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Appendix A - Screen Reference
© Polycom, Inc. 2003 281
❑ Tx (transmitting) and Rx (receiving) Clock Rates and Errors.
❑ Sync—The - or + sign shows that the system is synchronized
with another T.120 device, such as a Polycom ShowStation.
❑ Video Protocol—ITU video algorithm and annexes being used.
❑ Video Format—CIF, Wide screen, etc.
❑ Audio Protocol—G.711, G.722, or G.728.
❑ Comm Protocol—ISDN (H.320) or IP (H.323).
Advanced Network Statistics
The Advanced Network Statistics screen displays detailed
information about the status of your call. Transmit and receive
speeds are displayed for both audio and video during a call.
To access the Advanced Network Statistics screen:
Select System Info > Diagnostics > Advanced Stats.
This screen displays information about:
❑ Audio Rate—Amount of bandwidth dedicated to audio
(regulated by the audio algorithm in use).
❑ Video Rate—Total bandwidth of call minus audio bandwidth.
❑ Video Rate Used—Actual bandwidth being used for video at
that moment. It will fluctuate and even peak above the Video
Rate number.
❑ Video Frame Rate—Usually near 15, 30, or 60 fps. It will
fluctuate based upon lighting and movement of camera or
people.
❑ Video FEC Errors—Number of received video FEC frames
containing at least one error since the beginning of the call. FEC
(Forward Error Correction) is used to detect and correct errors.