote video is not clear
because the remote camera is
not set to focus automatically.
In this case, the remote camera
is set to focus on a near or far
scene.
When the conference rate is
lower than 256 kbit/s, the audio
protocol is set incorrectly. For
example, access the Call
Statistics screen. If the
conference rate is 256 kbit/s
and if the audio bandwidth is 64
kbit/s, the video bandwidth will
be only 196 kbit/s. Therefore,
the video quality is poor.
Low video bandwidth is
available for the local site
because the network is busy.
Certain data is lost during
transmission, because the
quality of a network connection
device (such as an optical fiber
transceiver) is poor.
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11 Maintenance and Troubleshooting
Solution
Contact the administrator of the
remote site to solve this problem.
Set the current video output
interface to display the remote
video.
l Ensure that the mode of the
video output interface and the
cable that is used match each
other.
l Check whether the cable is
connected correctly or replace
the cable if necessary.
Send the terminal to the relevant
distributor for maintenance.
Set the main camera of the remote
site to focus automatically.
If the conference rate is lower than
256 kbit/s, it is recommended that
you set the audio protocol to G.728
to reduce the bandwidth used for
audio transmission.
Try to avoid initiating a conference
when the network is likely to be
busy.
Replace the relevant network
connection device (such as the
optical fiber transceiver).
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