NT10G05 USER MANUAL
76-02-105 Rev.B
Page 71 of 80
The training period is defined in seconds and may be between 1 and 30 seconds.
4.2.3.3.1.5 Training Frames per Second
During the training period the training FPS defines the rate of test packet generation.
It is advisable to keep this to a fairly low level, though above 1000 to ensure that no
buffers will be affected during the training period which would then be
counterproductive for the real test.
4.2.3.3.1.6 Background Rate
If multiple peers have been configured, and sequential test mode is selected then as
the test cycles through testing each peer in turn, background traffic is generated at a
percentage of their SLA.
4.2.3.3.1.7 Colour Aware
In networks where policing is deployed typically a three colour system is adopted
where Green is used to indicate frames within CIR, Yellow frames within EIR and
finally RED which exceed the CIR+EIR and are discarded.
Where a network has multiple policers it may well be that frames initially classified
green subsequently get classified yellow, and yellow ones get discarded as red. To
minimise this issue colour aware policing will only police green frames against the
CIR, and yellow frames against the EIR leading to better performance.
If the NT10G05 Y.1564 test is set for colour aware mode, and the SLA defines both
CIR and EIR then two streams will be generated with green or yellow frames, if
colour aware mode is disabled, then only green frames are transmitted.
4.2.3.3.1.8 Stop on Fail
The first phase of the Y.1564 test is a simple Go/No Go test which will verify that the
basic SLA can be met. If during this test it fails then the test will stop and allow the
user to diagnose the problem.
One problem that may often cause the test to fail is the CIR step test at 100%
loading. Due to the short nature of the step tests, 3 seconds, buffering will normally
cope however it is vital that the external tag parameter of the SLA is correctly
defined.
If stop on fail is disabled, the test will continue through all steps and then run the
performance test regardless of test pass or failure.
