Cisco Cisco 1 GHz GainMaker Amplifier インストールガイド
Balancing the Reverse Path
81
from line extender to line extender and from port to port.
An alternative to this method is to expect a receive level that is x dB lower than
normal, where x is the value of the reverse input pad on the port being balanced,
which you noted earlier in the reverse path balancing procedure.
normal, where x is the value of the reverse input pad on the port being balanced,
which you noted earlier in the reverse path balancing procedure.
Insert the appropriate signal amplitude into the reverse injection point. Refer to the
following illustration.
following illustration.
Proceed to To Complete Reverse Path Balancing (on page 81).
To Complete Reverse Path Balancing
Complete the following steps to finish the line extender setup.
1 Monitor the tilt of the signals being received at the headend or hub reverse
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.
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 line extender reverse output
equalizer.
equalizer.
2 Monitor the amplitude (level) of the signals being received at the headend or hub