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SG4000 Installation and Operation Manual

Section 2

Overview

This section provides an overview of the multiple receiver and transmitter combinations

available to satisfy a variety of architectures.

The forward path uses Motorola Proprietary Enhanced Gallium Arsenide (E-GaAs) technology

to deliver broadcast video and data over the entire 47 MHz-1 GHz passband. With provisions for

up to nine optics modules, the SG4000 scales from its most basic version to full 4x4 capability

without any loss of initial investment and with minimal service interruptions.

The base SG4000 forward path configuration receives broadcast video and data and splits the

content into four RF outputs. As an option, you can add a second receiver to provide module

redundancy. The node can be divided in half, with one receiver providing signals to the right

half while a second receiver, with unique content, drives the left half. You can add two

additional receivers to provide module redundancy for each half. Finally, you can use four

receivers in conjunction with dedicated RF modules to provide 4X segmentation.

The base SG4000 return path configuration combines all four RF returns using a return

combined redundant board and drives a single analog 1310 or 1550 nm transmitter. You can

add an additional transmitter to provide return path module redundancy. You can also use a

return split redundant board with two transmitters to split the node in half, or you can use four

transmitters to add module redundancy to the split return. As a final option, you can use two

return segment configuration boards to provide complete return path segmentation.

The SG4000 power system uses N+1 redundant power supplies that provide forced load sharing.

A single SG4-PS power supply supports the base configuration of four SG4-RF modules, one

receiver, one transmitter, embedded plug-in module (EPIM), and a status monitor transponder.

You can add a second power supply to provide redundancy for the base configuration. As

additional optics modules are added for redundancy or segmentation, a second power supply is

required to support the increased payload. You can add a third SG4-PS to provide power supply

redundancy in configurations requiring two supplies.

The SG4000 power system load sharing design does not support independent AC

powering with two sources.

To accommodate unique system criteria, the SG4000 is shipped as a configured product. Options

available include:

 Low, standard, and high tilts

 Band splits S, J, A, K, and E

 SC/APC or E2000 optical connectors

 HMS transponder

 Ingress switches

 Redundant powering

As a platform for Motorola’s high-speed Time Domain Multiplexed (TDM) digital return, the

SG4000 effectively combines node segmentation with wavelength aggregation, conserving fiber

resources. Digital return transmitters are sold separately.

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