IP Network Measurement Division
51
40G Quick Start Guide
（
Jitter
）
4
4
-
-
2.
2.
Jitter Tolerance Measurement
Jitter Tolerance Measurement
Perform 1dB penalty test before Jitter Tolerance measurement.
1. Insert an optical attenuator between the measuring equipment and DUT.
2. Attenuate the optical signal with the variable optical attenuator and set the
attenuation amount (dB) so that the Error rate monitored by the 40G BERT
becomes the threshold value used at Jitter Tolerance measurement. We
recommend 10E-09 at Bit error for the threshold value.
3. Set the optical attenuator to a value 1 dB larger than the attenuation
measured in step (2) and start the Jitter Tolerance measurement.
40G BERT
+
MP1797A
Variable
Opt ATT
DUT
The 1dB penalty setting is not required when the DUT input is electrical.
IP Network Measurement Division
52
40G Quick Start Guide
（
Jitter
）
4
4
-
-
3.
3.
Jitter Tolerance Measurement
Jitter Tolerance Measurement
The Waiting time setting is normally 5s.
If you know the DUT makes functional recovery less than 5s,
you can set the less time to the waiting time.
Measurement Target
Error/Alarm
Settings
Start the MX179701B and
select Display
→
Test
Menu, Result and
Analysis.
After setting the standard,
mask and Error/Alarm
measurement targets,
etc., click the Start button
to start measurement.
26