Technical Description of TANDBERG Gateway with software version G2
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 Signalling, Audio, Video and Data (values 1 – 7) as well as turn IP precedence off.
The auto setting uses the following values for IP precedence:
Signalling=6
Audio/Video=4
Data=3 (e.g. FECC commands)
This means that in auto, IP precedence has the value 6 (i.e. signalling value) while both audio and video value is 4; data value is 3. Setting the IP precedence value in system’s menu is actually setting the signalling value. The audio/video and data values are changed accordingly in respect to the signalling value (i.e. audio/video value = - 2; data value = - 3).
4.1.5.1.2Diffserv
Diffserv is an extension of IP precedence, where values from 0 to 63 (63=Highest priority) can be set.
4.1.5.1.3IP type of service (TOS)
TOS helps a router select a routing path when multiple paths are available. Delay- tells router to minimize delay
Throughput- tells router to maximize throughput Reliability- tells router to maximize reliability Cost- tells router to minimized cost
Off- Turns TOS off
4.1.5.1.4
RSVP is a protocol that allows the TANDBERG Gateway to request the network to reserve the bandwidth needed for the IP meeting.
4.1.5.2IP adaptive bandwidth management
•The TANDBERG Gateway never produces more traffic than needed for better utilization of network resources. Most of the data sent in a videoconference is video data. Thus, by incorporating smart video algorithms, the codec sends no more video data than necessary. Little movement in the picture gives low bit rate; while a lot of movement gives higher bit rate.
•The TANDBERG Gateway regulates outgoing and incoming media bit rates by means of flow control signalling.
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