Consumer bandwidth demand continues to grow at a rapid rate every year. As a result, cable operators with devices based on DOCSIS® need to prepare their networks for the future. They need to plan for reduced service group sizes and ultimately for double or quadruple (or greater) bandwidth speeds. The Cisco® GS7000 1218-MHz 4-Way Segmentable Node enables them to implement these plans. This platform allows independent segmentation and redundancy for both forward and reverse paths in a reliable, easily configurable, technician-friendly package (Figure 1).
The forward path of the GS7000 1218-MHz node launch amplifier has additional gain to drop-into existing 870- and 1000-MHz networks. It can be initially deployed in nonsegmented mode with a single broadcast optical receiver distributing common RF services to either four output ports (all high level) or six output ports (two high level and four lower level). The forward path can also be fully segmented by using four independent optical receivers, with each feeding its own output port, or it can be left and right segmented by using two independent optical receivers, with each feeding half the node’s output ports. Forward-path optical redundancy is also supported through the use of optional redundant optical receivers. The type of forward-path segmentation or redundancy is determined by the type of Cisco GS7000 forward configuration module installed.
The GS7000 node’s reverse path is equally flexible. Reverse traffic can be segmented or combined and routed to a maximum of four distributed feedback (DFB) or coarse wavelength-division multiplexing (CWDM) reverse optical transmitters, or to the Cisco GS7000 Enhanced Digital Reverse (EDR) Transmitters as part of the EDR system. Reverse-path optical redundancy is supported through the use of optional redundant optical transmitters. The type of reverse-path segmentation or redundancy is determined by the type of GS7000 reverse configuration module installed.
- Six-port 1.2-GHz RF platform
- Gallium nitride (GaN) gain stages
- Easy forward and reverse RF split changes
- Field-accessible plug-in forward interstage linear equalizers, forward and reverse configuration modules, and signal directors
- 1218-MHz accessories in the Cisco GainMaker® style
- Onboard three-state reverse switch (on, off, and 6 dB) allows each reverse input to be isolated for noise and ingress troubleshooting (status monitoring or local control module required)
- Positions for up to four optical receivers and four optical transmitters in housing lid
- Optional low-cost local control module that can be installed with a redundant forward configuration module to allow optical path redundancy when no status monitor is required
- Optional status monitoring using a DOCSIS transponder (using standard SCTE-HMS MIBs)
- Fiber entry ports on both ends of housing lid
- Fiber management tray and track for easy access to fiber connections
- Primary and redundant power supplies with passive load sharing
- Spring-loaded seizure assemblies to allow coaxial connectors to be installed or removed without removing amplifier chassis
- Dual or split AC power