Polycom V500 Administrator's Manual page 114

Administrator's Guide for the V500 System
Symptom
Picture freezes frequently
during an ISDN call.
Picture is slow or jerky.
No picture in the PIP
window.
7 - 14
Problem
Too many network line
transmission errors. Check
the error count on the
Diagnostics > Call
Statistics screen to verify
this.
Network interface cable or
cables may be bad.
The system is receiving
video that includes a large
amount of motion.
Too many network line
transmission errors. Check
the error count on the
Diagnostics > Call
Statistics screen to verify
this.
Only one 64 Kbps channel
is connecting in your call.
The privacy shutter is
closed.
Corrective action
Try the call again.
Replace the cable or cables.
A background with less motion provides a better,
smoother video picture.
Try the call again, possibly at a lower network speed.
Check the ISDN number of the far site. Ask the far
site to call your site.
Open the privacy shutter.