Exfo ETS-1000 Uživatelský manuál stáhnout pdf (Strana 44)

Typical Tasks and Solutions

36 ETS-1000

RFC 2544 Methodology

Frame Loss Rate

This test allows to estimate network’s ability to support real-time operating

applications because the big loss percentage will result in service quality

degrading.

Frame loss test allows to count the percentage of frames that have not

been transmitted by DUT due to lack of hardware resources.

To test the frame loss rate, a specific number of frames (input count) is

sent at a specific rate through the DUT to be tested and then the analyzer

counts the frames that are transmitted by the DUT (output count). The

frame loss rate at each point is calculated using the following equation:

100 × (input count - output count) / (input count)

The first trial should be run for the frame rate that corresponds to 100% of

the maximum rate for the frame size on the input media. Repeat the

procedure for the rate that corresponds to 90% of the maximum rate used

and then for 80% of this rate. The trials are continued with 10% reducing

intervals (a finer granularity is supported) until there are two successive

trials in which no frames are lost.

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Exfo ETS-1000 Uživatelský manuál Strana 44