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8
Setting the Interfaces
Setting Jitter Transmit Interface
5 Choose the modulation source.
If adding jitter to the DSn signal and is chosen, connect
the external source to the MOD IN port of the DSn Jitter TX module.
Up to 10 UI of external jitter modulation can be added at the MOD IN
port.
If adding jitter to the SDH signal and is chosen, connect
the external source to the MOD IN port of the SONET Clock module.
Up to 20 UI of external jitter modulation can be added at the MOD IN
port.
6 Choose the JITTER MASK setting required.
You can choose the jitter range, jitter modulating frequency and jitter
amplitude if is chosen.
If you choose , the HP 37718A will "sweep" through the ITU-T
jitter mask (G.823 for DSn, G.958, G.825 or G.253 for SONET)
adjusting the jitter amplitude according to the jitter frequency.
If you choose , you can choose the "spot" jitter frequency. The
jitter amplitude is adjusted and controlled according to your jitter
frequency choice.
TIP: If, when using the SWEPT MASK capability, a problem occurs around a
certain frequency, this may require closer examination. Stop the sweep
at that point by choosing . You can then control the "spot" jitter
frequency to make closer examination of the problem.
EXTERNAL
EXTERNAL
OFF
SWEPT
SPOT
SPOT