D15329.08 SX20 Administrator Guide CE9.2, NOVEMBER 2017. www.cisco.com — Copyright © 2017 Cisco Systems, Inc. All rights reserved.
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Cisco TelePresence SX20 Quick Set Administrator Guide
Adjust the video quality to call rate ratio
Video input quality settings
When encoding and transmitting video there is a trade-off
between high resolution (sharpness) and high frame rate (motion).
The Video Input Connector n Quality setting must be set to
Motion for the optimal definition settings to take any effect. With
the video input quality set to Sharpness, the endpoint will transmit
the highest resolution possible, regardless of frame rate.
Optimal definition profile
The optimal definition profile should reflect the lighting conditions
in the video conferencing room and the quality of the camera
(video input source). The better the lighting conditions and the
better the quality of the camera, the higher the profile should be
used.
Generally, the Medium profile is recommended. However, if the
lighting conditions are very good, we recommend that you test
the endpoint on the various Optimal Definition Profile settings
before deciding on a profile. The High profile may be set in order
to increase the resolution for a given call rate.
Some typical resolutions used for different optimal definition
profiles, call rates and transmit frame rates are shown in the table.
The resolution and frame rate must be supported by both the
calling and called systems.
Threshold for sending video at 60 fps
Use the Video Input Connector n OptimalDefinition
Threshold60fps setting to decide when to allow sending video at
60 fps.
For all resolutions lower than this threshold, the maximum
transmitted frame rate will be 30 fps; for higher resolutions, 60 fps
is possible if the available bandwidth is adequate.
Sign in to the web interface and navigate to Setup > Configuration.
1. Go to Video > Input > Connector n > Quality and set the video
quality parameter to Motion.
2. Go to Video > Input > Connector n > OptimalDefinition >
Profile and choose the preferred optimal definition profile.
3. Go to Video > Input > Connector n > OptimalDefinition
> Threshold60fps to set the threshold below which the
maximum transmitted frame rate will be 30 fps.
Resolutions and frame rate [w×h@fps] obtained for different optimal definition profiles and call rates
Call rate
[kbps]
H.264, maximum 30 fps H.264, 60 fps allowed at 512×288 and higher resolutions
Normal Medium High Normal Medium High
128 32 0×180 @3 0 512×288@20 512×288@30 32 0×180 @3 0 512×288@20 512×288@30
256 512×288@30 640×360@30 768×448@30 512×288@30 640×360@30 512×288@60
384 640×360@30 768×448@30 768×448@30 640×360@30 512×288@60 640×360@60
576 768×448@30 1024×576@30 1280×72 0 @ 3 0 512×288@60 768×448@60 768×448@60
768 1024×576@30 1280×720 @3 0 1280×720 @3 0 640×360@60 768×448@60 1024×576@60
1152 1280×720 @3 0 1280×720 @3 0 1280×720 @3 0 768×448@60 1024×576@60 1280×720 @ 6 0
1472 128 0×720@30 1280×72 0 @ 30 1920×10 8 0 @ 3 0 1024×576@60 1024×576@60 128 0×720 @60
1536 128 0×720 @3 0 128 0×720 @3 0 1920×108 0@30 1024×576@60 1280×720 @ 6 0 1280×72 0 @ 6 0
2176 128 0×720@30 1920×1080@30 1920×10 8 0 @ 3 0 1280×720 @60 1280×720 @60 1280×720 @60
3232 1920×10 8 0 @ 3 0 192 0×1080@30 1920×108 0 @ 3 0 1280×720 @ 6 0 1920×10 8 0 @60 19 20×10 8 0 @60
4736 1920×10 8 0 @ 3 0 192 0×1080@30 1920×108 0 @ 3 0 1920×10 8 0 @60 19 20×10 8 0 @60 19 20×10 8 0 @60
6000 1920×10 8 0 @ 3 0 192 0×1080@30 1920×108 0 @ 3 0 1920×10 8 0 @60 19 20×10 8 0 @60 19 20×10 8 0 @60
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