Cisco GainMaker Optoelectronic Node 1GHz with 65 86 MHz Split Guida All'Installazione
Balancing the Reverse Path
Communicating Test Results
The technician monitoring the received signals first determines the variance in
The technician monitoring the received signals first determines the variance in
relative amplitude of the received signal from desired reference value, and then
makes any needed adjustments to the receiver optical output level.
If a portable reverse sweep generator with built-in forward data receiver is used to
If a portable reverse sweep generator with built-in forward data receiver is used to
generate the reverse test signals, two people are still required to perform the
balancing of the fiber link. This type of system is becoming increasingly popular due
to its ease of use, especially when aligning the reverse amplifier cascade.
In this case, the sweep system includes a combination reverse sweep receiver and
In this case, the sweep system includes a combination reverse sweep receiver and
forward data transmitter, which is located in the headend or 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 path as a data carrier, by combining it into the forward
headend combiner.
The portable sweep generator or data receiver that is injecting the test signals into
The portable sweep generator or data receiver that is injecting the test signals into
the reverse path in the field is simultaneously receiving the incoming data carrier via
the forward RF path and converting it back to a sweep display which represents
what is being received by the headend unit.
While one technician in the field can monitor the received amplitude and determine
While one technician in the field can monitor the received amplitude and determine
whether it deviates from reference or not, any variation in amplitude required at the
output of the receiver in the headend would typically be accomplished by a second
technician in the headend, who is in communication with the technician in the field.
The specific steps for balancing the reverse fiber link are detailed in the next section.
The specific steps for balancing the reverse fiber link are detailed in the next section.
Balancing and Alignment Procedures
This procedure applies whether balancing the reverse along with the forward or
balancing the reverse independently. It requires one technician at the GainMaker
Node and one technician at the headend or hub site to set up the reverse fiber link.
Note: It is recommended that you set up the link with the highest optical loss budget
Note: It is recommended that you set up the link with the highest optical loss budget
first. Always balance the reverse fiber link before attempting to balance any of the
reverse amplifiers in the distribution plant.
Complete the following steps to balance the reverse fiber link.
1 Ensure that the design value reverse pads are installed in the appropriate reverse
Complete the following steps to balance the reverse fiber link.
1 Ensure that the design value reverse pads are installed in the appropriate reverse
pad slots in the launch amplifier and reverse optical transmitter input. The
reverse pads are as follows:
Reverse main input pad for each station port
Reverse output pad
Reverse transmitter input pad
Note: See illustration in step 4 for location of the reverse transmitter input pad.
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