Wireless
Communications Glossary & FAQ
Click on any term or question for
a description.
Asynchronous
Real time communications
Full duplex radio
Half-duplex radio
Simplex radio
Unconditioned digital output
Master station
Remote radio
FHSS (Frequency Hopping Spread Spectrum)
MODBUS
Repeater extension
Digital signal processing (DSP)
Automatic CRC/ARQ and forward error
correction
What is the advantage
of a licensed microwave radio?
What is the advantage of a license-free
wireless solution?
What are asynchronous protocols?
What is the benefit of transparent and
direct asynchronous communication?
Glossary
Asynchronous:
Not synchronized; that is, not occurring at predetermined
or regular intervals. The term asynchronous is
usually used to describe communications in which data
can be transmitted intermittently rather than in a steady
stream. For example, a telephone conversation is asynchronous
because both parties can talk whenever they like. If
the communication were synchronous, each party would
be required to wait a specified interval before speaking.
Real time
communications: Data is sent and received between
master and remote radios with virtually no delay - usually
less than 20-30 milliseconds (millisecond = 1/1000 of
a second) and as little as 8-10ms.
Full duplex
radio: Wireless data communications system or equipment
capable of transmission simultaneously in two directions.
Half-duplex
radio: Wireless data communications system or equipment
which permits transmission in both directions, but only
in one direction at a time.
Simplex
radio: Wireless data communications system or equipment
in which transmission occurs in one direction only.
Unconditioned
digital output: An output signal that is not conditioned
to specific parameters.
Master station:
A radio that communicates with several remote stations
for the purpose of gathering telemetry data.
Remote radio:
A radio that communicates with a master station
or repeater radio for the purpose of gathering telemetry
data.
FHSS (Frequency
Hopping Spread Spectrum): Frequency-hopping spread-spectrum
(FHSS) uses a narrowband carrier that changes frequency
in a pattern known to both transmitter and receiver.
Properly synchronized, the net effect is to maintain
a single logical channel. To an unintended receiver,
FHSS appears to be short-duration impulse noise.
MODBUS:
A protocol messaging structure developed by Modicon
in 1979, used to establish master-slave/client-server
communication between intelligent control devices.
Repeater
extension: All Remotes synchronize to a corresponding
Master. This can be the "real
master" (the MODE M unit), or it can be
a repeater "Extension" that derives synchronization
from the "real master".
Digital signal
processing (DSP): The study of signals in a digital
representation and the processing methods of these signals.
Automatic
CRC/ARQ and Forward error correction: Types of error
checking for transmitted data
Frequently Asked Questions (FAQ)
What's the
advantage of a licensed microwave radio (MDS Transceiver
Series)? A licensed radio provides a protected operating
frequency. The FCC regulates and issues licenses on
specific frequency for a specific geographical area.
What's the
advantage of a license-free wireless solution (TransNET
900)? A license-free solution eliminates costs or
testing prior to installation. It does not require FCC
frequency operation license and does not require an
up-front licensing study.
What are
asynchronous protocols? Data transmission that is
not related to the timing, or a specific frequency,
of a transmission facility; transmission characterized
by individual characters, or bytes, encapsulated with
start and stop bits, from which a receiver derives the
necessary timing for sampling bits; also, start/stop
transmission.
What is the
benefit of transparent and direct asynchronous communication
offering real time communication? The radios do
not alter or adversely delay data providing very fast
turn around times and updates for polling of data points.
Wireless Communications
Products | Product
Demonstration
Wireless Communications
Case Studies | Resources
|
