Spectrum Capture; Power Distribution; Rf Amplifier Module - Cisco GS7000 Installation And Operation Manual

Spectrum Capture

Spectrum Capture

A built-in spectrum analyzer is used to monitor these RF signals: four reverse inputs, four forward outputs
and two RPD inputs. Users can monitor each individual signal via the LCS app.

Power Distribution

The node is powered by one or two power supplies.
Node power distribution functions are described below.
Stage
1
2
3
4
5

RF Amplifier Module

This section describes the RF amplifier module. The RF amplifier module contains the intelligent forward
amplifier module (IFAM) and intelligent reverse amplifier module (IRAM).
The IFAM provides all forward signal amplification outside the iRPD in the node. It contains four forward
amplification paths. The forward amplification paths have one common input, and each of the forward paths
functions the same.
The IRAM provides all reverse signal amplification outside the iRPD in the node. It has four independent
signal inputs (from ports 1, 2, 4, and 5). The reverse signals from ports 1 and 2 (left side) are combined as
well as the reverse signals from ports 4 and 5 (right side). These (left and right side) reverse path signals then
travel through the on board reverse configuration circuitry. This reverse configuration circuitry determines
whether the (left and right side) signal paths remain segmented or if they are combined.
There are no physical test points on RF amplifier module, forward and reverse path. Built-in spectrum capture
circuitry is used to monitor the forward and reverse paths.
To save power, the user can independently turn off any of the forward path gain blocks. The node can also
automatically adjust power consumption based on the channel plan. Note that this feature is disabled by default
and the user needs to use LCS to enable it.
Cisco GS7000 Super High Output Intelligent Node Installation and Operation Guide
10
Description
45 to 90 V AC is applied to one or two power supply modules in the node.
The power supply module(s) convert(s) the AC input to +24.5, +8.5, -6.0, and +5.5 V DC.
The +24.5, +8.5, -6.0, and +5.5 V DC lines are routed to node internal modules.
If two power supplies are installed and both are active, the load is shared equally between them.
An AC segmentable shunt is available to separate the AC connection to ports 1-3 from that of
ports 4-6. This allows the node to be configured where one power supply is powered from ports
1-3 and a second power supply is powered from ports 4-6.
Theory of Operation