Vertical SBX IP 320 Features & Operation Manual page 241

VoIP Service
Executing "ping2" for different TOS with no load.
The modified NIKHEF ping code was run from nereus.slac.stanford.edutonocdev1-qos.es.net
with TOS: 0, 32, 64, 96, 128, 160, 192, 224 & No TOS specification. The code was run for
10,000 packets of each TOS. The TOS numbers represent the precedence bits as follows.
PRECEDENCE BITS (0,1,2)
0
1
2
3
4
5
6
7
Precedence 0 (TOS 0) is NORMAL PRECEDENCE (low precedence) while precedence 7
(TOS 224) is called network control (High precedence).
Since there is no load on the line, one would expect the TOS to have no effect on the ping
statistics. Rightly so, we see from the chart that the obtained results are similar to the predicted
results.
Admin Programming
•
000
001
010
011
100
101
110
111
Precedence value (PGM 340 - F 21)
SBX IP 320 Features & Operation Guide
TOS
0
32
64
96
128
160
192
224
231