Cisco Cisco 1 GHz GainMaker Amplifier Guida All'Installazione
Chapter 3 Balancing and Setup
Insert the appropriate signal amplitude into the reverse injection point. Refer to the
following illustration.
Proceed to To Complete Reverse Path Balancing (on page 76).
To Complete Reverse Path Balancing
Complete the following steps to finish the amplifier setup.
1 Monitor the tilt of the signals being received at the headend or hub reverse optical
1 Monitor the tilt of the signals being received at the headend or hub reverse optical
receiver RF output test point.
Note:
Note:
The tilt is the difference in signal level between the highest and lowest
frequencies in the reverse passband, or between the highest and lowest
frequency CW test signals.
Most systems prefer to have minimal reverse tilt (flat levels) at the headend.
To minimize tilt, change the value of the amplifier reverse output equalizer.
2 Monitor the amplitude (level) of the signals being received at the headend or hub
reverse optical receiver RF output test point.
a Compare the received level to the reference level desired.
b If using a sweep system that is x dB below standard CW carrier levels, be sure
a Compare the received level to the reference level desired.
b If using a sweep system that is x dB below standard CW carrier levels, be sure
to consider that the receive level should also be x dB below the CW reference
level.
c To adjust the receive level to make it match the desired reference level, alter
the value of the amplifier reverse output pad. Each 1 dB increase in pad value
should result in a corresponding 1 dB decrease in receive level, and each 1 dB
decrease in pad value should give a 1 dB increase in receive level.
3 Once the proper receive level and tilt of the test signals have been achieved,
properly close the amplifier housing and repeat the process at the next reverse
amplifier in the downstream cascade.
Important:
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