Lost Packet Recovery And Dynamic Bandwidth Settings - Polycom RealPresence Group Series Administrator's Manual

Setting
Enable RSVP
Dynamic Bandwidth
MRC Bandwidth Allocation
Maximum Transmit Bandwidth
Maximum Receive Bandwidth
Note: When a RealPresence Group 500 or RealPresence Group 700 system is hosting a multipoint call, the total
call rate for all sites in the call is 6 Mbps.
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Lost Packet Recovery and Dynamic Bandwidth Settings

Lost Packet Recovery and Dynamic Bandwidth Settings
You can handle video quality issues on your RealPresence Group Series system by enabling the Enable
Lost Packet Recovery (LPR) setting, the Dynamic Bandwidth setting, or both settings.
If both settings are enabled, Dynamic Bandwidth adjusts the video rate to reduce packet loss to 3% or
less. When packet loss drops to 3% or less, LPR cleans up the video image on your monitor. The
additional processing power required might cause the video rate to drop while the system is using LPR. If
this happens, the Call Statistics screen shows the Video Rate Used as lower than the Video Rate. If
Packet Loss is 0 for at least 10 minutes, LPR stops operating and the Video Rate Used increases to
match the Video Rate.
If only LPR is enabled and the system detects packet loss, LPR attempts to clean the image but the video
rate is not adjusted. If only Dynamic Bandwidth is enabled and the system detects packet loss of 3% or
more, the video rate is adjusted but LPR does not clean the image.
You can view percent Packet Loss, Video Rate, and Video Rate Used on the Call Statistics screen.
Related Links
Configure Network Quality Settings
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General Troubleshooting
Polycom, Inc.
on page 77
on page 272
Description
If you enable this setting, the system can use the
Resource Reservation Setup Protocol (RSVP) to
request that routers reserve bandwidth along an IP
connection path. (To use this feature, the near and far
site must support RSVP.)
Enable this setting if you want the system to
automatically determine the optimal call rate.
Adjusts media bit stream bandwidth, reducing packet
loss. This setting is specifically designed for SVC-
based calls.
Specifies the maximum transmit call rate between 64
kbps and the system's maximum line rate.
Use this setting when the system connects to the
network using an access method with different transmit
and receive bandwidths.
Specifies the maximum receive call rate between 64
kbps and the system's maximum line rate.
Use this setting when the system connects to the
network using an access method with different transmit
and receive bandwidths.
on page 79
Configuring Network Settings
79