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Selecting Test Features
Adding Pointer Adjustments
Initialization Period
For SINGLE e), BURST f) and PHASE TRANSIENT sequences the initialization
sequence consists of 60 seconds of pointer adjustments applied at a rate of 2
adjustments per second and in the same direction as the specified pointer sequence.
Cool Down Period
A period following the initialization period which for SINGLE e), BURST f) and
PHASE TRANSIENT sequences is 30 seconds long when no pointer activity is
present.
Sequence (Measurement) Period
The period following the Cool Down period where the specified pointer sequence
runs continuously.
Periodic Test Sequences
For periodic test sequences (for example "PERIODIC ADD g/h") both the 60
second initialization and 30 second cool down periods consist of the same sequence
as used for the subsequent measurement sequence. If the product of the period T and
the selected optional background pattern (87+3 or 26+1) exceeds 60 seconds then
the longer period is used for the initialization. For example, if T is set for 10 seconds
then the initialization period may be extended to 900 seconds.
The OmniBER 718 displays a message indicating which phase (initialization, cool
down or measurement) the transmitter is currently generating.
N O T E
The following conditions apply for pointer sequence generation:
The sequences can only be applied to the AU pointer when the AU does not contain
a TU structure, otherwise it is applied to the TU pointer. Pointer sequence generation
is not available when a frequency offset is being applied to the Line Rate.
The following figure gives an example of a G.783 (g) 87-3 Pointer Sequence.
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