Network Traffic Control - Polycom RealPresence 4000 Administrator's Manual

Network Traffic Control

The Network Traffic Control mechanism controls the level of UDP packets generated by the
system. It regulates a set of queuing systems and mechanisms by which UDP packets are
received and "transmitted" to the network router.
During a conference the MPMx cards occasionally blast-out UDP packets which can cause
overloads on the network. RMX bandwidth usage can increase to above the designated
conference participant line rate settings, causing network bandwidth issues such as latency
and packet loss.
Only supported in the MPMx Card Configuration mode.
Three Network Traffic Control Flags are used to control the Network Traffic mechanism:
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SIP Proxy Failover With Polycom® Distributed Media
Application™ (DMA™) 7000
RMX systems that are part of a RealPresence DMA system environment can benefit from the
RealPresence DMA system's SIP Proxy Failover functionality.
SIP Proxy Failover is supported in the RealPresence DMA system's Local Clustering mode
with redundancy achieved by configuring two DMA servers to share a single virtual IP
address.
The virtual IP address is used by the RMX as the IP address of its SIP Proxy.
No additional configuration is needed on the RMX.
Should a SIP Proxy failure occur in one of the RealPresence DMA system servers:
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Polycom, Inc.
ENABLE_TC_PACKAGE
When the flag is set to NO (default), Network Traffic Control is disabled on the RMX.
Set the flag to YES to enable Network Traffic Control.
TC_BURST_SIZE
This flag regulates the Traffic Control buffer or maxburst size as a percentage of the
participant line rate. In general, higher traffic rates require a larger buffer. For example,
if the flag is set to 10 and the participants line rate is 2MB, then the burst size is
200Kbps.
Default = 10
Flag range: 1-30.
TC_LATENCY_SIZE
This flag limits the latency (in milliseconds) or the number of bytes that can be present
in a queue.
Default = 500
Flag range: 1-1000 (in milliseconds).
The other RealPresence DMA system server takes over as SIP Proxy.
Ongoing calls may be disconnected.
Previously ongoing calls will have to be re-connected using the original IP address,
registration and connection parameters.
Chapter 16-Network Services
16-41