Table of Contents
Advertisement
Chapter 1
Product Overview
How the KRF Operates on
Broadband
1 2
A broadband communication system is an alternative way to connect
communication equipment. Numerous separate networks share a single
coaxial cable, eliminating separate wires for each network. Broadband
cable systems use the same type of cable used in Community Access
Television (CATV), which can cover large distances using standard CATV
devices. Its high level of noise immunity is well suited to the industrial
environment, since communication takes place at RF frequencies well
above motor noise, arc welder noise, and AC noise.
Imagine the broadband cable system as a tree-like structure that has
several trunks and various branches with taps. When the system is
expanded, new devices are tapped in to the branches. Further expansions
can be made by adding branches.
Just as CATV provides users with multiple channels on one cable,
broadband systems provide multiple data channels using RF technology to
divide the bandwidth of the cable into separate frequency bands. In data
systems, the frequency space that one CATV channel occupies is often
divided into many subchannels that offer separate services. Data
communication on CATV systems use channel pairs for two-way
communication. Each separate network occupies its own pair of channels
or subchannels. A message from a device on the cable is transmitted on
an inbound channel to a central location called the headend. Here, a
translator device transfers the message to an outbound channel that
broadcasts it to all devices that receive the channel. In this way, a data
channel replaces a daisy-chained twisted pair cable connection.
expansion
tap
branch
trunk
Advertisement
Table of Contents
