SatLink VSAT User Guide
Publication no. 101557
Copyright © 2009 – STM Group, Inc.
Page 67 (160)
11.3 Configuring the VSAT for Video (ViC)
The following QoS alternatives are available for the ViC PHB group:
1. All ViC traffic is mapped to QoS group 3.
2. ViC video is mapped to QoS group 3 and ViC audio+signalling is mapped to QoS group 4
3. ViC video is mapped to QoS group 3, ViC audio is mapped to QoS group 4 and ViC signalling is
mapped to QoS group 5
The second alternative has the advantage that the audio and the audio-signalling are protected from
fluctuations in video traffic. The third alternative has the additional advantage of giving extra protection
to the ViC signalling. However, to use option two and three, the VSAT’s QoS classification must be able
to distinguish between the video, audio, and signalling components of the Vic in order to separate them
into different QoS groups.
11.4 DSCP and DiffServ
The following DSCP values are recommended to use on equipment connected to the STM SatLink
VSAT:
Traffic Recommended DSCP Recommended QoS group
Best Effort 0 (000000) 0
Critical Data 26 (AF31; 011010) 6
ViC bulk 46 (EF; 101110) if VoIP is not in
use
47 (101111) otherwise
3
ViC video 46 (EF; 101110) if VoIP is not in
use
47 (101111) otherwise
3
ViC audio+ signalling 39 (100111) 4
ViC audio 39 (100111) 4
ViC signalling 35 (100011) 5
VoIP bulk 46 (EF; 101110) 1
VoIP audio 46 (EF; 101110) 1
VoIP signalling 43 (101011) 2
Unconditional packet dropping 3 (000011) n.a.
Recommended mapping to support standardized DiffServ compliance:
DSCP Recommended QoS group Comment
0 (000000) 0 Best effort
56 (111000) 6 Requires forwarding precedence
48 (110000) 6 Requires forwarding precedence
Other, not specifically treated 0 Best effort
Recommended mapping for support of the standardized AF PHB group, using AF class 3 as example:
DSCP Recommended QoS group Comment
26 (AF31; 011010) 6 AF Class 3 low drop precedence
28 (AF32, 011100) 0 AF Class 3 medium drop
precedence
30 (AF33, 011110) 0 AF Class 3 high drop precedence
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