Cisco Model GS7000 4-Port Node 1 GHz with 42 54 Split インストールガイド
RF Amplifier Module
OL-29643-02
35
amplifier modules cover has been removed.
Reverse Band Amplification Path Description
The RF amplifier module provides all reverse signal amplification outside the optical
transmitter modules in the GS7000 Node. It contains four independent reverse paths
comprised of an AC bypass circuit, a bi-directional 20 dB down reverse test point, a
diplex filter, an input pad, a low pass filter, a 6 dB switched attenuator, a 16 dB gain
block, a second low pass filter, an RF on/off switch, a frequency response trim
circuit, and a reverse configuration module. The 6 dB switched attenuator and RF
on/off switch circuits allow each reverse path 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.
The RF amplifier module also provides the routing for the auxiliary ports, 5 to 210
MHz reverse band local injection signals. Each of the two auxiliary port reverse band
local injection paths is comprised of an AC bypass circuit, a bi-directional 20 dB
down reverse test point, an input pad, and a reverse auxiliary
jumper/amplifier/termination module. Signals from port 3 or port 6 of the nodes
auxiliary path are directed by the reverse auxiliary/jumper/amplifier/termination
module to the reverse configuration module.
transmitter modules in the GS7000 Node. It contains four independent reverse paths
comprised of an AC bypass circuit, a bi-directional 20 dB down reverse test point, a
diplex filter, an input pad, a low pass filter, a 6 dB switched attenuator, a 16 dB gain
block, a second low pass filter, an RF on/off switch, a frequency response trim
circuit, and a reverse configuration module. The 6 dB switched attenuator and RF
on/off switch circuits allow each reverse path 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.
The RF amplifier module also provides the routing for the auxiliary ports, 5 to 210
MHz reverse band local injection signals. Each of the two auxiliary port reverse band
local injection paths is comprised of an AC bypass circuit, a bi-directional 20 dB
down reverse test point, an input pad, and a reverse auxiliary
jumper/amplifier/termination module. Signals from port 3 or port 6 of the nodes
auxiliary path are directed by the reverse auxiliary/jumper/amplifier/termination
module to the reverse configuration module.
Reverse Configuration Module
The reverse configuration module determines the reverse path topology in the RF
amplifier module and GS7000 Node. The input signals from four independent
amplifier module output ports and possibly the auxiliary reverse injection amplifier
module port enter the reverse configuration module where they are combined
and/or directed to one to four optical transmitters. Reverse path segmentation and
or redundancy as well the ability to locally inject signals into the reverse path of the
amplifier is set by plugging the appropriate reverse configuration module into the
RF amplifier module. The reverse configuration module is a plug-in, field accessible
module. See Reverse Configuration Module (on page 41) for more information.
amplifier module and GS7000 Node. The input signals from four independent
amplifier module output ports and possibly the auxiliary reverse injection amplifier
module port enter the reverse configuration module where they are combined
and/or directed to one to four optical transmitters. Reverse path segmentation and
or redundancy as well the ability to locally inject signals into the reverse path of the
amplifier is set by plugging the appropriate reverse configuration module into the
RF amplifier module. The reverse configuration module is a plug-in, field accessible
module. See Reverse Configuration Module (on page 41) for more information.
Reverse Auxiliary Jumper/Amplifier/Termination Module
The reverse auxiliary jumper/amplifier/termination module determines how
reverse band signals, locally injected into the RF amplifier modules auxiliary ports,
are routed within the amplifier module. The reverse auxiliary jumper module directs
signals for one of the RF amplifiers auxiliary ports to the reverse configuration
module.
The reverse auxiliary amplifier module amplifies signals for one or both of the RF
amplifiers auxiliary ports and directs them to the reverse configuration module. The
reverse auxiliary termination module terminates both auxiliary port reverse injection
signal paths in 75 ohms as well as the path to the reverse configuration module.
reverse band signals, locally injected into the RF amplifier modules auxiliary ports,
are routed within the amplifier module. The reverse auxiliary jumper module directs
signals for one of the RF amplifiers auxiliary ports to the reverse configuration
module.
The reverse auxiliary amplifier module amplifies signals for one or both of the RF
amplifiers auxiliary ports and directs them to the reverse configuration module. The
reverse auxiliary termination module terminates both auxiliary port reverse injection
signal paths in 75 ohms as well as the path to the reverse configuration module.