Forward Band Amplification 4-Way Path Description
The RF amplifier module provides all forward signal amplification outside the
optical receiver modules in the GS7000 Node.
The 4-way segmentable launch amplifier contains four independent forward
amplification paths, each having one input near the center of the amplifier module
and one, two or three outputs at one end of the amplifier module. Each of the
forward paths is comprised of the forward configuration module, an input gain
block, a frequency response trim circuit, a thermal compensation circuit, an
inter-stage pad, a 2-way splitter or RF switch circuit, an inter-stage gain block, a
plug-in forward band linear equalizer, an output pad, an output gain block, a diplex
filter, a bi-directional 20 dB down forward test point, and finally an AC bypass
circuit.
The thermal circuit on the RF amplifier module is designed to compensate for the RF
forward path thermal movement of the entire node RF station. This includes the
forward path amplifier module circuitry, RF cables, and optical interface board
Reverse Amplifier PWB
Reverse Amplifier IC
with Integrated Attenuator
Digital Att
(Off - 0 - 6 dB)
Trim
RF
Switch
Trim
RF
Switch
Trim
RF
Switch
Trim
RF
Switch
Reverse Amplifier
Digital Control Circuitry
Digital Control
Digital Control
Parallel
Output
Digital Control
Digital Control
Reverse
Aux.
Jumper/
Comb./
Amp./
Term./
Module
LPF
LPF
LPF
LPF
Serial
Input
T4
T2
T1
T3
. . .
Optical Interface PWB
Status Monitor or
Local Control Module
Receiver 1
Receiver 2
Receiver 3
Receiver 4
Power Supply 1
Power Supply 2
Pad
Pad
Pad
Pad
R1
R2
R3
R4
RF
Switch
To Forward
Amplifier
Reverse
Config.
Module
Control
Digital Att
(Off - 0 - 6 dB)
Digital Att
(Off - 0 - 6 dB)
Digital Att
(Off - 0 - 6 dB)
EN
EN
EN
EN
Transmitter 4
Transmitter 3
Transmitter 2
Transmitter 1
Pad
Pad
Pad
T4
T2
T3
T1
Pad
Pad
Field Accessable
Plug-In
Field Accessable
Split Upgrade
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