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Biamp Systems

DiffServ to ToS conversion table

This article describes how to convert Quality of Service (QoS) parameters to the ToS (Type of Services) format that is used by Biamp's VoIP-2 card.  The table below shows DiffServ PHB and DiffServ DSCP codes, and converts them to the corresponding individual ToS parameters.

The DiffServ codes only code for certain Types of Services parameters: the Precedence, Min Delay, Max Throughput, and Max Reliability parameters for Layer 3 traffic only.  The VoIP-2 card also allows the setting of Layer 2 User Priority and Layer 3 Min Cost parameters, which are not shown in the table below.

Conversion table

DiffServ PHB DiffServ DSCP   L3 Precedence L3 Min Delay L3 Max Throughput L3 Max Reliability

Default

0   0 Off Off Off
CS1 8   1 Off Off Off
AF11 10   1 Off ON Off
AF12 12   1 ON Off Off
AF13 14   1 ON ON Off
CS2 16   2 Off Off Off
AF21 18   2 Off ON Off
AF22 20   2 ON Off Off
AF23 22   2 ON ON Off
CS3 24   3 Off Off Off
AF31 26   3 Off ON Off
AF32 28   3 ON Off Off
AF33 30   3 ON ON Off
CS4 32   4 Off Off Off
AF41 34   4 Off ON Off
AF42 36   4 ON Off Off
AF43 38   4 ON ON Off
CS5 40   5 Off Off Off
EF 46   5 ON ON Off
CS6 48   6 Off Off Off
CS7 56   7 Off Off Off
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