Cisco GS7000 Installation And Operation Manual page 45

Reverse Amplifier PWB
Reverse Amplifier IC
with Integrated Attenuator
Digital Att
LPF
(Off - 0 - 6 dB)
Digital Control
Digital Att
LPF
(Off - 0 - 6 dB)
Digital Control
Digital Att
LPF
(Off - 0 - 6 dB)
Digital Control
Digital Att
LPF
(Off - 0 - 6 dB)
Digital Control
Parallel
Output
Reverse Amplifier
Digital Control Circuitry
To Forward
Amplifier
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
RF
Switch
Trim
EN
RF
Switch
Trim
EN
Reverse
Config.
Module
RF
Switch
Trim
Reverse
Aux.
EN
Jumper/
Comb./
Amp./
Term./
Module
RF
Switch
Trim
EN
Serial
Input
Optical Interface PWB
Pad
T4
T3 Pad
T2 Pad
Pad
T1 Pad
T4
T3
Control
T2
T1 RF
Switch
R1 Pad
R2 Pad
Pad
R3
Pad
R4
Field Accessable
Split Upgrade
RF Amplifier Module
Transmitter 4
Transmitter 3
Transmitter 2
Transmitter 1
Status Monitor or
Local Control Module
Receiver 1
Receiver 2
Receiver 3
Receiver 4
Power Supply 1
Power Supply 2
Field Accessable
Plug-In
25