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TANDBERG MPS User Manual
8. Features
In this section we will describe TANDBERG MPS features that are not covered in the previous sections of the User
Manual.
8..1 Quality of Service features (QoS)
All QoS features must be enabled in your IP network in addition to correct MPS configuration.
8..1.1 IP precedence
IP precedence is a classification of packets from 0 (low priority) to 7 (high priority). The
values 6 and 7 are typically reserved for congestion control. IP precedence helps a router
select what kind of traffic to prioritize. By means of queue mechanisms, it can select
which packets to send first and which to throw away. Some information/traffic is time
critical while other is not, and classification is used to differentiate this traffic.
One may set separate IP precedence for Signaling, Audio, Video and Data (values 1 – 7)
as well as turn IP precedence off.
The �u�� setting uses the following values for IP precedence:
Signaling=4
Audio/Video=4
Data=4 (e.g. FECC commands)
Note that separate priorities for Audio and Video are not recommended as this may cause reduced quality and lipsync
problems.
8..1. Differential services (DiffServ)
Differential Services is another method of QoS offered by TANDBERG that utilizes 6 bits
of the Type of Services Byte. Differential Services is an extension of IP precedence, where one can set values from
0 to 63 (63=Highest priority). This method is currently replacing IP Precedence as the preferred method for setting
priority of packet traffic.
8..1. IP type of service (TOS)
TOS helps a router select a routing path when multiple paths are available.
De��� - tells router to minimize delay
T�r�ug�pu� - tells router to maximize throughput
Re�i��i�i�� - tells router to maximize reliability
���� - tells router to minimized cost
Off - Turns TOS off
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D13373.04
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