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Selecting Test Features
T1.105/GR-253 Pointer Sequences Explained
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 HP 37717C displays a message indicating which phase
(initialization, cool down or measurement) the transmitter is currently
generating.
NOTE 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.
T1.105 A4 and A5, 87-3 Pattern
An Example of a Pointer Sequence
Pointer Adjustment
87
No Pointer
Adjustment
Start of Next
87-3 Pattern
3
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