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Installation and Verification Manual
12 Reduce the Optical Attenuator setting by a further 20 dB and
check the Receiver Optical Power result is between:
13 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.
14 Disable the Optical Attenuator then disconnect the Optical
signal from the Transmission Test Set Optical IN port and
connect to the Power Meter. Re-enable the Optical
Attenuator.
15 Check the Power Meter reading is between:
16 Repeat step 4 through step 15, substituting SIGNAL RATE
[OC-3] in step 5.
OC-12/STM-4 Rate
17 Set the Transmission Test Set Transmitter to provide OC-12
output with PRBS bulk payload as follows:
Press <Menu>, choose Tx/Rx > Transmitter Settings then
press <Select>. Select the Physical tab. Set Signal Rate to
OC12, Wavelength 1310 nm (or if this is not fitted, select
1550 nm). Ensure the Laser is set to ON.
Check the laser LED is illuminated at the selected Output
Port.
Ensure the Optical Attenuator and Optical power meter are
set for the Wavelength being used.
18 Adjust the Optical Attenuator to obtain a reading of –28 dBm
on the Power Meter (that is, the Receiver minimum
sensitivity for 622 Mb/s rates). Take note of the Attenuator
setting.
19 Set the Optical Attenuator to Disable mode.
Note: do not switch OFF the Transmission Test Set laser.
–11 dBm and –9 dBm
–10.5 dBm and –9.5 dBm
Performance Tests
105
3
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