10
4. Block diagram
ONR 201 assembled with 3x ONR-M 200
5. Start-up of the return path receiver
After earthing the device, connect the power cable to the mains and switch the device on. The safety instructions
(see section 1) must be observed.
When the device is switched on and the power supply is working, the
“Power“ indicator LED lights up red.
After the fibre optic cable is connected to the device and an input signal is detected, the
“Signal ON“ LED lights
green.
If the optical input power is too high, the laser power in the distribution network must be minimised or adapted via
optical attenuators. If the optical input power is too low, it should be increased in the distribution network. Otherwise
the signal performance (signal-to-noise ratio, SNR) will be degraded.
ATTENTION
The optical power may not exceed 3 mW (4.8 dBm), otherwise the optical receiving module may be damaged.
The optical input signal must be in the range of -6 dBm to +3 dBm. If the optical input signal has been adjusted cor-
rectly, the level control (0-15 dB) can be used to configure the desired RF output level. The check can be done at the
RF test point (-20 dB).
LED Indicator
Opt. receiver
Amplifier
1
Attenuator
Equalizer
Amplifier
2
Opt.
IN 1
RF OUT
RF Test
-20 dB
ONR-M 200
Opt.
IN 2
RF OUT
RF Test
-20 dB
ONR-M 200
Opt.
IN 3
RF OUT
RF Test
-20 dB
ONR-M 200
LED Indicator
LED Indicator
