Cisco GainMaker Optoelectronic Node 1GHz with 65 86 MHz Split Installation Guide

 

Spectrum analyzer (when using a CW generator for test signals) 

 

Signal level meter (when using a CW generator for test signals) 

 

Reverse sweep receiver (when using a reverse sweep transmitter for test signal) 

The variance in relative amplitude of the received signal from desired (reference) 

may be relayed to the field technician via the following: 

 

Radio (by a second technician in the headend/hub who is monitoring a spectrum 

analyzer or signal level meter) 

 

A dedicated forward TV channel, whose associated modulator has its video 

input being generated by a video camera focused on the spectrum analyzer 

display 

 

An associated forward data carrier (if using a particular type of reverse sweep 

system)   

If a portable reverse sweep generator with built-in forward data receiver is used to 

generate the reverse test signals, only one technician is required to perform the 

balancing.    This type of system is becoming increasingly popular due to its ease of 

use. 
In this case, the sweep system includes a combination reverse sweep receiver and 

forward data transmitter, which is located in the headend/hub.    The frequency 

response characteristics of the received sweep signal (including relative amplitude 

and tilt) are converted by the headend sweep receiver to a data format, and 

transmitted in the forward RF path as a data carrier (by combining it into the 

forward headend combiner). The portable sweep generator/data receiver that is 

injecting the test signal into the RF launch amplifier's reverse path in the field is 

simultaneously receiving the incoming data carrier via the forward RF path.    The 

incoming data is converted back to a sweep display that represents what is being 

received by the headend unit. 

 

Overview 
The Enhanced Digital Return (EDR) technology is designed to have a constant link 

gain, regardless of the length of fiber or amount of passive optical loss in the link. 

That is, if the RF signal amplitude of all ports in all nodes is set to a constant value, 

the signal level at the output of the receiver will be balanced automatically to a 

constant power level. Minor differences in levels can be trimmed out at the receiver 

with no penalty to link performance. 

Balancing and Alignment 
Follow these steps to reverse balance and align the node with digital reverse 

modules. 

 

OL-30035-03 

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