Lost Packet Recovery And Dynamic Bandwidth - Polycom realpresence group series Administrator's Manual

Setting
Control
OA&M
Maximum Transmission
Unit Size
Maximum Transmission
Unit Size Bytes
Enable Lost Packet
Recovery
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.

Lost Packet Recovery and Dynamic Bandwidth

You can handle video quality issues by selecting 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
Polycom, Inc.
Description
Specifies the IP Precedence or Diffserv value for control traffic on any of the
following channels:
• H.323—H.225.0 Call Signaling, H.225.0 RAS, H.245, Far End Camera Control
(FECC, which, for RealPresence Group systems, is the Allow Other Participants
in a Call to Control Your Camera setting under Admin Settings > Audio/Video
> Video Inputs > General Camera Settings)
• SIP—SIP Signaling, FECC, Binary Floor Control Protocol (BFCP)
Specifies the IP Precedence or Diffserv value for traffic not related to video, audio, or
FECC.
Specifies whether to use the default Maximum Transmission Unit (MTU) size for IP
calls or select a maximize size.
Specifies the MTU size, in bytes, used in IP calls. If the video becomes blocky or
network errors occur, packets might be too large; decrease the MTU. If the network
is burdened with unnecessary overhead, packets might be too small; increase the
MTU.
Allows the system to use LPR (Lost Packet Recovery) if packet loss occurs.
Allows the system to use Resource Reservation Setup Protocol (RSVP) to request
that routers reserve bandwidth along an IP connection path. Both the near site and
far site must support RSVP in order for reservation requests to be made to routers
on the connection path.
Specifies whether to let the system automatically find the optimum call rate for a call.
Adjusts media bit stream bandwidth, reducing packet loss. Specifically designed for
SVC-based calls. For more information on SVC, see
Specifies the maximum transmit call rate between 64 kbps and the system's
maximum line rate. This setting can be useful when the system is connected to the
network using an access technology that provides different transmit and receive
bandwidth (such as cable or DSL access).
Specifies the maximum receive call rate between 64 kbps and the system's
maximum line rate. This setting can be useful when the system is connected to the
network using an access technology that provides different transmit and receive
bandwidth (such as cable or DSL access).
Networks
Set SVC Call Preferences.
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