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SONET_Usr.bk Page 89 Wednesday, December 13, 2000 11:11 AM
Selecting Test Features - SONET Operation
Adding Pointer Adjustments
Initialization Period
For SINGLE A1, BURST A2 and PHASE TRANSIENT A3 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 GR-253 SINGLE e) and
BURST f) sequences, 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) 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 720 displays a message indicating which phase (initialization, cool
down or measurement) the transmitter is currently generating.
NOT E
The following conditions apply for pointer sequence generation:
The sequences can only be applied to the SPE pointer when the SPE does not contain
a VT structure, otherwise it is applied to the VT 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 T1.105/GR-253, 87-3 Pointer Sequence.
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