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Verification.book Page 58 Monday, January 19, 2004 1:40 PM
1
Performance Tests
58
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4 Set the OmniBER OTN Transmitter to provide OC-192 output
with PRBS bulk payload as follows:
Press <Menu>, choose Tx/Rx > Transmitter Settings >
Physical then press <Select>. Set the Signal Mode to SONET
and the Signal Rate to OC192. Ensure the Laser is set to ON.
Check the laser LED is illuminated at the 9.95/10.71 Gb/s
optical out port.
5 Adjust the optical attenuator to obtain a reading of –18 dBm
on the power meter (that is, the receiver minimum sensitivity
for 9.95 Gb/s rate). Take note of the attenuator setting.
6 Set the optical attenuator to Disable mode.
Note: do not switch OFF the OmniBER OTN laser.
Disconnect the optical attenuator output from the power
meter and connect to the OmniBER OTN's Optical IN port
(9.95/10.71 Gb/s). Ensure all optical connectors are clean
and all connections are tight with no twists in the optical
cable. Set the optical attenuator to Enable.
7 Set the OmniBER OTN to TX>RX Coupled Mode.
8 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.
9 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.
10 Re-set optical attenuator to the setting noted in
(providing –18dBm output).
Set the OmniBER OTN's receiver to display Optical Power
and check that the optical power measurement reads
between:
–19.5 dBm and –16.5 dBm
step 5
Verification Manual
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