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SONET_Usr.bk Page 52 Wednesday, December 13, 2000 11:11 AM
Selecting Test Features - SDH Operation
Using Pointer Graph Test Function
Pointer Graph shows the relative offset during the measurement period. This allows
the time relationship of AU or TU pointer movements to be observed. Up to 4 days
of storage allows long term effects such as Wander to be observed. If an alarm
occurs during the measurement period, a new graph starts at the centre of the display
(offset zero) after recovery from the alarm.
TIP:
The Pointer Graph display can be logged to the chosen logging device. See
TIP:
The graph can also be viewed on the
end of the measurement.
1 Set up the receive SDH interface and payload as required. See "Setting Receive
HOW TO:
2 On the RECEIVE Test Function page, select
52
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Using Pointer Graph Test Function
"Logging on Demand " page 146.
Interface" page 70.
CAPTURE INTERVAL required.
The capture interval determines the time between captures. Low values of capture
interval should be chosen when a high degree of pointer movements is expected.
High values of capture interval should be chosen when a low degree of pointer
movements is expected, for example Wander over 1 day, use 5 MINS and Wander
over 4 days, use 20 MINS.
If, during a long term measurement (4 days), an event occurs at a particular time
each day, then the instrument can be set to log the results graph of that event.
SDH RESULTS
RESULTS
then choose the
PTR GRAPH
display at the
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