ISO IEC 7811-6:2018 pdf free download.Identification cards – Recording technique Part 6 : Magnetic stripe : High coercivity.
1 Scope
ISO/IEC 7811 defines the characteristics for Identification cards as defined in Clause 3 of this document and the use of such cards for international interchange.
ISO IEC 7811-6 specifies requirements for a high coercivity magnetic stripe (including any protective overlay) on an identification card, the encoding technique and coded character sets. It takes into consideration both human and machine aspects and states minimum requirements.
Coercivity influences many of the quantities specified in ISO IEC 7811-6 but is not itself specified. The main characteristic of the high coercivity magnetic stripe is its improved resistance to erasure. This is achieved with minimal probability of damage to other magnetic stripes by contact while retaining read compatibility with magnetic stripes as defined in ISO/IEC 78 11-2.
ISO/IEC 7811 provides criteria to which cards are to perform. No consideration is given within lSO/ IEC 7811 to the amount of use, if any, experienced by the card prior to test. Failure to conform to specified criteria is negotiated between the involved parties.
lSO/IEC 10373-2 specifies the test procedures used to check cards against the parameters specified In ISO IEC 7811-6.
NOTE Numeric values in the SI and/or Imperial measurement system in this document may have been rounded off and are consistent with, but not exactly equal to each other. Using either system is correct but intermixing or reconverting values can result in errors. The original design was made using the Imperial measurement system.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of ISO IEC 7811-6. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 4287, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Terms, definitions and surface texture parameters
ISO/IEC 7810, Identification cards — Physical characteristics
ISO/IEC 10373-1, Identification cards — Test methods — Part 1: General characteristics
3.11
average signal amplitude
sum of the absolute value of the amplitude of each signal peak (U1) divided by the number of signal peaks (n) for a given track over the length of the magnetic stripe area
3.12
reference signal amplitude
Us
maximum value of the average signal amplitude of a reterence card corrected to the primary standard
3.13
physical recording density
number of flux transitions per unit length recorded on a track
3.14
bit density
number of data bits stored per unit ol length
3.15
bIt cell
distance between two clocking flux transitions as shown in Figure 11
3.16
subinterval
distance that is nominally half the distance between two clocking flux transitions as shown in Figure 11
3.17
demagnetisation current Id
D.C. current value that reduces the average signal amplitude to 80 % of the reference signal amplitude (Us) on a secondary reference card that has been encoded at a density of 20 ft/mm (500 ftpi) at a current of 1mrn
4 Conformance
A prerequisite for conformance with ISO IEC 7811-6 is conformance with ISO/IF.C 7810. An identification card Is in conformance with this document if it meets all mandatory requirements specified herein. Default values apply if no others are specified.
5 Physical characteristics of the Identification card
5.1 General
The identifIcation card shall conform to the specification given In ISO/IEC 7810.
WARNING — The attention of card Issuers Is drawn to the fact that Information held on the magnetic stripe may be rendered Ineffective through contamination by contact with dirt and certain commonly used chemicals Including plasticizers. It should also be noted that any printing or screening placed on top of the magnetic stripe must not impair the function of the magnetic stripe.
5.2 Magnetic stripe area warpage
Application of a 2,2 N (0.5 lbf) load evenly distributed on the front face opposite the magnetic stripe shall bring the entire stripe within 0.08 mm (0.003 in) of the rigid plate.
6,3 AdhesIon of stripe to card
The stripe shall not separate from the card under normal use.
6.4 Wear of magnetic stripe from read/write head
Average signal amplitude (VA) and individual signal amplitude (U,) are measured before and after 2 000 wear cycles and shall result In:
(IA ttgr 0,60 UA before and U, after 0,80 Ui, after
6.5 ResIstance to chemicals
Average signal amplitude (VA) and individual signal amplitude (U1) are measured before and after short-term exposure as defined in 150/IEC 10373-1 and shall result in:
Ui, after 0,90 VA before and U1 arter 0,90 Ui, alter
Average signal amplitude (Ui,) and individual signal amplitude (Ui) are measured before and after long- term exposure [24 h) to acid and alkaline artificial perspiration, as defined in lSO/IEC 10373-1.
UA alter  0,913 VA before and U1,1  0,90 VA alter
7 Performance characteristics for the magnetic material
7.1 General
The purpose of this clause is to enable magnetic interchangeability between card and processing systems. Media coercivity is not specified. The media’s performance criteria, regardless of coercivity. is specified in Z3.
This method uses a reference card whose material Is traceable to the primary standard (see Clause 3). All signal amplitude results from the use of the secondary reference card must be corrected by the factor supplied with the secondary reference card. Test methods given in ISO/IEC 10373-2 shall be used.
7.2 Testing and operating environment
The testing environment For signal amplitude measurements Is 23 ‘C t 3 ‘C (73 ‘F t 5 DJ) and 40 % to 60% relative humidity. When tested under otherwise identical conditions, the average signal amplitude measured at 8 ft/mm (200 ftpi) shall not deviate from its value in the above test environment by more than 15 % after 5 mm exposure over the following operating environment range:
temperature —35°C to 50 ‘C (—31 °F to 122 ‘F)
relative humIdity 5 % to 95 %
7.3 Signal amplitude requirements for magnetic media
The requirements for recording characteristics of the card are shown in Tabiel and Figure6. The media’s performance requirements specified in 7.3 shall be met in order to achieve improved resistance to erasure, and to enable magnetic interchange between card and processing systems. The properties in are Intended as guidelines for magnetic material. AnxteC is Informative and shall not be used as performance criteria for cards.
11.2 ParIty
A parity bit for each encoded character shall be used. The value of the parity bit is defined such that the total quantity oF one bits recorded, for each character, including the parity bit, shall be odd.
11.3 LongitudInal redundancy check (LRC)
The longitudinal redundancy check (LRC) character shall appear for each data track. The L.RC character shall be encoded so that it immediately follows the end sentinel when the card is read in a direction giving the start sentinel first, followed by data and the end sentinel. The bit configuration of the LRC character shall be identical to the bit configuration of the data characters.
The LRC character shall be calculated using the following procedure:
The value of each bit in the LRC character, excluding the parity bit, is defined such that the total count of one bits encoded in the corresponding lit location of all characters of the data track, including the start sentinel, data, end sentinel, and LRC characters, shall be even.
The LRC characters parity bit Is not a parity bit for the individual parity bits of the data track, but Is only the parity bit for the LRC character encoded as described In 112.
12 Location of encoded tracks
Each encoded track shall be located between the two lines as shown in Ftgure 12. The start of encoding is located at the centreline of the first one bit in the start sentinel. The end of encoding is located at the centreline of the last bit in the longitudinal redundancy check character (the last bit is the parity bit).