Polycom RealPresence 1800 Administration Manual page 373
Collaboration server
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Also See for RealPresence 1800:
- Administrator's manual (1113 pages) ,
- Getting started manual (70 pages) ,
- Hardware manual (18 pages)
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System Flags
Traffic shaping usage is controlled by Collaboration Server configuration system flags (for the entire bridge):
● ENABLE_RTP_TRAFFIC_SHAPING - Enables traffic shaping. When set to YES, traffic shaping is
applied to all ports, resulting in some port capacity reduction (see
NO, traffic shaping is disabled.
● VIDEO_BIT_RATE_REDUCTION_PERCENT - Indicates the percentage of actual reduction in bit
rate sent from the MCU to the endpoint (negotiated bit rate is not reduced). This flag is applicable only
when traffic shaping is enabled (ENABLE_RTP_TRAFFIC_SHAPING set to YES).
Range: 0-60; Default value: 15
● TRAFFIC_SHAPING_MTU_FACTOR - Used for the MTU (Maximum transmitting Unit - the size of
transmitted packets) dynamic calculation:
New MTU = video bit rate / TRAFFIC_SHAPING_MTU_FACTOR
where the new MTU value is guaranteed to be a minimum of 410, and a maximum of 1460
(MAX_MTU). The purpose of this calculation is to match video rate in outgoing video to call rate, yet
force lower encoder bit rates to avoid overflow.
This flag is applicable only when traffic shaping is enabled.
Range: 0-5000, where 0 signifies no change in MTU; Default value: 800
To modify any of these flags, manually add them into the MCMS user parameters section of the system
configuration flags, and then modify their value (see
Capacity Reduction During Traffic Shaping
The table below describes the maximum capacity left after reduction due to traffic shaping in Collaboration
Servers 2000/4000. There is no capacity reduction in Collaboration Servers 1800 and Virtual Edition.
Capacity Reduction
Resolution
CIF
SD
HD720p
HD1080p
Audio Only
* Assuming conference bit rate ≤ 1024 Kbps
System Limitation
Currently, Traffic shaping is limited to conferences using a minimum of 384 bit rate. Under this bit rate, the
user might experience bursts of data.
Polycom, Inc.
Non-mixed Mode
150 *
150 *
100
50
300
Capacity
Manually Adding a System Flag
Mixed Mode
100 *
100 *
66
40
150
Appendix - Media Traffic Shaping
Reduction). When set to
).
352
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