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Verification.book Page 53 Monday, January 19, 2004 1:40 PM
Verification Manual
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20 Ensure the OmniBER OTN is set to TX>RX Coupled Mode.
21 Press <Smart Test>, choose Shortcuts > Trouble Scan then
press <Select>. Press <Run/Stop> to begin measurement.
After 1 minute check that 'No Trouble' is displayed in the
Results window to confirm no errors have been detected.
22 Increase the optical attenuator setting to find the point just
before the occurrence of errors by observing the Errors LED
while adjusting attenuator. Record the additional attenuation
setting. (typically, this will be at least 1 dB). Press
<Run/Stop> to stop measurement.
23 Re-set the optical attenuator to the setting noted in
(providing –28 dBm output)
Set the OmniBER OTN's receiver to display Optical Power.
Press <Smart Test>, choose Shortcuts > Optical Power then
press <Select>. Set Wavelength to 1310/1550 nm as
appropriate and check that the optical power measurement
reads between:
–29 dBm and –27 dBm
Set the OmniBER OTN's receiver to display Frequency and
check that the frequency measurement reads between:
622.07999 MHz and 622.08001 MHz
24 Decrease the optical attenuator setting by a further 20 dB
and check the receiver Optical Power result is between:
–9 dBm and –7 dBm
25 Press <Smart Test>, choose Shortcuts > Trouble Scan then
press <Select>. Press <Run/Stop> to begin measurement.
After 1 minute check that 'No Trouble' is displayed in the
Results window to confirm no errors have been detected.
Press <Run/Stop> to stop measurement.
26 Disable the optical attenuator then disconnect the optical
signal from the OmniBER OTN Optical IN port and connect
to the power meter. Re-enable the optical attenuator.
27 Check the power meter reading is between:
1
Performance Tests
step
18.
53
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