Nortel Networks NN44470-100 - Manual (Page 23)

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MAS commissioning
Nortel Media Application Server 6.0 for AS 5300
Fundamentals
NN44470-100 01.01 Standard
Release 6.0 03 June 2008
Copyright © 2008, Nortel Networks
MAS uses flow specifications for each codec to identify packet delivery
characteristics to the operating system, enabling it to prioritize (internally)
packets destined to and from the network interface card (NIC). The framework
ensures that QoS marked packets sent from MAS media processors are not
dropped or delayed in their delivery to the wire. MAS can reserve a
percentage of NIC bandwidth for its media processors. This ensures that
management and signaling does not affect the quality of the audio or video
streams in use on the platform. Use of flow specifications also offers some
denial of service protection as the transport layers discard packets (instead of
attempting to process them) that do not conform to the flow specification.
MAS contains the Telchemy VQMON agent for QoS monitoring and RTCP-XR
support. R-Factor, jitter, and packet loss are continually monitored for each
call. Calls that fall below a configured R-Factor threshold are logged. All QoS
statistics are archived with session detail records for analysis.
To configure QoS, use the Nortel MAS Console. You can configure the
following QoS properties.
QoS properties
Property Description
QOS Maximum Bandwidth Per
H.263 Video Flow (Bytes) The QoS maximum bandwidth for H.263 video flow
in bytes. The default is 300 kbytes.
QOS Maximum Bandwidth Per
NNVC Video Flow (Bytes) The QoS maximum bandwidth for NNVC video
flow in bytes. The default is 300 kbytes.
QOS Monitoring Enable or disable QoS monitoring and reporting.
QOS Monitoring Critical R
Threshold (%) The R-Factor threshold, which generates a critical
alert when the threshold is crossed. The default
value is 70%.
QOS Monitoring Warning R
Threshold (%) The R-Factor threshold, which generates a
warning alert when the threshold is crossed. The
default is 80%.
QOS Monitoring Maximum
Alerts The maximum number of alerts that can be
generated during a particular interval (QoS
Monitoring Alert Interval). This property reduces
network traffic. The default value is 100.
QOS Monitoring Alert Interval
(sec) The minimum time between QoS alert monitoring
(the alert refresh interval). The default value is 60
seconds.
QOS Monitoring Refresh
Interval (sec) The minimum time between QoS statistic
reporting. The default is 15 seconds. Nortel
recommends that you do not modify this property.