VoIP Service 231
SBX IP 320 Features & Operation Guide
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) TOS
00000
100132
201064
301196
4 100 128
5 101 160
6 110 192
7 111 224
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
• Precedence value (PGM 340 - F 21)
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