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Without
TPS or ARS, the delay of two voice calls from the NOC
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were
both 1.4 +/- 0.3 seconds at high load, far less than an
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generally
accepted maximum of 500 ms.
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In
order to improve utilization of the network, an MPLS overlay
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was
introduced to allow traffic travelling to Ship 4 to take
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different
routes depending on the application type and priority.
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In
this case high priority voice traffic was to travel via Ship 3 while
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all
other traffic will travel over the default route via Ship 1.
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With
the combination of TPS and ARS, the impact on the delay of
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voice
packets is significant.
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The
high-priority voice call which is taking the alternate lightly
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loaded
route via Ship 3 has a delay of 0.19 +/- 0.03 seconds while the
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lower
priority voice call which uses the default route has a delay of
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0.43
+/- 0.10 seconds.
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