Cisco GS7000 Installation And Configuration Manual page 21

Model GS7000 Hub/Node Description
The Model GS7000 Node can be upgraded to a Model GS7000 Hub Node in the field.
This is accomplished by installing EDFA modules, optical switching modules, and
the SM/LCM in the node lid. The Model GS7000 Hub Node can then serve as a
traditional node feeding the local HFC plant and as an optical hub with the optical
amplifiers. The hub node with the amplifiers can service up to 32 nodes at a distance
of 50 km with only three fibers.
EDFAs are available in 17 dBm, 20 dBm, and 22 dBm for broadcasting. A 17 dBm or
21 dBm gain flattened constant gain EDFA version is available to fit any architecture
for requirements like DWDM narrowcasting.
The optical switch module is used for switching the input of an EDFA module from
a primary signal to a backup or secondary signal. The switch is monitored and
controlled by the SM/LCM in the node.
A specific model of the SM/LCM is required for use in the hub node. This SM/LCM
model monitors and controls several EDFA and optical switch parameters and
functions while continuing to monitor the standard node components.
Optical Hub
The Model GS7000 Hub Node can migrate to a full optical hub by replacing the RF
amplifier section with an optical passive device tray that can accommodate various
optical passive devices. The optical passive device tray has the capacity of housing
four 1x8 narrowcast/broadcast overlay combiners with integrated multiplexers and
demultiplexers. A four-band mux/demux, a 1x4 splitter, and a 1x2 splitter are also
available. These modular passive devices provide effortless installation and
removal, simple troubleshooting, and the capability to use off-the-shelf fiber jumpers
to interconnect active and passive modules. A fully deployed Model GS7000 Optical
Hub can be used to combine narrowcast/ broadcast up to 64 wavelengths feeding 32
nodes.
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