MicroNet Technology SP1659P - Manual (Page 60)

Queue 3.
3.19.4 D/T/R/M - Type ToS
IP TOS Priority affect TOS fields of IP header, you can find it has 8-bit SERVICE TYPE field that specifies how
the datagram should be handled. The field could be divided into six subfields as follows, PRECEDENCE (3
bits), D-Type (Delay Priority, 1 bit), T-Type (Throughput Priority, 1bit), R-Type (Reliability Priority, 1bit), M-Type
(Monetary Cost Priority, 1bit), and UNUSED. PRECEDENCE 3-bits can arrange 8 kinds of priorities
corresponding to the 0~7 priority in the following priority diagram.
TOS Delay Priority Mapping works while D-TYPE in TOS field of IP header of the packets received by the
switch is configured.
TOS Throughput Priority Mapping works while T-TYPE in TOS field of IP header of the packets received by the
switch is configured.
TOS Reliability Priority Mapping works while R-TYPE in TOS field of IP header of the packets received by the
switch is configured.
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