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AIM Inc WP-98/001R2
Radio Frequency Identification
RFID
A Glossary
Document Type: AIM Inc. White Paper Document Version: 1.2, 2001-08-23
AUTOMATIC IDENTIFICATION MANUFACTURERS -- AIM AIM (Automatic Identification Manufacturers), the trade association for the Automatic Identification and Data Collection (AIDC) industry, is the source for technically accurate, unbiased, commercial-free, and up-to-date information on all AIDC technologies including:
Bar Code including 2-D Symbologies Radio Frequency Identification Biometrics Radio Frequency Data Communications Machine Vision Smart Cards Magnetic Stripe Touch Memory Optical Character Recognition Voice Recognition Optical Cards
AIM was created to support and accelerate the growth of the market for AIDC products. The association serves over 1000 members world-wide through an extensive network of national and regional AIM affiliates. AIM's priorities are the development and support of international standards and the pursuit of common activities at the national and regional level.
Our member companies represent a wide array of AIDC technologies either as manufacturers or as providers of equipment, systems, and services. A listing of AIM's world-wide membership is contained in the AIM Inc. Yearbook and Buyers Guide, and on AIM's web site (http://www.aimglobal.org) in a searchable format. Many national affiliates also produce individual membership directories.
AIM Affiliates and Staff AIM has some 14 licensed national and regional affiliates around the world. All AIM affiliates subscribe to consistent objectives as described above. Each body acts as a gathering point for company representatives to collaborate in an effort to increase the size of their local or regional market. This is supported by independent staff which often represents the membership to outside groups, such as industry specific standards committees.
Affiliate organisations include: AIM ARGENTINA AIM BELGIUM AIM BRAZIL AIM DENMARK AIM FINLAND AIM GERMANY AIM ITALY
AIM JAPAN AIM MEXICO AIM NETHERLANDS AIM NORWAY AIM RUSSIA AIM SWEDEN AIM UNITED KINGDOM
Published by: AIM, Inc. 634 Alpha Drive Pittsburgh, PA 15238
Phone: +1 412 963 8588 Fax: +1 412 963 8753 Internet email: [email protected] Web: http://www.aimglobal.org
Copyright © AIM Inc. 1998, 2001
All rights reserved. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher.
01/08 V1.2
Radio Frequency IDentification (RFID) Glossary Preamble Within our information dominated society the advances in technology are invariably accompanied by new terminology or jargon which, to the uninitiated, can be both bewildering and annoying, particularly where different terms have similar meanings and ambiguity invites uncertainty. The terminology, once refined and agreed, provides the necessary foundation language for communication on technological matters. Glossaries provide an appropriate vehicle for declaring these language foundations for which a consensus of agreement has been established.
Radio frequency identification (RFID) is an expanding, progressive area of automatic identification and data capture (AIDC) for which an internationally agreed glossary of terms may be considered both timely and of potential value to practitioners and users alike. RFID, like other automatic identification and data capture technologies such as bar coding, is concerned with storage and portability of data, and its subsequent retrieval and communication to a host data or information management system. RFID data carriers, generally referred to as transponders or tags, carry data that can be read or interrogated by radio frequency electromagnetic fields similar to those used in radio broadcast and communications. However, they operate within different parts of the electromagnetic spectrum at power levels very much lower than broadcast and mobile phone levels. Indeed they come into the category of low power radio systems.
From the viewpoint of data handling RFID systems share many of the features seen in other AIDC systems and can be summarised in the simplified data flow model illustrated below. The Glossary provides an assembly of terms that describe features and functions throughout the RFID data flow chain, together with features and functions concerning the components and structures that can be seen in RFID systems. Many of the terms are drawn from associated disciplines such as radio communications, information theory and coding. An attempt has been made to cross reference associated terms, where it has been seen possible to do so, and to distinguish terms that have similar or identical meanings. Thus, terms that have descriptions in their own right and are found elsewhere in other descriptions are depicted in bold italic print.
To assist those unfamiliar with some of the more technical terms encountered within the glossary, a number of illustrated, cameo descriptions are also provided. They are presented as boxed entries for ease of reference. Where relevant to a term being described the boxed descriptions are referenced by a “see description” summary. For example the term ‘near field’ may be defined within the Glossary and an illustrated-boxed description provided to describe its significance in relation to other field descriptions, such as ‘far field’.
The Glossary is also accompanied by a list of abbreviations and acronyms that are part or relevant to the subject of radio frequency identification.
RFID Glossary Page 3 of 33
The RFID Data Flow Model Source Data
(in binary form)
Source Encoding (Data + data structure format, data identifiers, commands and error control)
Channel Encoding (Bit encoding scheme, e.g. Non-return to zero, Manchester, Miller, ….)
Read/interrogate Store to Transponder
Modulation (e.g. Amplitude, frequency & phase shift keying)
Transmit
Communication (Air interface - frequency and power
considerations and issues of legislation)
Two-way communication protocols
Demodulation (Reader/Interrogator)
Anti-contention management (as appropriate)
Channel Decoding
Source decoding
Recovered source data (Error control management)
Key: Programming Interrogation
RFID Glossary Page 4 of 33
Glossary of Terms
Active Tag Colloquial term for a radio frequency transponder powered partly or completely by a battery. Batteries may be replaceable or sealed within the device (when the term unitised active tag is sometimes used). Compare Passive Tag.
Active Transponder A battery-powered data carrying device that reacts to a specific, reader produced, inductively coupled or radiated electromagnetic field, by delivering a data modulated radio frequency response.
Compare Passive Transponder (Tag).
Addressability The ability to address bits, fields, pages, files or other defined areas of memory within a radio frequency tag.
Air Interface The conductor-free medium, usually air, between a transponder and the reader/interrogator through which data communication is achieved by means of a modulated inductive or propagated electromagnetic field.
AIM Automatic Identification Manufacturers – Generic abbreviation for Automatic Identification Manufacturer Trade Associations including AIM Inc., AIM UK, AIM Germany etc.– See Contact list for further information.
Alignment A term to express the orientation of a transponder, relative to the reader/interrogator antenna. Alignment can influence the degree of coupling between transponder and reader, separation being a further influence.
Alphanumeric Strictly data comprising both alphabetical and numeric characters. For example, A1234C9 as an alphanumeric string. The term is often used to include other printable characters such as punctuation marks.
Amplitude Modulation (AM) Representation of data or signal states by the amplitude of a fixed frequency sinusoidal carrier wave. Where data is in binary form the modulation involves two levels of amplitude and is referred to as Amplitude Shift Keying (ASK).
Amplitude Shift Keying (ASK) Representation of binary data states, 0 and 1, by the amplitude of a fixed frequency sinusoidal carrier wave. Where the amplitudes are determined by the carrier being switched on and off, the process is known as On-Off Keying (OOK).
Antenna A conductive structure specifically designed to couple or radiate electromagnetic energy. In a driven mode the structure is a transmitter antenna. In receiver mode the structure is a receiver antenna. Antenna structures, often encountered in radio frequency identification systems, may be used to both transmit and receive electromagnetic energy, particularly data modulated electromagnetic energy.
See also dipole.
Anti-clash
(Anti-contention)
A term describing a facility for avoiding contention at the reader/interrogator receiver for responses arising from transponders simultaneously present within the read or interrogation zone of a radio frequency identification system and competing for attention at the same
RFID Glossary Page 5 of 33
time.
ASCII (American Standard Code for Information Interchange)
A binary code comprising 128 alphanumeric and control characters, each encoded with 7 bits.
ASN.1 (Abstract Syntax Notation. 1)
A syntax language for communicating processes, including transfer syntax or rules for converting variables, commands and requests into forms that are hardware independent.
Asynchronous Transmission (Start/stop transmission)
A method of data transmission that does not require timing or clocking information in addition to data. Transmission is achieved by receiver reference to start and stop bits positioned at the beginning and end of each character or blocks of characters. A variable time interval can exist between characters or blocks of characters.
Compare Synchronous transmission.
Awake The condition of a transponder when it is able to respond to interrogation.
Backscatter Modulation A process whereby a transponder responds to a reader/interrogation signal or field by modulating and re-radiating or transmitting the response signal at the same carrier frequency.
Batch Reading The process or capability of a radio frequency identification reader/interrogator to read a number of transponders present within the system’s interrogation zone at the same time.
Alternative term for Multiple Reading.
Bandwidth The range or band of frequencies, defined within the electromagnetic spectrum, that a system is capable of receiving or delivering.
Baud A unit of signalling or transmission speed representing the number of signalling events per unit time. When the signal event is a single bit, binary state representation, the baud is equivalent to the bit rate, expressed in bits per second (bps).
Compare Data Transfer Rate.
BCC (Block Check Character) A parity error checking character added to data for the purposes of detecting transmission errors.
BER (Bit Error Rate) The ratio of the number of bits received in error to the total of bits transmitted.
Bi-directional A term used to describe the capability of two way communication.
Binary (Binary Number System)
A column-placing numbering system in which numbers are expressed as powers of 2 (…..23 22 21 20) using the digits, 0 and 1 to distinguish the weighting of powers to represent the number concerned. E.g. 2510 = 0x25 1x24 1x23 0x22 0x21 1x20 = 011001
Binary Coded Decimal (BCD) Representation of decimal numbers in binary form using a group of four bits to represent an individual digit (0-9). E.g.. 0011 1000 = 3810
Bit Abbreviation for binary digit. A single element (0,1) in a binary number.
RFID Glossary Page 6 of 33
Bit rate Rate at which bits are electronically communicated, measured in bits.s-1
Bit Error Rate (BER) The ratio of the number of bits received that are found to be in error to the total number of bits transmitted.
Bi-phase coding A generic term for line or channel encoding schemes of the Manchester coding type in which each bit in the source code is replaced by two bits in the derived format.
Block Code Error detection codes having a fixed length code format, wherein k message bits are accompanied by c parity bits to form an n-bit block code (n = k + c)
Byte A group of bits, usually eight, used to represent characters in a binary processing system.
Capacity - Data A measure of the data, expressed in bits or bytes, that can be stored in a transponder. The measure may relate simply to the bits that are accessible to the user or to the total assembly of bits, including data identifier and error control bits.
Compare Capacity – Channel.
Capacity - Channel A measure of the transmission capability of a communication channel expressed in bits.s-1 and related to channel bandwidth and signal to noise ratio by the Shannon equation;
Capacity, C = B log2 (1 + S/N), where B is the bandwidth and S/N the signal to noise ratio.
Compare Capacity - Data
Capture Field/Area/Zone
(also Interrogation Zone/ Area/Volume)
The region of the electromagnetic field, determined by the reader/interrogator antenna, in which the transponders are signalled to deliver a response.
Carrier Abbreviated term for Carrier Frequency.
Carrier Frequency The frequency used to carry data by appropriate modulation of the carrier waveform, typically in a radio frequency identification system, by amplitude shift keying (ASK), frequency shift keying (FSK), phase shift keying (PSK) or associated variants.
See also Tolerance.
CEPT (Conférence Européenne des Administrations des Postes et Télécommunications)
The body responsible for European efficient utilisation of Spectrum and related regulatory matters.
Channel A medium or medium associated allocation, such as carrier frequency, for electronic communication.
Channel encoding The application of coding schemes to facilitate effective channel transmission of the source encoded data.
RFID Glossary Page 7 of 33
Compare Source encoding. See also Channel decoding.
Channel decoding The process of operating upon a received transmission to separate the source-encoded data from the channel encoded form.
Compare Source decoding. See also Channel encoding.
Character set A set of characters assembled to satisfy a general or application requirement.
Checksum A summation of check digits used to determine if an error has occurred in the transmission of data.
Chip In data communication terms, the smallest duration of a pseudo-random code sequence used in spread spectrum communication systems.
Chipping The process of moving from one chip to another in a spread spectrum transmission process, each chip being representative of a different spectral component or tone in the spread spectrum band.
See also Frequency Hopping Spread Spectrum.
Clocking information Timing signals or pulses used to synchronise the transfer of data from a source to a host destination.
Closed Systems Within the context of radio frequency identification, they are systems in which data handling, including capture, storage, and communication are under the control of the organisation to which the system belongs.
Compare with Open Systems.
Code Plate An alternative colloquial term for transponder or tag.
Collision A term to denote an event in which two or more data communication sources compete for attention at the same time and cause a clash of data, inseparable without some means of anti-collision or contention management.
Collision avoidance A means of avoiding collisions or clashes of data from different sources competing for attention at the same time.
See also Anti-clash (Anti-contention)
Compatibility The condition that exists between devices or systems that exhibit equivalent functionality, interface features and performance to allow one to be exchanged for another, without alteration, and achieve the same operational service. An alternative term for Interchangeability.
Compare Interoperability.
Concatenation The facility to link together specific items of data, held in data carriers, to form a single file or field of data.
RFID Glossary Page 8 of 33
Continuous reporting A mode of reader/interrogator operation wherein the identification of a transponder is reported or communicated continuously while the transponder remains within the interrogation field. See also In-field Reporting.
Continuous Wave Modulation (CW)
A data modulation scheme in which the data is represented by the carrier signal being switched on and off. The scheme is identical to amplitude shift keying (ASK) with 100% depth of modulation – known as on-off keying (OOK).
Control Characters Characters within a character set which are used to denote a particular control function, such as new line, shift and print control.
Concentrator A means of connecting a number of data communication devices and concentrating packets of data at a local point before onward transmission on a single link to a central data processor or information management system. In contrast to multiplexors concentrators usually have a buffering capability to ‘queue’ inputs that would otherwise exceed transmission capacity.
See also Multiplexor.
Contention (Clash) Term denoting simultaneous transponder responses capable of causing potential confusion, and misreading, within a reader/interrogator system unequipped with anti-contention facilities.
Corruption - data In data terms, the manifestations of errors within a transmitted data stream due to noise, interference or distortion.
Cyclic Redundancy Check (CRC)
An error detection algorithm which exploits the attributes of modulo-2 arithmetic to generate, through the use of a generator polynomial, a transmission polynomial, comprising the message polynomial and a parity polynomial.
Data Representations, in the form of numbers and characters for example, to which meaning may be ascribed.
Compare with Information.
Data Capacity See Capacity - Data
Data error rate See Bit Error Rate
Data flow model See chart at start of document.
Data Rate (Data Transfer Rate) In a radio frequency identification system, the rate at which data is communicated between transponder and the reader/interrogator, expressed in baud, bits.s-1 or bytes.s-1
Data Field A defined area of memory assigned to a particular item or items of data.
Data Field Protection The facility to control access to and operations upon items or fields of data stored within the transponder.
Data Identifier A specific character, or string of characters, that denotes the nature or intended use of the data that follows.
RFID Glossary Page 9 of 33
Data transfer The process of transferring data from a data holding source to a destination.
Data Transfer Rate See Data Rate.
Demodulation Process of recovering channel encoded data from a modulated carrier waveform.
Compare Modulation.
De-tuning The reduction in performance of transponders and readers/interrogators caused by the close proximity of metal influencing the resonance of an electronic tuned circuit.
Dipole (antenna) A fundamental form of antenna, comprising a single conductor of length approximately equal to half the wavelength of the carrier wave. Provides the basis for a range of other more complex forms of antenna.
Directivity - antenna The ability of an antenna to concentrate radiated energy in a preferred direction, when considered in a transmitter mode. Alternatively, the ability to reject signals that are off-axis to the normal of the antenna, when considered in the receiver mode. May be expressed as a ratio of power radiated per unit solid angle in a defined direction to the total power radiated by the antenna.
See also Efficiency – antenna.
Direct Sequence Spread Spectrum (DSSS)
A category of spread spectrum modulation in which the source base-band bit stream is multiplied by a fast pseudorandom binary sequence to produce a signal that exhibits broad-band characteristics. Alternatively, the pseudorandom sequence and its inverse are used to represent logic 1 and 0.
See also Frequency Hopping Spread Spectrum
Dispersion - pulse The spread in duration and form experienced by a pulse in transmission through a communication channel.
See also Intersymbol Interference.
Distortion Any disturbance that causes an unwarranted change in the form or intelligibility of a signal. The distortion exhibits a noise-like effect that can be quantified as the ratio of the magnitude of the distortion component to the magnitude of the undistorted signal, usually expressed as a percentage.
See also Signal to Noise Ratio and Signal to Noise and Distortion Ratio.
Downlink Term which defines the direction of communications as being from reader/interrogator to transponder. Alternative term for Forward Link.
Compare Uplink
Effective Isotropic Radiated Power (EIRP)
The product of the input power to an antenna and the gain relative to an isotropic source.
RFID Glossary Page 10 of 33
Effective Aperture A term denoting the reception capability of a practical antenna expressed as the product of actual aperture and antenna efficiency.
See ‘Propagation’ summary box.
Efficiency - antenna Two components distinguishable, radiation efficiency and aperture efficiency. Radiation efficiency is expressed as the ratio of total power radiated by the antenna to total power accepted by the antenna from source – for the transmission mode. Aperture efficiency is expressed as the ratio of effective antenna area to the real area of the antenna.
Electromagnetic Coupling A process of transferring modulated data or energy from one system component to another, reader to transponder for example, by means of an electromagnetic field.
Electromagnetic energy A process of transferring modulated data or energy from one system component to another, reader to transponder for example, by means of an electromagnetic field.
Electromagnetic Field The spatial and temporal manifestation of an electromagnetic source in which magnetic and electric components of intensity can be distinguished and plotted as contours, like contour lines on a map, the planes of the electric and magnetic contours being at right angles to one another. Where the source is varying in time so too the field components vary with time. Where the source launches an electromagnetic wave the field may be considered to be propagating.
See also ‘Electromagnetic Waves’ summary box.
Electromagnetic spectrum The range or continuum of electromagnetic radiation, characterised in terms of frequency or wavelength.
Electromagnetic wave A sinusoidal wave in which electric E and magnetic H components or vectors can be distinguished at right angles to one another, and propagating in a direction that is at right angles to both the E and H vectors. The energy contained within the wave also propagates in the direction at right angles to the E and H vectors. The power delivered in the wave is the vector product of E and H (Poynting Vector).
RFID Glossary Page 11 of 33
Electromagnetic Waves Electromagnetic waves are characterised by two field components, a magnetic (H) component and an electric (E) component. These components are mutually perpendicular to each other and to the direction of propagation, as illustrated below.
Planar electromagnetic wave E
H
The ratio of E to H is known as the wave impedance (Zw). This constitutes a useful indicator of the nature of the field. If Zw is low in value it represents a low impedance source characterised by a high H field, arising from relatively high current flow in the generating circuit, compared with the electric E field component. This is characteristic of an inductive source. If Zw is large in value, it represents a high impedance source, characterised by a large E field component, arising from a relatively high voltage in the generating circuit, compared with the magnetic, H field component.
Electronic Data Interchange (EDI)
Communication of a data message, or messages, automatically between computers or information management systems, usually for the purposes of business transactions.
Electronic Data Transfer (EDT) The transfer of data by electronic communication means from one data handling system to another.
Electronic Label An alternative colloquial term for a transponder.
Encryption of data A means of securing data, often applied to a plain or clear text, by converting it to a form that is unintelligible in the absence of an appropriate decryption key.
See also Scrambling.
Environmental Parameters Parameters, such as temperature, pressure, humidity, noise that can have a bearing or impact upon system performance.
Error In digital data terms, a result of capture, storage, processing or communication of data in which a bit or bits assume the wrong values, or bits are missing from a data stream.
Error burst A group of bits in which two successive erroneous bits are always separated by less than a given number of correct bits.
Error control Collective term to accommodate error detection and correction schemes applied to handle errors arising within a data capture or handling system.
RFID Glossary Page 12 of 33
See also Redundancy.
Error detection A term to denote a scheme or action to determine the presence of errors in a data stream.
Error correction A term to denote a scheme or action for correcting an error detected in a data stream.
Error correcting code (ECC) Supplemental bits introduced or source encoded into a data stream to allow automatic correction of erroneous bits and/or derivation of missing bits, in accordance with a specific computational algorithm.
Error correcting mode Mode defined for a data communication or handling process in which missing or erroneous bits are automatically corrected.
Error correcting protocol The rules by which an error correcting mode operates.
Error management Techniques used to identify and/or correct errors within a data capture and handling system with the objective of assuring the accuracy of data presented to the system user.
Error rate See Bit Error Rate.
ETSI (European Telecommunications Standards Institute)
The European standards organisation responsible for standardisation in telecommunications.
Exciter The electronic circuits used to drive an antenna. The combination of exciter and antenna is often referred to as the transmitter or scanner.
Extended Binary Coded Data Interchange Code (EBCDIC)
An eight-bit binary code set, sometimes referred to as extended ASCII, wherein the 128 character set of ASCII are accommodated, together with other characters and control functions, making up a total set of 256 characters.
Factory Programming The entering of data into a transponder as part of the manufacturing process, resulting in a read-only tag.
Compare Field Programming.
False Activation The result of a ‘foreign’ or non-assigned transponder entering the interrogation zone of a radio frequency identification system and effecting a response, erroneous or otherwise.
Far Field The region of an electromagnetic radiation field at a distance from the antenna in which the field distribution is unaffected by the antenna structure and the wave propagates as a plane wave.
Compare Near Field.
Field of View The zone surrounding a reader/interrogator in which the reader/interrogator is capable of communicating with a transponder.
Field Programming Entry of data by an original equipment manufacturer (OEM) or user into a transponder by means of a proprietary programming system, usually undertaken before the device is attached to the item to be identified or accompanied. This facility is usually associated with Write Once Read
RFID Glossary Page 13 of 33
Many (WORM) and read/write (RW) devices.
The data entered into a transponder may be by a combination of factory and field programming.
Compare In-use Programming.
Field Protection See Data Field Protection.
Field Strength The intensity of a field measured in units appropriate to the field concerned. Electric field strengths are measured in volts per metre (V.m-1) and magnetic field strengths in amperes per metre (A.m-1).
File A set of data stored within a computer, portable data terminal or information management system.
Filler Character A redundant character inserted into a data field simply to achieve a desired field length. Also known as a pad character.
Forward Link Communications from reader/interrogator to transponder. Alternatively known as Downlink.
Compare Uplink.
Frequency The number of cycles a periodic signal executes in unit time. Usually expressed in Hertz (cycles per second) or appropriate weighted units such as kilohertz (kHz), Megahertz (MHz) and Gigahertz (GHz).
Frequency Hop Rate The frequency at which a frequency hopping spread spectrum (FHSS) system moves between transmission frequencies. It is equal to the reciprocal of the dwell time at a FHSS centre frequency.
Frequency Hop Sequence A pseudorandom binary sequence (PRBS) determining the hopping frequencies used in frequency hopping spread spectrum (FHSS) systems.
Frequency Hopping Spread Spectrum (FHSS)
A category of spread spectrum modulation in which each bit of data is divided into chips and each chip is represented by a different spectral component or tone in the spread spectrum band using a pseudorandom sequence to assign tones. Modulated in this way the transmissions hop from frequency to frequency within the band, requiring a receiver synchronised to the pseudorandom chipping sequence to recover the data.
See also Direct Sequence Spread Spectrum.
Frequency Modulation (FM) Representation of data or signal states by using different transmission frequencies. Where data is in binary form the modulation constitutes two transmission frequencies and is referred to as Frequency Shift Keying (FSK).
Frequency Shift Keying (FSK) Representation of binary data by switching between two different transmission frequencies.
Full Duplex (FDX) A channel communications protocol that allows a channel to transmit data in both directions at the same time. In RFID, the method of information exchange in which the information is communicated while the transceiver transmits the activation field.
RFID Glossary Page 14 of 33
Compare Half Duplex.
Handshaking A protocol or sequence of signals for controlling the flow of data between devices, which can be hardware implemented or software implemented.
Half Duplex (HDX) A channel communications protocol that allows a channel to transmit data in both directions but not at the same time. In RFID, the method of information exchange in which the information is communicated after the transceiver has stopped transmitting the activation field.
Compare Full Duplex.
Harmonics Multiples of a principal frequency, invariably exhibiting lower amplitudes. Harmonics can be generated as a result of circuit non-linearities associated with radio transmissions resulting in harmonic distortion.
See also Spurious emissions.
Hexadecimal (Hex) A column placing method of representing data to the base of 16, using digits 0-9 and letters A to F for decimal values 10 - 15. For example, 1010 = A16 and 2210 = 6F16 Used as a convenient short hand notation for representing 16 and 32 bit memory addresses.
ID Filter A software facility that compares a newly read identification (ID) with those within a database or set, with a view to establishing a match.
Impact Any influence upon a system, environmental or otherwise, that can influence its operational performance.
Incorrect Read The failure to read correctly all or part of the data set intended to be retrieved from a transponder during read or interrogation process. Alternative term for Misread..
In-Field Reporting A mode of operation in which a reader/interrogator reports a transponder ID on entering the interrogation zone and then refrains from any further reports until a prescribed interval of time has elapsed.
See also Out of Field Reporting.
In-Use Programming The ability to read from and write to a transponder while it is attached to the object or item for which it is being used.
Compare Factory Programming, Field Programming.
Inductive coupling A process of transferring modulated data or energy from one system component to another, reader to transponder for example, by means of a varying magnetic field.
Information - general Something which is meaningful. Data may be regarded as information once its meaning is revealed.
Information - theoretic A measure of the scarcity or probability of occurrence of an event. The more scarce the event the more information conveyed.
Interface A physical or electrical interconnection between communicating devices.
RFID Glossary Page 15 of 33
See also RS232, RS422 and RS485.
Interference Unwanted electromagnetic signals, where encountered within the environment of a radio frequency identification system, cause disturbance in its normal operation, possibly resulting in bit errors, and degrading system performance.
Interchangeability The condition that exists between devices or systems that exhibit equivalent functionality, interface features and performance to allow one to be exchanged for another, without alteration, and achieve the same operational service. An alternative term for compatibility.
Compare Interoperability.
Interoperability The ability of systems, from different vendors, to execute bi-directional data exchange functions, in a manner that allows them to operate effectively together.
Compare Compatibility, Interchangeability.
Interrogation The process of communicating with, and reading a transponder
Interrogator A fixed or mobile data capture and identification device using a radio frequency electromagnetic field to stimulate and effect a modulated data response from a transponder or group of transponders present in the interrogation zone. Often used as an alternative term to Reader.
See also Reader.
Interrogation zone The region in which a transponder or group of transponders can be effectively read by an associated radio frequency identification reader/interrogator.
Intersymbol Interference Interference arising within a serial bit stream as a result of pulse dispersion and consequential overlapping pulse edges, leading possibly to decoding errors at the receiver.
Isotropic source An ideal electromagnetic source or radiator exhibiting a perfect spherical energy radiation pattern.
Lifetime The period of time during which an item of equipment exists and functions according to specification.
See also Mean time between failures and Mean Time to Repair.
Manchester coding A bi-phase code format in which each bit in the source encoded form is represented by two bits in the derived or channel encoded form. The transformation rule ascribes 01 to represent 0 and 10 to represent 1.
Manufacturers Tag ID (MfrTagID)
A reference number which uniquely identifies the tag.
Mean time between failures (MTBF)
The average or mean time interval between failures, often expressed as the reciprocal of the constant failure rate.
Mean time to repair The length of time that a system is non-operational between failure and repair
RFID Glossary Page 16 of 33
repair.
Memory A means of storing data in electronic form. A variety of random access (RAM), read-only (ROM), Write Once-Read Many (WORM) and read/write (RW) memory devices can be distinguished.
Memory Modules Colloquial term for a read/write or re-programmable transponder.
Misread A condition that exists when the data retrieved by the reader/interrogator is different from the corresponding data within the transponder.
Alternative term for Incorrect Read.
See Incorrect Read.
Modulation A term to denote the process of superimposing (modulating) channel encoded data or signals onto a radio frequency carrier to enable the data to be effectively coupled or propagated across an air interface. Also used as a associative term for methods used to modulate carrier waves. Methods generally rely on the variation of key parameter values of amplitude, frequency or phase. Digital modulation methods principally feature amplitude shift keying (ASK), frequency shift keying (FSK), phase shift keying (PSK) or variants.
See also Amplitude, Frequency and Phase Modulation, Amplitude Shift Keying, Frequency Shift Keying and Phase Shift Keying.
Modulation Index The size of variation of the modulation parameter (amplitude, frequency or phase) exhibited in the modulation waveform.
Multiple Reading The process or capability of a radio frequency identification reader/interrogator to read a number of transponders present within the system’s interrogation zone at the same time.
Alternative term for Batch Reading.
Multiplexor (Multiplexer) A device for connecting a number of data communication channels and combining the separate channel signals into one composite stream for onward transmission through a single link to a central data processor or information management system. At its destination the multiplexed stream is de-multiplexed to separate the constituent signals. Multiplexors are similar to concentrators in many respects, a distinction being that concentrators usually have a buffering capability to ‘queue’ inputs that would otherwise exceed transmission capacity.
See also Concentrator.
Near field The region of an electromagnetic field comprising two components, the reactive Rayleigh region immediately surrounding the antenna and a radiating near field or Fresnel component which exists when the major dimension of the antenna, D, is large compared with the wavelength, λ, of transmission.
Noise Unwanted extraneous electromagnetic signals encountered within the environment, usually exhibiting random or wide band characteristics, and viewed as a possible source of errors through influence upon system performance.
RFID Glossary Page 17 of 33
Compare Interference.
Noise immunity A measure of the extent or capability of a system to operate effectively in the presence of noise.
Omnidirectional A description of a transponder's ability to be read in any orientation.
On-off Keying (OOK) A special case of amplitude shift keying (ASK) in which the carrier is switched between full carrier amplitude and zero or absence of carrier amplitude, according to data value (1 or 0).
Open Systems Within the context of radio frequency identification, they are systems in which data handling, including capture, storage and communication, is determined by agreed standards, so allowing various and different users to operate without reference to a central control facility.
Compare with Closed System.
Orientation The attitude of a transponder with respect to the antenna, expressed in three dimensional angular terms, with range of variation expressed in terms of skew, pitch and roll.
Orientation Sensitivity The sensitivity of response for a transponder expressed as a function of angular variation or orientation.
Out of Field Reporting A mode of operation in which the identification of a transponder is reported as or once the transponder leaves the reader interrogation zone.
Parity A simple error detecting technique, used to detect data transmission errors, in which an extra bit (0 or 1) is added to each binary represented character to achieve an even number of 1 bits (even parity) or an odd number of 1 bits (odd parity). By checking the parity of the characters received a single errors can be detected. The same principle can be applied to blocks of binary data.
Passive Transponder (Tag) A battery-free data carrying device that reacts to a specific, reader produced, inductively coupled or radiated electromagnetic field, by delivering a data modulated radio frequency response. Having no internal power source, passive transponders derive the power they require to respond from the reader/interrogator's electromagnetic field.
Compare Active Transponders (Tags).
Penetration Term used to indicate the ability of electromagnetic waves to propagate into or through materials. Non-conducting materials are essentially transparent to electromagnetic waves, but absorption mechanisms, particularly at higher frequencies, reduce the amount of energy propagating through the material. Metals constitute good reflectors for freely propagating electromagnetic waves, with very little of an incident wave being able to propagate into the metal surface.
Phase Modulation (PM) Representation of data or signal states by the phase of a fixed frequency sinusoidal carrier wave. Where data is in binary form the modulation involves a phase difference of 180o between the binary states and is referred to as Phase Shift Keying (PSK).
RFID Glossary Page 18 of 33
Phase Shift Keying (PSK) Representation of binary data states, 0 and 1, by the phase of a fixed frequency sinusoidal carrier wave, a difference of 180o being used to represent the respective values.
Polar Field Diagram A graphical representation of the electric or magnetic field intensity components of an electromagnetic field, expressed on a polar co-ordinate system (distance v angle, through 360o). Typically used to illustrate the field characteristics of an antenna.
Polarisation The locus or path described by the electric field vector of an electromagnetic wave, with respect to time.
See Polarisation summary.
Polarisation Summary
Polarisation is a term that often arises in the literature and when considering radio frequency communication and RFID. The polarisation of a propagating wave is determined by the locus or path described by the electric field vector with respect to time. If we ascribe an x, y, z co-ordinate system to a propagating wave as illustrated below, with the direction of propagation being in the z direction, the electric field vector, E will be in the x, y plane. If E remains in the same orientation with respect to time, so that its locus describes a straight line, the wave is said to be linearly polarised. However, if the locus describes a circular motion with respect to time the wave is said to be circularly polarised. Where the locus describes an elliptical path the wave is said to be elliptically polarised.
Circular polarisation is often used in communication systems since the orientation of the transmitting and receiving antenna is less important than it is with linearly polarised waves. The magnetic vector, H, always remains perpendicular to the E vector. Using an IEEE convention, a clockwise circular rotating wavefront approaching a receiver is defined as being left-hand circular (LHC) polarised. The power in the wavefront is expressed in the form of the Poynting vector, P = E x H = E x H sin θ, where θ is the phase angle between E and H.
RFID Glossary Page 19 of 33
y
x
z
Pr
θ
ϕ
y
x
y
x
y
x
Linearpolarisation
Circularpolarisation
Ellipticalpolarisation
Port Concentrator A device that accepts the outputs from a number of data communication interfaces for onward transmission into a communications network.
See also Concentrator, Multiplexor.
Power-levels and flux density The vector product of electric and magnetic field strengths within an electromagnetic wave, expressed as levels in watts and as a power flux density, measured at a distance from the source, in watts per square metre (W.m-2). Low power radio frequency transmissions are generally expressed in milli- or microwatts.
It is usual to express the levels and flux densities in terms of decibels, whereby the power level is referenced to an appropriate level, such as a watt or a milliwatt. Using this approach levels are distinguished in dBW (reference to 1 watt) and dBm (referenced to 1mW) and power flux densities in terms of dBW.m-2.
Note: Power level (dB) = 10 log10 Pr/Pref
where Pr is the measured power and Pref the reference power level.
Programmability The ability to enter data and to change data stored in a transponder.
Programmer An electronic device for entering or changing (programming) data in a transponder, usually via a close proximity, inductively coupled data transfer link.
RFID Glossary Page 20 of 33
Programming The act of entering or changing data stored in a transponder.
Projected lifetime The estimated lifetime for a transponder often expressed in terms of read and/or write cycles or, for active transponders, years, based upon battery life expectancy and, as appropriate, read/write activity.
Protocol A set of rules governing a particular function, such as the flow of data/information in a communication system.
Proximity Term often used to indicate closeness of one system component with respect to another, such as that of a transponder with respect to a reader.
Proximity sensor An electronic device that detects and signals the presence of a selected object. When used in association with a radio frequency identification system the sensor is set up to sense the presence of a tagged or transponder carrying object when it enters the vicinity of the reader/interrogator so that the reader can then be activated to effect a read.
Pulse dispersion The spread in width or duration of a pulse during transmission through a practical transmission system, due to the influence of distributed reactive components
Radio frequency identification system
An automatic identification and data capture system comprising one or more reader/interrogators and one or more transponders in which data transfer is achieved by means of suitably modulated inductive or radiating electromagnetic carriers.
Radio Frequency Tag Alternative term for a transponder.
Range - Read The maximum distance between the antenna of a reader/interrogator and a transponder over which the read function can be effectively performed. The distance will be influenced by orientation and angle with respect to the antenna, and possibly by environmental conditions.
Range - Programming The maximum distance between the antenna of a reader/interrogator and a transponder over which a programming function can be effectively performed. Usually shorter than the read range, but may be influenced by orientation and angle with respect to the antenna, and possibly by environmental conditions.
Read The process of retrieving data from a transponder and, as appropriate, the contention and error control management, and channel and source decoding required to recover and communicate the data entered at source.
Readability The ability to retrieve data under specified conditions.
Reader/Interrogator
Reader/Writer
An electronic device for performing the process of retrieving data from a transponder and, as appropriate, the contention and error control management, and channel and source decoding required to recover and communicate the data entered at source.
The device may also interface with an integral display and/or provide a parallel or serial communications interface to a host computer or industrial controller.
RFID Glossary Page 21 of 33
Read Only Term applied to a transponder in which the data is stored in an unchangeable manner and can therefore only be read.
See also Factory Programming.
Read Rate The maximum rate at which data can be communicated between transponder and reader/interrogator, usually expressed in bits per second (bps or bits.s-1).
Read/Write Applied to a radio frequency identification system, it is the ability both read data from a transponder and to change data (write process) using a suitable programming device.
See Reader/Interrogator
Redundancy In information terms it is a term to describe the additional bits, such as those for error control or repeated data, over and above those required for transmitting the information message.
Reprogrammability The ability to change the data content of a transponder using a suitable programming device.
See also In-use Programming.
RF Tag Alternative, short hand term for a transponder.
RS232 A common physical interface standard specified by the EIA for the interconnection of devices. The standard allows for a single device to be connected (point-to-point) at baud values up to 9600 bps, at distances up to 15 metres. More recent implementations of the standard may allow higher baud values and greater distances.
RS422 A balanced interface standard similar to RS232, but using differential voltages across twisted pair cables. Exhibits greater noise immunity than RS232 and can be used to connect single or multiple devices to a master unit, at distances up to 3000 metres.
RS485 An enhanced version of RS422, which permits multiple devices (typically 32) to be attached to a two wire bus at distances of over one kilometre.
SAW (Surface Acoustic Wave) devices
Devices using a transponder technology in which low power microwave signals are converted to ultrasonic waves by and on the surface of a piezoelectric crystal material forming the tag. Surface applied ‘finger’ transducers determine the form and data content of the reflected return signal.
Scrambling The rearrangement or transposition of data to enhance security of stored data or the effectiveness of error control schemes.
Scanner The combination of antenna, transmitter (or exciter), and receiver into a single unit is often referred to as a scanner. With the addition of electronics to perform the necessary decoding and management functions to deliver the source data, the unit becomes a reader.
Screening The process of avoiding or minimising electromagnetic interference by use of electromagnetic reflective and absorptive materials, suitably structured or positioned to reduce interaction between the source of potential
RFID Glossary Page 22 of 33
interference and the circuit being protected.
Sensor An electronic device that senses a physical entity and delivers an electronic signal that can be used for control purposes.
Separation A term used to denote the operational distance between two transponders.
Signal to Noise (S/N) The ratio of signal level to the level of noise present in a system, usually expressed in decibels.
Signal to Noise & Distortion (SINAD)
The ratio of combined signal, noise and distortion levels to the combined level of noise and distortion present in a system.
Sinusoidal carrier A fundamental waveform, characterised by a single frequency and wavelength, used to carry data or information by modulating some feature of the waveform.
See also Modulation.
Source Decoding The process of recovering the original or source data from a received source encoded bit stream.
Compare Source Encoding.
See also Data Flow Model.
Source Encoding The process of operating upon original or source data to produce an encoded message for transmission.
Compare Source Decoding.
See also Data Flow Model.
Spectrum - electromagnetic The continuum of electromagnetic waves, distinguished by frequency components and bands that exhibit particular features or have been used for particular applications, including radio, microwave, ultraviolet, visual, infrared, X-rays and gamma rays.
Spectrum - signal Expression used to denote the make-up of a signal or waveform in terms of sinusoidal components of different frequency and phase relationship (spectral components).
Spectrum Mask The maximum power density of a transmission expressed as a function of frequency.
Spurious Emissions Usually denotes unwanted electromagnetic harmonics. Type Approval testing includes measurement of harmonic emissions arising from the reader, to ensure they are within specified limits.
Spread Spectrum Techniques for uniformly distributing or spreading the information content of a data carrying signal over a frequency range considerably larger than required for narrow band communication, allowing data to be recoverable under conditions of strong interference and noise.
SRD (Short range Device) A tag that is used at short range (less than 100mm)
Synchronisation The process of controlling the transmission of data using a separate or derived clocking signal
RFID Glossary Page 23 of 33
derived clocking signal.
Synchronous transmission A method of data transmission that requires timing or clocking information in addition to data.
Tag Colloquial term for a transponder. Commonly used and the term preferred by AIM for general usage.
Tolerance The maximum permissible deviation of a system parameter value, caused by any system or environmental influence or impact. Usually expressed in parts per million (ppm).
Tolerances are specified for a number of radio frequency parameters, including carrier frequencies, sub-carriers, bit clocks and symbol clocks.
Transceiver A TRANSmitter/reCEIVER device used to both receive and transmit data.
See also Transmitter
Compare Transponder
Transmitter (Exciter) An electronic device for launching an electromagnetic wave or delivering an electromagnetic field for the purpose of transmitting or communicating energy or modulated data/information. Often considered separately from the antenna, as the means whereby the antenna is energised. In this respect it is also referred to as an exciter.
Transponder An electronic TRANSmitter/resPONDER, commonly referred to as a Tag.
Unitised active tag An active tag or transponder in which the batteries are replaceable or sealed within the device.
Uplink Term which defines the direction of communications as being from transponder to reader/interrogator.
Compare Downlink
Vector A quantitative component that exhibits magnitude, direction and sense.
Verification The process of assuring that an intended operation has been performed.
Write The process of transferring data to a transponder, the internal actions of storing the data, which may also encompass the reading of data to verify the data content.
Write Rate The rate at which data is transferred to a transponder and stored within the memory of the device and verified. The rate is usually expressed as the average number of bits or bytes per second over which the complete transfer is performed.
Write Once Read Many (WORM)
Distinguishing a transponder that can be part or totally programmed once by the user, and thereafter only read.
RFID Glossary Page 24 of 33
Acronym List Acronym Meaning Web Address Comments or
Explanations ABA American Bankers
Association www.aba.com
AFNOR Association Francaise de Normalisation (National Body of France)
www.afnor.fr
AG CEN General Assembly AIAG Automotive Industry Action
Group www.aiag.org
AIF ANSI's International Advisory Committee Forum
ANSI American National Standards Institute (National Body of the United States)
www.ansi.org
APEC Asian Pacific Economic Cooperation group
B10 Subcommittee of NCITS for Identification Cards
BSI British Standards Institute (National Body of the United Kingdom)
www.bsi.org.uk
BT Technical Board BTS Technical Sector Boards CA (or CoA) IEC Committee of Action CD Committee Draft CDV Committee Draft for Vote CE Mark Harmonized European
mark for indicating conformance to relevant EU Directives
CEC Commission of European Communities
CEN Comité Européen Normalisation (European Committee for Standardization)
www.cenorm.be
CENELEC Comité Européen Normalisation Electrotechnique (European Committee for Electrotechnical Standardization)
www.cenelec.be
CEPT European Conference of Postal and Telecommunications Administrations
www.cept.org
CO Central Office COPANT Pan American Standards
Commission
CS Central Secretariat DIN Deutsches Institut für
Normung (National Body of the Germany)
www.din.de
RFID Glossary Page 25 of 33
DIS Draft International Standard DISA Data Interchange
Standards Association www.disa.org
DoC Department of Commerce DoD Department of Defense DSRC Dedicated Short Range
Communications
EBU European Broadcasting Union
EC European Commission EDIFACT Electronic Data Interchange
for Administration, Commerce, and Transport
EEA European Economic Area EETIS Electrical, Electronic,
Telecommunication, Information Technology Sectors
EFTA European Free Trade Association
EG ETSI Guides EN European Standard (i.e.,
European Norm)
ENV European Pre-standard EOTC European Organization for
Testing and Certification
ERC European Radiocommunications Committee
www.ero.dk/eroweb/erc.html
ERO European Radiocommunications Office
www.ero.dk
ETS European Telecommunications Standard
ETSI European Telecommunications Standards Institute
www.etsi.org
EU European Union EWOS European Workshop for
Open Systems
FCC Federal Communications Commission
www.fcc.gov
FCD Final Committee Draft FDIS Final Draft International
Standard
GA ISO or IEC General Assembly
GSM Global System for Mobile Communication
HD Harmonization Document HoD Head of Delegation IAC ANSI's International
Advisory Committee
IATA International Air Transport Association
www.iata.org
IEC International www.iec.ch
RFID Glossary Page 26 of 33
Electrotechnical Commission
I-ETS Interim European Telecommunications Standard
IMO International Maritime Organization
IS International Standard ISO International Organization
for Standardization www.iso.ch
ITI Information Technology Industry Council (Administrator for JTC1 TAG)
www.itic.com
ITTF Internationational Technology Task Force (JTC 1 Administrator)
ITU International Telecommunications Union
www.itu.int
JCG Joint ISO/CEN Coordinating Group of the Technical Boards
JCP The Joint Presidents group, i.e. the presidents and chief executive officers of CEN, CENELEC, and ETSI.
JPBMA Japan Business Machine Manufacturers Association
JTC 1 Joint Technical Committee 1 (Standards relating to information technology)
JTC1 ISO/IEC Joint Technical Committee 1 on Information Technology
www.jtc1.org
JTC1 TAG JTC1 Technical Advisory Group (forms US positions for international presentation)
www.jtc1tag.org
MCG IEC/CENELEC Management Coordination Group
MRA Mutual Recognition Agreement
NATO North Atlantic Treaty Organization
NB National Body NC National Committee NCITS National Committee for
Information Technology Standards (formerly X3)
www.ncits.org
NIST National Institute of Standards and Technology
www.nist.gov
NNI Nederlands Normalisatie-instituut (Dutch Standards Organization)
www.nni.nl
NP New work item proposal NSB National Standards Body
RFID Glossary Page 27 of 33
NVCASE National Voluntary Conformity Assessment System Evaluation
PASC Pacific Area Standards Congress
PC Programming Committee PQ Primary Questionnaire pr ETS Preliminary European
Telecommunications Standard
pr HD Preliminary Harmonization Document
pr I-ETS Preliminary Interim European Telecommunications Standard
prEN Preliminary European Standard
prENV Preliminary European Pre-standard
PSTN Public Switched Telephone Network
PTT Postal, Telephone and Telegraph
RA Registration Authority RES Radio Equipment and
Systems
SAA Standards Australia (National Body of Australia)
www.standards.com.au
SC Subcommittee SC17 JTC1 Subcommittee 17 on
Identification cards www.funkster.com/ossian
SC31 JTC1 Subcommittee 31 on Automatic Identification
www.uc-council.org/sc31/home.htm
SR Reporting Secretariat SRD Short Range Device T6 Subcommittee of NCITS for
noncontact systems interface
TAG Technical Advisory Group TC Technical Committee TC224 CEN Technical Committee
224 on Machine Readable Cards
TC225 CEN Technical Committee 225 on Bar Coding
TC251 CEN Technical Committee on Medical Informatics
TC278 CEN Technical Committee 278 on Road Transport and traffic telematics
TC68 ISO/IEC Technical Committee 68 on banking, securities, and other financial services
TF Task Force
RFID Glossary Page 28 of 33
TMB ISO Technical Management Board
TSP Technical Study Proposal (i.e., proposal for a new area of technical work in either ISO or IEC.)
UAP Unique Acceptance Procedure
UN United Nations UPU Universal Postal Union www.upu.int USNC U.S. National Committee of
the International Electrotechnical Commission
VA Vienna Agreement WD Working Draft WG Working Group WGn Working Group n of an ISO
subcommittee. Working group numbers may change from time to time.
WI Work Item WTO World Trade Organization X12 ANSI accredited committee
on electronic business data exchange (EDI)
RTLS Real Time Location Systems
A technique for installing a type of RF tag on assets and using multiple receivers to identify and locate the tags, usually in a local area environment.
RFID Glossary Page 29 of 33
Further Information This document has been published by AIM Inc. with input and co-operation from all AIM Affiliates. On the next page, you will find the contact information for all of the AIM Affiliates world-wide. You are invited to contact your local affiliate to determine the latest work that is in progress in the RFID arena or any other Automatic Identification and Data Capture Technology.
Further information on RFID technologies can be obtained from the RFID web site http://www.rfid.org
A list of all AIM publications can be obtained by visiting the AIM Global Web site at http://www.aimglobal.org
RFID Glossary Page 30 of 33
AIM Affiliate List
For copies of this document, contact AIM Inc. (AIM) or your closest Affiliate listed below.
AIM, Inc. 634 Alpha Drive Pittsburgh, PA 15238-2802 USA Tel: +1 412 963 8588 Fax: +1 412 963 8753 Email: [email protected] http://www.aimglobal.org Contact: Mr. Dan Mullen
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