Cisco GS7000 Installation And Operation Manual page 37

RF Amplifier Module
paths comprised of an AC bypass circuit, a bi-directional 20 dB down reverse test
point, a diplex filter, and an input pad. After the input pads, the reverse signals
from ports 1 and 2 (left), and ports 4 and 5 (right) are each combined with separate
2-way combiners. After combining, each (left and right) combined path includes a
low pass filter, a 6 dB switched attenuator, a gain block, an RF on/off switch, and a
frequency response trim circuit. After the frequency response trim circuits, the left
and right paths can be combined or remain segmented based on the position of the
reverse configuration control switch. The 6 dB switched attenuator and RF on/off
switch circuits allow the left and right reverse paths to have 6 dB (wink) and on/off
capabilities. These circuits are controllable from the headend via the status monitor
or locally via the local control module and a hand held controller. A serial
communication link is provided between status monitor or local control module and
the reverse band launch amplifier. Circuitry on the amplifier converts the serial
communications to parallel control signals and routes them as needed.
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