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Making Measurements
Measuring Jitter Tolerance
Jitter is generated at a range of frequencies within the mask and an error
measurement is made. If no errors occur (PASS), the jitter amplitude at that
frequency point is increased until errors do occur (FAIL) or the maximum jitter
amplitude is reached. The highest jitter amplitude at which PASS occurs is plotted
on the graph as the Jitter Tolerance for that jitter frequency.
User-Programmable Masks
There are 5 user programmable masks provided allowing you to create, edit and title
up to 5 jitter masks. Please refer to "To Generate a New Jitter Mask" on page 317
and "To change the parameters of a User Defined Jitter Mask" on page 319 for
instructions on how to generate or edit a user programmable mask.
TIP:
The transmitter and receiver can be set to different rates to allow testing across
multiplexers, for example transmitter set to STM-1 with embedded 34 Mb/s and
receiver set to 34 Mb/s.
HOW TO:
Make the Measurement
PDH/DSn Interface
1 If you are performing jitter tolerance on a PDH/DSn signal, set up the PDH/DSn
transmit and receive interfaces, including the required test PATTERN. See
"Setting PDH/DSn Transmit Interface (option 012)" page 26 and "Setting PDH/
DSn Receive Interface (Option 012)" page 47.
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