Selecting Test Features
Adding Frequency Offset to SONET Signal
Tributary Offset ±100 ppm1Choose the amount of tributary offset required.
You can set the Offset in the range
steps using DECREASE DIGIT 
INCREASE DIGIT 
and 
.
The amount of applied Frequency Offset can be varied while measurements are taking place.
Tributary offset affects the stuff rate but does not cause pointer movements and can be used to test mapping jitter. If the combined value of SONET line rate offset and tributary offset chosen is sufficient to cause the maximum stuff rate to be exceeded the payload is offset to prevent bit errors occurring and the maximum stuff rate is maintained.
32