Reverse Path - Cisco GS7000 Installation And Operation Manual

Reverse Path

Introduction
Reverse path refers to signals received by the node from the cable distribution
network. These signals are amplified in the node and returned to the headend
optically through the fiber portion of the network. The reverse path is not used in all
networks.
Reverse Path Signal Routing
1.2 GHz SHO GS7000 Node reverse path signal routing functions are described
below.
Stage
1
2
3
4
5
Description
Reverse path RF signals are applied to node output ports
The RF signals from ports 1 and 2 are combined as well as the signals from ports
4 and 5. Each set of combined ports are amplified independently in the RF
amplifier module. Segmentation of these reverse signals is determined by the
switch located on the launch amplifier module.
Each of the reverse amplification paths in the RF amplifier module also contains
padding, trimming, filtering, -6 db wink, and RF On/Off switch circuitry.
The pairs (ports 1 & 2, ports 4 and 5) of reverse path signals are combined or
maintained separate, depending on the position of the reverse segmentation
switch, and directed to the transmitter module path(s) on the OIB.
The RF signals travel across the OIB to the transmitter(s) and or Remote-PHY
Device. The transmitter(s) and/or Remote-PHY Device convert the RF signals to
optical signals which are transmitted through the fiber portion of the network
back to the hub or headend.
Reverse Path
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