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Making Measurements
Measuring Jitter Tolerance
2 If you have chosen a PDH/DSn interface now select the JITTER page and select
AUTO TOLERANCE and a MASK (see previous display). Proceed to step 6.
SDH Interface
3 If you are performing jitter tolerance on an SDH Optical signal, check on the
RESULTS
optical power level falls within the white portion of the coloured bar
the accuracy of the Jitter results.
4 If you are performing jitter tolerance on the SDH signal, set up the SDH transmit
and receive interfaces, including the required test PATTERN. See "Setting SDH
Transmit Interface" page 29 and "Setting SDH Receive Interface" page 49.
5 If you have chosen an SDH interface now select the JITTER page and select
AUTO TOLERANCE and a MASK (see display above).
Steps common to PDH/DSn and SDH operation
6
Choose the NUMBER OF POINTS at which jitter is transmitted (3 to 55)
7 Choose the DWELL TIME - the time jitter is generated at each jitter frequency
point (0.1 to 99.9 seconds).
8 Choose the DELAY TIME - the time delay between the jitter frequency/
amplitude being applied and the error measurement being made. This allows the
network equipment to settle as jitter frequency is changed. (0.1 to 99.9 seconds).
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SDH RESULTS
OPTICAL POWER
display that the measured
This ensures
.
139
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