User's Manual

Draft

RT 1000 v1.3 27 Deployment Guide R03.d

Backhaul

4.1 Overview

In network communications, the backhaul is the part of the network that

contains the links and equipment between the core network and the sub

networks.

Wireless mesh networking is a method where each radio node in the network

captures and disseminates its own data as well as serves as a relay for other

radio nodes in the network sending data along a path, hopping from one node

to the next.

Power over Ethernet (PoE) is a technology that passes electrical power along

an Ethernet cable. PoE is used where DC power is not available and USB

unsuitable. Power can be supplied at the end of a network span or somewhere

in the middle. PoE switches supply power at the end of a span. PoE injectors

supply power somewhere between the PoE switch and the powered device.

They inject power and do not affect the data.

The RT 1000 Central Recording System is a fully connected mesh network of

Wireless Remote Units (WRUs) that communicate in a routing pattern (bucket-

brigade or string-of-pearls) with a Line Tap Unit (LTU) on the 2.4 GHz

Industrial, Scientific, and Medical (ISM) radio band.

The LTU is composed of the following:

 Base Station Unit (BSU)

 Power over Ethernet (PoE)

 24 V Battery or Power Supply

 Cables

 Mast, mast base, and guy-wires

 5.8 GHz backhaul radios

 Antennas

The LTU communicates by way of the BSU with the Central Software System

(CSS) computer in the central recording truck along a backhaul on the 5.8 GHz

ISM radio band.

The Central Software System (CSS) communicates with the field units via the

backhaul radios. The backhaul radios act as access points for the BSUs.