A || B || C || D || E || F || G || H || I || J
|| K || L || M || N || O || P || Q || R || S || T || U || V || W || X || Y || Z
Accelerated Life Unique to Motorola, ALT is a proprietary Testing (ALT) process developed to simulate five years of field stress in several weeks. Motorola pagers are subject to this test in design, at pre-production, and during their product life cycle.
AF See Audio frequency.
AGC See Automatic gain control.
Alphanumeric A character set containing letters, digits, and other symbols such as punctuation marks.
Ambient Temperature in the area surrounding an temperatureobject.
Amplification Process of increasing the strength of a signal, current, voltage or power.
Amplifier Used to boost sound in analog systems.
Amplitude Magnitude or size. In waveforms (signals) occurring in data transmission, the voltage level is called the amplitude.
Analog Refers to a type of measurement in which the "line of measure" is continuous as compared to one which is discretely incremented. For example, a clock with hands is an analog device (as compared to a digital clock which is not). With the analog clock, time is measured smoothly with an infinite number of increments. A digital clock displays time only in the increments of its greatest resolution, usually seconds. You would be able to see the time 12:01:01.5 on an analog clock; the digital clock would show the time as either 12:01:01 or 12:01:02 but nothing in between.
Analog Transmission transmission of a continuously variable signal as compared to a discrete (digital) one.
Antenna Device which radiates and/or receives radio signals.
Antenna (Omni-directional) Antenna that radiates equal power in all directions in a horizontal plane.
Antenna(Uni-directional) Antenna that radiates most of its power in one direction.
Antenna gain Increase in power radiated by and/or received by an antenna in a given direction compared to the power radiated (or received) in the same direction by a "standard" antenna.
Attenuation Reduction in strength of an electrical signal.
Audio frequency Usually refers to that range of tones (frequencies) which the human ear can hear. Generally accepted as the range between 20 and 20,000 Hz (Hertz).
Automatic gain A circuit feature which maintains a control constant level of output signal automatically by varying the amount of amplification applied to an input signal of varying level.
Automatic retry Trunking term referring to the system's ability to "re-enter" or "redial" for the user in situations where the channel was originally busy or the user was in a fade area.
Bandwidth Portion of the frequency spectrum required to transmit desired information. Each
radio channel has a centre frequency and additional frequencies above and below this carrier frequency
which are used to carry the transmitted information. The range of frequencies from the lowest
to the highest used is called the
bandwidth.
Baseband Transmission of a digital or analog signal
signalling at its original frequencies. The signal is
in its original form, not changed by modulation.
Base station Transmitter/receiver unit situated in a fixed location which can talk directly to other radio
units.
Battery One or more electrochemical storage cells connected together to serve as a source of DC power.
Battery saver Circuit used in some radios to extend the life of a charged battery.
Baud Unit of signalling speed in telegraphic code; also the number of bits per second that can be
transmitted/received in a given computer system.
Bi-directional In two, usually opposite, directions. Frequently refers to the coverage pattern of a radio
antenna which is most predominantly in two directions.
Binary Refers to the base-two number system. The system contains only two numbers, 0 and 1. In
computer-like circuits, the presence of a voltage, current or other such signal indicates a "1" whereas the
absence of the same signal indicates "0".
Bit Contraction of binary digit. It is the smallest unit of information in a binary system.
Bits per second (bps) Rate at which bits of information are
transmitted.
Broadcast 1. Delivery of a transmission to two or more stations at the same time, such as over a bus-type local network or by satellite.
Broadcast band Radio frequency range between 550 KHz and 1600 KHz in which all commercial AM
broadcasting stations are assigned.
Capacity Average amount of traffic that a circuit or circuit group can handle.
Carrier Continuous frequency capable of being modulated, or impressed with a second (information
carrying) signal.
Carrier frequency Radio wave, current, or voltage used for transmitting intelligence, usually the
frequency of a radio channel.
Carrier squelch Feature that responds to the presence of an RF carrier by opening or unmuting (turning
on) a receiver's audio circuit. A squelch circuit silences the radio when no signal is being
received so that the user does not have to listen to "noise".
Cellular Type of mobile telephone service in which mobile telephone the geographic serving area is
divided service into sub-regions (cells), each with its own antenna and switching node.
Cellular system Method of mobile telephone service which divides radio communication service areas
into small "cells" or districts. The cellular approach utilizes low-power transmitters which allow
uninterrupted communications through sophisticated switching equipment linking the cells. This system,
by reusing frequencies and standardizing service and equipment, will substantially improve
mobile telephone service.
Central control Unit which assigns a control channel and executes, transmits and receives logic
programmes in a trunked radio system. The "brains" of a trunked system.
Channel Narrow band of frequencies (including the assigned carrier frequency) within which a
radio system must operate in order to prevent interference with stations on adjacent channels.
Channel element Frequency-determining device for certain types of older radio equipment. Some
transmitters and receivers use a quartz crystal to establish and maintain their opening frequency. Since a
crystal's frequency is affected by changes in temperature, the channel element employs an electrical circuit
which compensates for the changes.
Chip Small piece of specially prepared silicon material on which electronic circuits are etched to make
an integrated circuit device.
Circuit Path through which electrical signals flow.
Conductor Solid, liquid or gas which offers little opposition to the continuous flow of electricity.
Console Desk-like "cabinet" that houses equipment and controls for a communications centre or station.
Conventional Non-trunked radio system.
(radio system)
Conversion In receivers, the lowering in frequency
(as a single/dual (converting) of a received signal so that
conversion, etc) the contained intelligence can be more easily recovered. By example, in a dual
conversion receiver, the received signal will first be converted to a high I.F. (intermediate frequency) of
say 10.7 MHz. After simplification, a second conversion to 455 KHz (the low I.F.) takes place and from
this signal the audio is recovered.
Coverage Expression of statistical probability relating to a customer's useable radio area and time.
Unless otherwise defined, coverage is usually understood to permit communication within 90 percent of an
area, 90 percent of the time.
Crystal Thin slab of natural or man-made quartz which, when subjected to the proper
electrical excitation, will vibrate or oscillate at a specific frequency. Crystals can be used to control the
operating frequency (as well as other functions) of a radio transmitter or receiver.
Current Movement or flow of electrons through
a conductor. Electrical current is measured in amperes (amps).
Cycle One complete reversal of an alternating current consisting of a rise to a maximum level in one
direction, the return to zero, a rise to a maximum value in the other direction and a return to zero. The
number of cycles occurring in one second is the frequency of the current. The word "Hertz" is used to
signify one cycle per second.
DB See Decibel.
DC control Type of remote control using DC signals for control of a radio system.
DC-coupled Type of electronic circuit which passes a direct current signal.
Decibel Unit of relative voltage, power or sound equal to one tenth of a bel. The key term in this
definition is relative; the decibel is used to describe the difference in two values of voltage, power, etc.
When relating sound, the decibel is roughly the smallest change in level which the human ear can detect.
Decoder Device that "receives" and translates coded intelligence into a usable form.
Decryption Process of "unscrambling" an encrypted or coded message.
Degradation Refers to the lessening of signal clarity.
Delay Time difference between initiation and response.
Demodulation Process of extracting the intelligence (message) from a modulated carrier signal.
Detector Stage or circuit in a receiver that demodulates the carrier signal (RF) into its audio form.
Digital Data (information) in the form of pulses.
Digital signal Transmission signal that carries information in a discontinuous stream of on/off pulses.
Dipole antenna Straight ungrounded antenna which is separated in the centre by an insulator and uses a
conductor one-half wavelength long at a specified frequency.
Directional Any antenna which picks up or radiates
antenna signals better in one direction than another.
Disable To make inoperative or to stop.
Discreet alert When pagers are in the silent position, they will receive pages but will emit only a short
beep (or chirp).
Display Refers to the visual manner in which a message is depicted.
Distortion Unfaithful reproduction of audio signals due to changes occurring in the waveform of the
original signal somewhere in the course of its transmission, reception, or amplification.
DTMF See Dual tone multi-frequency.
Dual tone multi-frequency Tone-based signalling scheme which
combines two of a set of standard
frequencies. The result of the combination is a third or "beat" frequency (signal)
which is the desired or useable signal. DTMF signalling is used as "tone- dialling" in the
common telephone.
Duty cycle Battery usage rating system for radio
equipment which specifies the amount
of transmit, receive and idle time for a
specified use period. For example, "5-5-
90 = 8 hours" means that if the radio
transmits 5% of the time, receives 5% of the time, and is idle 90% of the time,
then the battery will last 8 hours.
Electronic mail Communication service that permits the
electronic transmission and storage of
text messages.
Encoder Converter or transducer used to create a
specific addressed message.
Escalert alert tone Motorola term for a series of interrupted beeps which increase in
volume until the pager is reset. This allows the pager
to be used in a variety of noise
environments.
Falsing Extraneous signal or signals that cause a decoding device to operate without the
normal input of proper encoding signals.
FCC See Federal Communications
Commission.
Federal Communication Commissions (FCC) Board of Commissioners appointed by the President which has the power
to regulate domestic communications
systems other than those owned and
operated by the federal government
itself.
Feedback The transfer of a portion of energy from one point in an electrical system to
a
preceding point. The transfer may be
either electrical or acoustical.
Field Product feature enabling radio reprogrammable reprogramming of frequencies and
features at a service shop rather than at the factory.
Filter Equipment that permits the transmission
of certain frequencies while excluding
others.
5/6-tone Paging code format utilizing 12 tones
transmitted 5 or 6 at a time sequentially. If 6 tones are used, it indicates dual
address operation.
FLEXTM High speed paging code format
developed by Motorola that can move
data at 6400 bps.
FM See Frequency modulation.
FM transmitter Radio transmitter that emits or radiates a
frequency modulated signal.
Frequency Number of complete cycles per second
of an alternating current signal, usually
measured in hertz.
Frequency Method of modulating (adding modulation intelligence to) a transmitter's base or
carrier frequency by causing the frequency to vary above and below the carrier
frequency proportional to the inputted
intelligence.
Frequency shift keying Modulation method which imparts
intelligence to a radio carrier by slightly changing the frequency of the
carrier above and below the channel frequency.
FSK See Frequency shift keying.
Gain antenna Antenna designed to increase its normal field range through a more
directional profile. The increase is measured in decibels.
Gateway Important characteristics of a LAN that allows it to interface with different
transmission networks, particularly the public switched telephone network. The
interface mechanism provides special data translation and conditioning functions
for transmission compatibility between the networks.
GHz See Gigahertz.
Gigahertz Unit of measurement of a frequency equal to one billion times per second.
Frequencies in this range are usually considered to be the microwave type.
Golay High capacity binary paging code format also known as GSC (Golay Sequential
Code); named after its inventor due to its
superior fade resistance and error
correcting capabilities.
Ground Connection (intentional or accidental) between an electrical circuit and the earth
or its electrical equivalent.
Ground wave Radio wave that is propagated near or at the surface of the earth.
Group call Feature found in some paging systems which permits alerting of all units
in a given group simultaneously. When used in combination with
individual paging, the
pager must be capable of responding to two different codes.
Harmonics Radio signals which are generated along
with a desired signal. Harmonics are usually undesirable and must be eliminated
or suppressed to a level which will not cause interference-type problems.
Hertz The unit of frequency measurement. Previously called "cycles per second".
High band Portion of the frequency spectrum from 132-174 MHz.
Hz See Hertz.
IF See Intermediate frequency.
Insulation Any non-conductive material used to prevent the leakage of electricity
from a conductor, such as plastic, rubber or glass.
Integrated circuit Semiconductor device which may contain the equivalent of hundreds
or thousands of transistors, diodes, resistors, and capacitors on a tiny "chip"
silicon.
Interconnect Operational scheme or piece of electronic equipment which permits messages
to be transferred between radio and telephone systems.
Interface Method or piece of equipment for interconnecting units or systems which
may not be directly compatible.
Interference Effects that occur when undesired signals inhibit or degrade the reception
of a desired signal.
Intermediate A range of frequencies which falls frequency between audio and radio
frequencies.
Intermodulation Mixing of two radio signals to produce a third signal which interferes with
the reception of a desired signal. Sometimes called "intermod".
Inverter Device which changes direct current to alternating current.
KHz See Kilohertz.
Kilohertz Measure of frequency. One kilohertz is equal to one thousand hertz (cycles
per
second).
Kilowatt One thousand watts.
KW See Kilowatt.
LCD See Liquid crystal display.
LED See Light emitting diode.
Light emitting A semiconductor indicator light.
diode
Line Transmission wire within a telephone system; part of a local loop that connects
a subscriber to the central office.
Line drop Voltage drop between two points on a power or transmission
line, caused by the resistance of or leakage from the line.
Line-of-sight Straight line distance between two distance points; often refers to the distance from an
antenna to the horizon.
Liquid crystal A type of information output or display display device used for watches,
calculators, meters and similar devices.
Low band Portion of the frequency spectrum from
25-54 Mhz.
Megahertz Unit of frequency measurement equal to one million cycles per second.
Mem-o-lert (deferred paging) Feature enabling a pager to receive and store a page
without sounding an alert; at a later time, depressing a switch on the pager retrieves
the stored messages.
Message protection In certain Motorola pagers, important messages can be stored in
memory until you turn off the pager. New messages will not overwrite
protected messages.
MHz See Megahertz.
Microphone Device which converts sound waves into corresponding audio frequency
electrical energy.
Microprocessor Solid state integrated circuit device which performs many high speed (digital)
functions. The heart of computer-type
circuits.
Microwave Portion of the frequency spectrum above one gigahertz (1,000 MHz).
Microwave radio Radio frequency used extensively for long-distance telephone
transmission. Digitally-encoded messages are sent through microwave
channels either between terrestrial antennae, via satellite, or through wave guides.
Mid-band Part of the frequency spectrum from 72-76MHz.
Modem Interface device usually connected between a computer and telephone lines
or a radio system.
Modulate Vary the amplitude, frequency or phase of a radio signal in order to
transmit intelligence.
Modulation Impressment of information on a carrier signal by varying one or more of
the
signal's basic characteristics — frequency,
amplitude and phase. Different
modulation carries the information as
the change from the immediately
preceding state rather than the
absolute state.
Multiplex Method of imposing one or more subcarrier channels on the base frequency of a
transmitter. Common in point-to-point microwave systems.
Nationwide paging Method of national or regional paging in
which a single frequency is used throughout the nation (region) for sending messages
to a paging system subscriber.
Network 1.Series of points connected by communications channels.
Networking Method of national or regional paging in which paging messages are sent via a communications network to various regions and transmitted, usually at different frequencies, in different areas.
Node Point in an electrical or electronic circuit which is the junction of two or more components.
Noise compensated Squelch system that responds to the squelch presence of an RF (radio
frequency) carrier. Such a system usually permits adjustment of the squelch
to allow only signals of a certain strength to be heard.
Non-volatileType of solid state "memory" device memory which retains its electrical data after power is removed from the circuit.
Numeric display Use of numbers to display channel selected.
Omni-directional Antenna that radiates or receives signals equally well from all
directions.
Operator Person who assists in placing telephone calls.
Out-of-range Optional feature of a pager that tells option the user that he/she is out of range of the
message receiving capability of the unit.
Paging One-way communication concept in which an intended receiver is alerted to receive
a message.
Paging format Paging format is similar to a computer language. Different pager
manufacturers have designed their pagers to work with specialized formats or
codes and carriers must use a paging terminal equipped with these codes.
PBX Abbreviation for private branch exchange.
Private telephone switching system
located on a customer's premises. Both PBX and hybrid PBX systems provide
pooled access to a group of access lines typically by dialling "9" from an internal
station set.
POCSAG Binary paging code format named after
the committee which conceived it – the
(British) Post Office Code Standardisation Advisory Group. Available in Motorola
pager models.
Point-to-point Describing a circuit that connects two
points directly, where there are generally no intermediate processing nodes or
computers, although there could be
switching facilities. A type of connection,
such as a phone line circuit, that links two
and only two logical entities.
Power Electrical measure of the strength of a
transmitter's signal. Power is measured
in watts.
Power amplifier Electronic unit operating in the audio or
radio frequency bands which is designed
to increase and deliver an increased
amount of output energy (power).
Sometimes the unit is referred to by its
abbreviation, PA.
Power-up alert Feature of a radio receiver that permits
tones the user to hear the start-up of the device.
Priority paging Pager "address" which has been
designated as a "priority address". This
designation overrides the unit's silent
mode of operation.
Propagation Radiation of electromagnetic waves.
Protocol Rules of order by which a communication network is operated. Also the rules
by
which a specific data communications
function must proceed.
PSTN See Public switched telephone network.
Public switched telephone network Domestic telecommunication network
commonly accessed by ordinary
telephones, key telephone systems, PBX trunks, and data arrangements.
Radio Telecommunications by means of radio
communication waves.
Radio frequency That part of the general electromagnetic spectrum between the audio and
infra-
red light regions (about 10KHz to
10,000,000 MHz).
Radio receiver Unit which amplifies radio frequency
signals, separates the audio signal from the RF
carrier, amplifies it, and
converts it back to the original sound
waves (voice heard through the
speaker).
Radio spectrum Entire range of useful radio waves as
classified into seven bands by the Federal
Communications Commission.
Radio wave Combination of electric and magnetic
fields varying at a radio frequency rate
and capable of travelling through space
at the speed of light. It is produced by
feeding the output of a radio transmitter into a
transmitting antenna.
Range Extent of coverage or effectiveness of
a transmitter or radio system. A measure of
distance, usually in miles.
Read-only memory A semiconductor device capable of
storing data which can only be read, not changed.
Receiver Device on the transmission line that
converts a signal to whatever type of
signal is needed to complete the
transmission.
Reminder chirp Optional feature of a pager that emits a
"chirp" every two minutes when there
are unread messages.
Remote control Control of a radio system where all
functions are performed at more than
100 feet from the base or control station. Control
may be by DC or tone signals.
Remote Ability for the carrier to programme a programming pager into the paging
terminal when
away from the terminal location.
Repeater Type of radio station that automatically
re-broadcasts radio signals that it
receives. Repeaters are used to extend the
effective range of communications.
RF See Radio frequency.
ROM See Read-only memory.
RS-232C Standard which describes a type of
electronic interface between two
devices. Sometimes referred to as a
"serial" interface.
Satellite Orbiting system in space that receives
communications radio signals from ground bases on earth and then re-
transmits them to distant
locations.
Scan Optional feature of a receiver that
enables the unit to continuously check
multiple channels for messages. Once
it locks into a message being transmitted,
it continues to look for another channel
that is actively transmitting.
Selectivity Characteristic of responding to a desired
frequency to a greater degree than to
other frequencies.
Semiconductor Crystalline material which displays
properties of both a conductor and an
insulator. Used to make transistors,
diodes, and integrated circuits.
Sensitivity Characteristic of a radio receiver which
determines the minimum input signal
strength required for a given signal
output. In FM, sensitivity is usually
measured in microvolts (µV).
Signal Form of a radio wave in relation to the
frequency serving to convey intelligence in
communication.
Silent alert Non-audible signal in a beeper. Usually
a vibrating motor that causes the pager
to "shake" silently to alert you. An option on many
tone alert and digital display
pagers. Perfect for use in private
meetings where you do not wish pages
to disturb the meeting, or in high ambient
noise environments. Can also be a visual blinking
light indicator.
Simulcasting Relates to simultaneous transmission
of a paging signal from all the transmitters in a
system to achieve wide-area
coverage. Normally, without special
simulcast engineering, such multiple
transmissions would garble all the
overlapping signals.
Spectrum Range of frequencies within which
electromagnetic radiation has some
specified characteristic, such as the
audio-frequency spectrum, radio
spectrum, ultraviolet spectrum, etc.
Squelch Electronic circuit which causes the audio output stages of a
receiver to be turned
off when a desired radio signal is not
present.
Static Noise heard in a receiver due to changes
in electrical charges in the atmosphere
caused by lightning or man-made causes such as
engine ignition, electric motors, neon lights, etc.
Subscriber Person(s) subscribing to a pager or mobile
telephone service.
Switch Piece of equipment that establishes and routes
communication paths between
separate extensions.
Synthesizer Type of electronic circuit which generates signals;
a replacement for a crystal
oscillator circuit. The synthesizer is usually
a programmable semiconductor device
(integrated circuit) which permits control of the
frequency of the output signal.
Synthesizers are used in musical
instruments, radio transmitters/receivers, test
equipment (signal generators), etc.
Telecommunications Communication process that allows the
transmission of information from a
sender to a receiver by means of an
electromagnetic or light wave medium.
Telephone Piece of equipment used for the general
transmission of voice communications.
Telephony System of speech telecommunications.
Telocator alphanumeric paging protocol Similar to TNPP; supports interoperability across different alphanumeric paging terminal manufacturers.
Telocator network Signalling protocol developed and
paging protocol supported by Telocator Network of
America that supports interconnection of
terminals from different manufacturers
into wide-area paging systems.
Terminal Computer-controlled switching system
network and controls the base stations
used to signal pagers and mobile
telephones. The software in the terminal dictates
some of the capabilities of the
pager or mobile telephone.
TNPP See Telocator network paging protocol.
Tone Type of telephone dialling that sends to
the central office unique acoustic sound for each
number pressed on the dial pad.
Touch-tone AT&T's registered trademark for push-
button (DTMF) dialling.
Transceiver Terminal that transmits and receives
traffic.
Transmission Sending and receiving of telecommuni-
cations message through appropriate
channels.
Transmission line Set of conductors used to transfer signal energy
from one location to another. A
common application is the coaxial cable
used to connect a station to an antenna.
Transmission loss Term used to denote a decrease in power during
the transmission of energy from
one point to another.
Transmitter Unit used for generating and amplifying
an RF carrier signal, modulating the carrier signal
with intelligence and then the
modulated signal into space.
Trunk Multi-user one-way or two-way wireline
used between communication switching
equipment.
2-tone One of the early paging code formats
utilizing two distinct tones transmitted in
sequence.
Two-way Communications that occur between
communications radio stations, each having a transmitter and receiver.
The stations may be in
fixed locations, mobile or portable, in any
combination.
Uni-directional Antenna designed to radiate with
antenna maximum strength or receive with
maximum sensitivity in one direction and with
minimum radiation or reception in
the opposite direction.
User Individual operating a piece of equipment.
VHF Portion of the radio spectrum extending from
136 to 160 MHz (often called High band).
Visual alert Term used to describe a pager that signals with a
blinking light.
Voice mail Sophisticated telephone voice messages that are
recorded and translated into
digital bits for storage and manipulation. Voice
mail systems use specialized
hardware and software and can be
incorporated into a PBX or used as stand- alone
systems.
Voice paging One-way communication of a message
utilizing voice transmissions.
Voice retrieval Message system which stores verbal
messages (from callers or operator) for
automatic retrieval at customer's
convenience. Can be used in conjunction with a
paging terminal to alert customers of waiting messages.
Voice storage System designed to store voice paging
messages on congested paging channels until the
terminal can transmit.
Volt Basic unit of electrical potential. One volt is the
force required to send one ampere of electrical current through a resistance
of one ohm.
Watt Basic unit of power. Equal to the voltage
(expressed in volts) multiplied by the current (expressed in amperes).
Waveform Graphical display of an electrical current as on an
oscilloscope or similar piece of test equipment.
Wavelength Distance travelled by a wave in the time of one cycle. Electromagnetic waves include both light and radio waves and travel in space at approximately 300,000,000 metres per second. To determine the exact length of a wave (in metres), the above number is divided by the frequency (in hertz).
Copyright 1995, 1996, Motorola, Inc. All Rights Reserved.
B
Band Range of radio frequencies between two defined limits which are used for a specified
purpose. For instance, in the business spectrum we refer to radios that operate in Low Band, High Band,
UHF, 800 and 900 MHz as "bands" of frequencies.
2. Protocol mechanism whereby group and universal addressing is supported.
C
Cable One or more insulated wires used to transmit an electrical current or signal.
D
Data Singular noun meaning information.
E
Electromagnetic spectrum Total range of frequencies of radiation
extending from the longest radio wave to the shortest known cosmic ray.
F
Facsimile Technology that allows a paper message to be scanned optically, translated
into
digitally encoded pixels, and sent across the public telephone network to
a receiving facsimile machine which
then reconstructs the original image.
G
Gain Increase in signal power denoted in dBs.
H
Handset Device similar to a telephone handset used in place of a hand microphone and
loudspeaker.
I
IC See Integrated circuit.
K
Keypad Device with a matrix of keys enabling a user to input (usually numeric) information
into another device, as in dialling a touch -tone telephone.
L
Land Mobile FCC term referring to land-based com- Service munication between base stations
and land-mobile stations or units.
M
Mail drop Option available in some of Motorola's pagers, which allows the pager to
keep track of up to four variable messages (for example stock quotes and
commodity prices) by assigning each its own address and specific slot in
memory. You are informed of the most current information in the special
mail drop location. You can check your messages at your leisure, since the
mail drop message is renewed periodically and silently.
N
National paging Paging service provided on a national or
regional basis, in which subscribers use a single pager which can operate in many
different areas. This is usually achieved with a single frequency available nationwide
(called nationwide paging) or through a form of networking which uses
a pager
that receives different frequencies in
different areas.
2.Switched telephone network is the network of telephone lines normally used for dialled telephone
calls.
3.Private network is a network of communications channels confined to the use of one customer.
O
Ohm The unit of measurement for resistance in a conductor.
P
Pager Pocket-sized radio receiver which
generates audible or physical signal
when user is paged.
Q
Queuing Orderly access to a system; generally,
"first in, first out" prioritization.
R
Radio common Licensed, independent radiopaging and
carrier mobile telephone company that provides FCC-authorized communications services
solely through the use of radio signals.
S
Satellite Remote device, such as a satellite
receiver.
T
TAPP See Telocator alphanumeric paging
protocol.
U
UHF Term used to designate radio system
operation in the 406-420 MHz, 450-470
MHz, and 470-512 MHz.
V
Vendor Seller of telecommunication services or
equipment.
W
Goto
Table of Contents ||
Chapter 1 ||
Chapter 2 ||
Chapter 3 ||
Chapter 4 ||
Chapter 5 ||
Chapter 6 ||
Chapter 7 ||
Appendix A ||
Appendix B ||
Appendix C
Last updated: June 5, 1996