Руководство По Установке для Cisco GainMaker Optoelectronic Node 1GHz with 65 86 MHz Split
Balancing the Reverse Path
Balancing and Alignment Procedures
This procedure applies whether balancing the reverse along with the forward or if
balancing the reverse independently. It requires one technician at the node and one
technician at the headend or hub site to set up the reverse fiber link.
It is good practice to set up the link with the highest optical loss budget first, and to
It is good practice to set up the link with the highest optical loss budget first, and to
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 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.
2 Refer to the reverse system design print and inject the proper RF signal level into
the amplifier via the reverse injection test point. For the exact location of the
reverse injection test point, refer to the illustration in step 1.
The reverse system design print should specify a “design” reverse input level at
The reverse system design print should specify a “design” reverse input level at
the station’s reverse input port(s). You must inject the correct signal level into the
reverse injection test point using an RF test probe and a reverse sweep
transmitter or a CW signal generator. The reverse injection test point has 20 dB of
insertion loss (-20 dB injection point).
Note: To calculate the correct signal level to inject, you must first calculate the
Note: To calculate the correct signal level to inject, you must first calculate the
input level to the reverse amplifier module.
Example:
Example:
OL-29644-03
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