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Diagnostics and General Troubleshooting
7 - 19
Edges of picture are cut off
when viewing graphics.
Graphics from the far site
are displayed on an NTSC
monitor.
Use a VGA monitor to display graphics.
The laptop’s display
resolution or refresh rate
does not match the settings
for the Visual Concert VSX.
Be sure the laptop’s refresh rate is set to 60 Hz, and
that the laptop and the Visual Concert VSX use the
same display resolution.
Call participants cannot see
or hear what is being
played on the VCR or DVD.
The VCR or DVD is not
selected.
Select the VCR (Camera 3):
Press
Camera, then press 3.
The VCR or DVD is not set
up correctly.
Check that the VCR or DVD is connected according
to the instructions in the section Connecting
VCR/DVDs on page 2-28.
Refer to the manufacturer’s instructions to set up the
VCR or DVD correctly.
Picture freezes frequently
or becomes blocky during
an IP call.
There is too much traffic on
the LAN. Check the error
count on the Call Statistics
screen.
Go to Admin Settings > Network > IP > Quality of
Service and enable dynamic bandwidth.
The network is
experiencing packet loss.
Go to Admin Settings > Network > IP > Quality of
Service and specify a smaller value for Maximum
Transmission Unit Size.
Picture freezes frequently
during an ISDN call.
Too many network line
transmission errors. Check
the error count on the
Diagnostics > Call
Statistics screen to verify
this.
Try the call again.
Network interface cable or
cables may be bad.
Replace the cable or cables.
Picture is slow or jerky. The system is receiving
video that includes a large
amount of motion.
A background with less motion provides a better,
smoother video picture.
Too many network line
transmission errors. Check
the error count on the
Diagnostics > Call
Statistics screen to verify
this.
Try the call again, possibly at a lower network speed.
Only one 64 Kbps channel
is connecting in your call.
Check the ISDN number of the far site. Ask the far
site to call your site.
Symptom Problem Corrective action