NEC SL1100 Networking Manual page 167

NEC SL1100
IP
Precedence Precedence
1(on) here = 1(on) here =
value of 4 value of 2
Networking Manual
Working in conjunction with IP precedence, the next 4 bits in the ToS field are
designed to influence the delivery of data based on delay, throughput,
reliability, and cost. However these fields are typically not used.
The following table shows the 8-bit ToS field and the associated IP
precedence bits.
IP IP
Precedence
1(on) here =
value of 1
Differential Services Code Point (DSCP)
DSCP stands for Differential Services Code Point (or Diffserv for short). It
uses the first 6 bits of the ToS field therefore giving 64 possible values.
The following list shows the most common DSCP code points with their binary
values and their associated names:
DSCP Code
Points
000000
001000
001010
001100
001110
010000
010010
010100
010110
011000
011010
011100
011110
100000
100001
100100
100110
Delay Throughput
Binary Values
0 Best Effort (BE)
8 Class Selector 1 (CS1)
10 Assured Forwarding 11 (AF11)
12 Assured Forwarding 12 (AF12)
14 Assured Forwarding 13 (AF13)
16 Class Selector 2 (CS2)
18 Assured Forwarding 21 (AF21)
20 Assured Forwarding 22 (AF22)
22 Assured Forwarding 23 (AF23)
24 Class Selector 3 (CS3)
26 Assured Forwarding 31 (AF31)
28 Assured Forwarding 32 (AF32)
30 Assured Forwarding 33 (AF33)
32 Class Selector 4 (CS4)
34 Assured Forwarding 41 (AF41)
36 Assured Forwarding 42 (AF42)
38 Assured Forwarding 43 (AF 43)
Reliability Cost
Names
Issue 6.0
Not Used
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