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Making Measurements
Measuring Wander
4 If measuring wander at a SONET rate set up the SONET receive
interface. See, “Setting SONET Receive Interface” page 17.
5 Choose MEASUREMENT TYPE .
6 Choose the WANDER HIT THRESHOLD level - if the received wander
exceeds the value chosen a wander hit is recorded.
7 Press to start the measurement.
HOW TO: View the Results
1 Choose on the display and choose the display units
required:
TIME displays the wander results in nanoseconds.
UI displays the wander results in Unit Intervals
If you are measuring wander at 2 Mb/s Estimated Bit slips and
Estimated Frame slip results are provided and a choice is
added to the menu.
If is chosen the cumulative wander results are displayed in
graphical form. The Graphs are additive and in the example shown
above the Wander is -76.5 BITS.
NOTE Estimated Bit Slips signify the slippage from the start of the
measurement.
One Estimated Frame Slip corresponds to 256 Bit Slips.
Implied Frequency Offset is calculated from the Wander results.
WANDER
RUN/STOP
WANDER
RESULTS
GRAPH
GRAPH