Cisco Cisco 1 GHz GainMaker Amplifier インストールガイド

6 

 

4022872 Rev B 

 

If the network is experiencing a build-up of frown-shaped frequency response, 
selectively replacing some amplifier cable equalizers with linear equalizers may 
reduce the magnitude of the frequency response frown. 

Since there will always be cable induced down-tilt, replacing all of the cable 
equalizers with linear equalizers is not recommended, as this would likely produce 
an excessive amount of smile shape in the network response. Instead, selective 
replacement of cable equalizers should be limited to interstage equalizers, as further 
explained below. 

 

The interstage cable equalizers in GainMaker amplifiers may be selectively replaced 
with linear equalizers to implement a gradual, controlled degree of alternative 
frequency response shaping. 

By limiting the change to the interstage, the quantity of linear equalizer values 
required is minimized. Additionally, the potential for an excessive degree of linear 
equalization is reduced, as the amount of equalization used in the interstage is 
typically less than that used in the input equalizer location. 

Whether it is desirable to replace the interstage equalizers in all of the amplifiers in 
the network, just those in the feeder portion, or on a more limited basis will depend 
upon the net effect achieved in practice in any particular network. 

Note that optional plug-in trim networks are also available to shape and improve 
frequency response in netowrks deploying GainMaker amplifiers. Such trim 
networks may be used alone or in combination with the selective use of linear 
equalizers to help improve overall frequency response.