Huawei TE40 Administrator's Manual page 141

HUAWEI TE40&TE50&TE60 Videoconferencing
Endpoint
Administrator Guide
Problem
black and white.
While the endpoint
is in use during a
conference, the
video of a remote
site is not clear. For
example, there are
artifacts, frozen
images, or
discontinuity in the
video output.
While the endpoint
is in use during a
conference, the
video of a remote
site can be
displayed
continuously but the
video quality is not
satisfactory.
Issue 01 (2013-09-30)
Possible Cause
incorrectly.
Faults occur in the local video
module.
The remote camera is set to
focus on a close or distant
scene. When the remote
camera is not set to automatic
focus and the scene captured
by a remote camera changes,
the captured video becomes
unclear.
Incorrect audio protocols are
specified for conferences
whose data transmission rates
are lower than or equal to 256
kbit/s. To view the data
transmission rate of a
conference, access the Status
screen. For example, if the
conference rate is 256 kbit/s
and the audio bandwidth is 64
kbit/s, the video bandwidth is
only 196 kbit/s. In this case,
the video quality is poor.
Only low video bandwidth is
available for your site because
the network is busy.
The quality of a network
connection device, such as an
optical fiber transceiver, is
poor. As a result, certain data
is lost during transmission.
Ask the remote site
administrator to perform a
local video loopback test. If
the video quality is good, the
video frame rate set at the
remote site is too high.
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12 Troubleshooting
Solution
other.
 Verify that the cable is
connected correctly. Replace
the cable if necessary.
Perform a local video loopback
test. If the video quality is poor,
faults occur in the local video
module. In this case, send the
endpoint to the local distributor for
maintenance.
Set the remote camera to
automatic focus.
If the conference rate is lower than
256 kbit/s, set the audio protocol
to G.728 to reduce the bandwidth
used for audio transmission.
Do not initiate conferences during
network busy hours.
Replace the related network
connection device.
Ask the administrator of the
remote site to disconnect from the
conference, set the video frame
rate to a smaller value, and join
the conference again.
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