TANDBERG D13192 User Manual
Technical Description of
TANDBERG Gateway
with software version G2
D13192 Rev. 02
11
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:
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)
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).
4.1.5.1.2 Diffserv
Diffserv is an extension of IP precedence, where values from 0 to 63 (63=Highest
priority) can be set.
priority) can be set.
4.1.5.1.3 IP 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 Resource-Reservation Protocol (RSVP)
RSVP is a protocol that allows the TANDBERG Gateway to request the network to
reserve the bandwidth needed for the IP meeting.
reserve the bandwidth needed for the IP meeting.
4.1.5.2 IP 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.
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.