Cisco Cisco 1 GHz GainStar Amplifier Installation Guide
Balancing and Setup
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3 Measure the input level, and compare it with the design level.
If the Signal Director is installed, add 20 dB (single input) or 23.5 dB (dual inputs)
to the measured levels to get the true input levels.
If the DC8 Directional Coupler is installed, add 20 dB (single input) or 21.8 dB
(Main port input) /28.4 dB (Aux port input) to the measured levels to get the
true input levels.
If the DC12 Directional Coupler is installed, add 20 dB (single input) or 21.0 dB
(Main port input) /32.8 dB (Aux port input) to the measured levels to get the
true input levels.
to the measured levels to get the true input levels.
If the DC8 Directional Coupler is installed, add 20 dB (single input) or 21.8 dB
(Main port input) /28.4 dB (Aux port input) to the measured levels to get the
true input levels.
If the DC12 Directional Coupler is installed, add 20 dB (single input) or 21.0 dB
(Main port input) /32.8 dB (Aux port input) to the measured levels to get the
true input levels.
4 Are the input levels within the design limits?
If yes, proceed to step 5.
If no, or if no signals are present, find the problem before proceeding. You
cannot balance the GainStar Line Extender without proper input signals.
cannot balance the GainStar Line Extender without proper input signals.
5 Remove the test probe from the forward input test point, leaving other
equipment connectors in place.
To Set Up the Reverse Output Level
Complete the following steps to test the reverse output level.
1 Connect the test equipment to the reverse output test point shown in the
1 Connect the test equipment to the reverse output test point shown in the
illustration below.