Cisco Cisco 1 GHz GainStar Node Installation Guide
Chapter 3 Balancing and Setup
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2 Measure the input level, and compare it with the design level. The recommended
input range is 5 dBmV/ch to 20 dBmV/ch.
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
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
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.
true input levels.
3 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 Mini Node without proper input signals.
cannot balance the GainStar Mini Node without proper input signals.
4 Remove the test probe from the reverse input test point, leaving other equipment
connectors in place.
To Set Up the Equalizer Values for Reverse Path
42 MHz Platform
The reverse output tilt can be adjusted using the Reverse Equalizer (EQ). Each EQ
has a range of values. The EQ value is set by installing the corresponding attenuator
pad. There are two types of reverse EQs for the 42 MHz Platform: 0 dB to 5 dB, P/N
4034465; 6 dB to 10 dB, P/N 4034466. See the table below for the full range of
configurations for the 42 MHz Platform EQs.
has a range of values. The EQ value is set by installing the corresponding attenuator
pad. There are two types of reverse EQs for the 42 MHz Platform: 0 dB to 5 dB, P/N
4034465; 6 dB to 10 dB, P/N 4034466. See the table below for the full range of
configurations for the 42 MHz Platform EQs.
Reverse
Equalization
Reverse Equalizer
Pad for Reverse Equalizer
Description
PN
Description
PN
0 dB *
GS Rev
Cable EQ, 0
to 5 dB 42
MHz
Platform
Cable EQ, 0
to 5 dB 42
MHz
Platform
4034465
0 dB 1 GHz Plug-In Attenuator
4036021
1 dB
1 dB 1 GHz Plug-In Attenuator
4036022
2 dB
2 dB 1 GHz Plug-In Attenuator
4036023
3 dB
3 dB 1 GHz Plug-In Attenuator
4036024
4 dB
4 dB 1 GHz Plug-In Attenuator
4036025
5 dB
5 dB 1 GHz Plug-In Attenuator
4036026
6 dB
GS Rev
Cable EQ, 6
to 10 dB 42
MHz
Platform
Cable EQ, 6
to 10 dB 42
MHz
Platform
4034466
6 dB 1 GHz Plug-In Attenuator
4036027
7 dB
7 dB 1 GHz Plug-In Attenuator
4036028
8 dB
8 dB 1 GHz Plug-In Attenuator
4036029
9 dB
9 dB 1 GHz Plug-In Attenuator
4036030