Nortel Networks NN44470-100 manual QoS properties Property Description

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MAS commissioning

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	The QoS maximum bandwidth for H.263 video flow
H.263 Video Flow (Bytes)	in bytes. The default is 300 kbytes.
QOS Maximum Bandwidth Per	The QoS maximum bandwidth for NNVC video
NNVC Video Flow (Bytes)	flow in bytes. The default is 300 kbytes.
QOS Monitoring	Enable or disable QoS monitoring and reporting.
QOS Monitoring Critical R	The R-Factor threshold, which generates a critical
Threshold (%)	alert when the threshold is crossed. The default
	value is 70%.
QOS Monitoring Warning R	The R-Factor threshold, which generates a
Threshold (%)	warning alert when the threshold is crossed. The
	default is 80%.
QOS Monitoring Maximum	The maximum number of alerts that can be
Alerts	generated during a particular interval (QoS
	Monitoring Alert Interval). This property reduces
	network traffic. The default value is 100.
QOS Monitoring Alert Interval	The minimum time between QoS alert monitoring
(sec)	(the alert refresh interval). The default value is 60
	seconds.
QOS Monitoring Refresh	The minimum time between QoS statistic
Interval (sec)	reporting. The default is 15 seconds. Nortel
	recommends that you do not modify this property.

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