This standard specifies the characteristics, encoding technology and coded character set of the magnetic stripe (including any protective coating) on ​​identification cards. This magnetic record is intended for machine reading. GB/T 15120.2-1994 Identification card recording technology Part 2: Magnetic stripe GB/T15120.2-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Identification cards
Recording technique
Part 2: Magnetic stripe
GB/T 1512Q. 2--94
ISO 7811/2-1985
This standard is equivalent to the international standard ISO7811/2--1985 "Identification cards recording technology Part 2: Magnetic stripe". 0 Introduction
This standard is one of a series of standards that describe the parameters of the identification cards defined in Chapter 3 below and the identification cards used in international exchange 7 Subject content and scope of application
This standard specifies the characteristics, encoding technology and coded character set of the magnetic stripe (including any protective coating) on ​​identification cards. This magnetic recording is intended for machine reading.
2 Referenced standards
GB/T14916 Physical characteristics of identification cards
GB/T15120.4 Recording technology of identification cards Part 4: Position of track 1 and track 2 of read-only tracks GB/T15120.5 Recording technology of identification cards Part 5: Position of track 3 of read-write tracks 3 Terminology
The term "identification card" given in GB/T14916 and the following terms apply to this standard. 3.1 Primary standard
NBS primary standard tape (computer amplitude reference) stored in the storage cabinet of the National Bureau of Standards (NBS) of the United States. Note: The NBS certificate provided with the tape gives the relationship (correction factor) between the primary standard and the reference tape SRM3200. 3.2 Reference card”) The reference card, which is used as the reference card for the secondary standard, is an identification card consisting of a magnetic stripe that conforms to the secondary standard magnetic tape (computer amplitude reference) SRM3200.
Note: First calibrate the secondary reference card to the primary standard using the correction factor provided by the supplier, and then calculate the position of the window (see Figure 5). 1) These cards can be ordered from the German Institute for Physical Technology. 3.3 Flux transition flux transition
The position of the maximum flux component perpendicular to the surface of the magnetic stripe. 3.4 Reference current reference current (Ik) The minimum recording current amplitude (square wave) produced on the reference card when the read voltage amplitude is equal to 80% of the maximum amplitude with a density of 8ftpmm (flux transition per millimeter) under given test conditions (see Figure 5). 3.5 Test recording currents test recording currents Two test recording currents (square waves) at 350% and 500% of the reference current (1R) should be used. Approved by the State Administration of Technical Supervision on July 16, 1994 and implemented on March 1, 1995
GB/T 15120.2-94
3.6 Average signal amplitudeaverage signal amplitudeThe average value of the peak-to-peak value of the read voltage measured in the entire recording area of ​​the card when recording with the test recording current at the specified recording density.
3.7 Reference signal amplituderefecnc signalamplitudeThe maximum average signal amplitude of the reference card corrected to the master standard. 3.8 Individual signal amplitudeindividual signal amplitudeThe peak-to-peak amplitude of a single read voltage signal. 3.9 Test densitytest density
The densities that can be used for testing are 8ftpmm and 20ftpmm. Note: When testing with a reference card, the densities that can be used are 6ftpmm and 16.6「tpmm. The relevant factors are: amplitude at 6 ftpmm,
×100=100%
amplitude at 8 ftpmm
16. Amplitude at 6 ftpmm×100-105%20 Amplitude under ftpmm
4 Physical characteristics of identification cards
Identification cards should comply with the specifications given in GB/T14916 Note: Issuers are reminded that the information retained on the magnetic stripe may be invalidated by contamination, which is caused by contact with dirt and some commonly used chemicals (including plasticizers). In addition, exposure of the card to strong magnetic fields is also prone to destroying recorded data. 5 Physical characteristics of magnetic materials
5.1 Thickness
When probing along the contour on the reading surface on the back of the card with a probe with a radius of 0.38mm to 2.54mm, the height of the reading surface should be a minimum of omm and a maximum of 0.038mm.
5.2 Surface roughness
If measured using a cut-off wavelength of 0.25mm or 0.76mm and a probe with a maximum radius of 2.54μm, the average surface irregularity of the magnetic surface should not exceed 0.404um centerline average (CLA) in both the longitudinal and transverse directions. 5.3 Surface profile
The average profile of the minimum magnetic stripe width (see Figures 1 and 2) expressed as the vertical deviation from the straight line connecting the minimum magnetic stripe width when measured with a probe of radius 0.38 mm to 2.54 mm parallel to the height of the card shall not exceed 3.8 μm for each 2.54 mm of magnetic stripe width (see Figure 3).
During the measurement, the back side of the card (magnetic stripe side) shall be kept halfway to the surface by applying a force of 2.2 N uniformly on the back side of the measurement area. Note: ① The peak in the profile caused by "blowout" during hot lamination is not part of the magnetic stripe and it should not extend beyond the intended magnetic stripe side (see Figure 4). ②It is recommended not to place magnetic material on top of the printing. When edge bleeding occurs (ink covers the coating seal), the card is more susceptible to damage and deformation.
③In order to ensure uniformity, it is necessary to specify a method for determining the surface profile. The current test method is under evaluation and the agreed procedure will be added to this standard as soon as possible.
5.4 Bonding of magnetic stripe to identification card
Under normal use the magnetic stripe shall not become detached from the card. 20
GB/T15120.2-94
Nearest parallel edge
Magnetic stripe area
Figure 1 Location of magnetic material for tracks 1 and 2 on ID-1 type cards onlyNearest long row edge
2.92mm:
Figure 2 Location of magnetic material for tracks 1, 2 and 3 on ID-1 type cards Note: These dimensions describe the maximum and minimum distances from the nearest parallel edge, but do not exclude the possibility that the magnetic material area covers a larger area than indicated. 21
In the figure: a≤3.8(254)
Where: a -- vertical deviation, μm;
GB/T15120.2---94
Magnetic material
Figure 3 Surface profile
e Minimum magnetic stripe width, 6.35mm (for the 1st and 2nd tracks) or 10.28mm (for the 1st, 2nd and 3rd tracks). Allowable
6 Performance characteristics of magnetic materials for newly manufactured identification cards 6.1 General
Figure 4 Predetermined magnetic stripe surface
Not allowed
This method uses a certified reference card whose magnetic material is based on the master standard tape. This test does not guarantee any minimum or maximum value of the intrinsic coercive force (H.). The specification of this parameter (if necessary) is left to the individual card purchaser. In general, greater coercivity provides greater resistance to erasure and therefore increases cost. 6.2 All measurements shall be made on tracks 1, 2, and 3 (read-only or read-write) using the same equipment and under the same conditions. 6.2.1 Signal Amplitude
The signal amplitude shall be between 80% and 130% of the reference signal amplitude (see Figure 5) when recorded at 8 ftpmm using the test recording current (see 3.5) in appropriate locations on magnetic material with any protective coating. The signal amplitude obtained at this density after recording with a test recording current of 500% of IR shall not exceed the signal amplitude obtained when recorded at the same density using a recording current of 350% of 1. The slope of the magnetic saturation curve between these two points shall never be positive. The signal amplitude shall not be less than 70% of the signal amplitude obtained at 8 ftpmm when recorded at 20 ftpmm using the same test recording current (see 3.5) and with all other parameters the same. That is: Amplitude at 20 ftpmm
×100%=70%
Amplitude at 8 ftpmm
Note: If the resolution is specified as follows, the resolution of the read head subsystem (head amplifier) ​​should be within the range of 90% to 100%: Amplitude at 20 ftpmm
Amplitude at 8 ftpmm
6.2.2 Erase
X100%= 90%- 100%bzxZ.net
GB/T15120.2--94
Magnetic materials shall be capable of being erased by a direct current (DC) write current equal to 350% of IR (with a deviation of 3%) or less than the base signal amplitude.
Reference signal amplitude
Recording current after fractionation
Small example length
Reference curve calibrated to standard
Figure 58Magnetic saturation curve and tolerance zone of the reference card at ftpmm Note: The calibrated reference curve depicted above may not meet the specifications given in 6.2. This curve specifies the main standard response curve (on the card). Specify the window parameters to produce a card that is effective in a machine-readable environment. 6.3 Test and Operating Environment
The test environment for signal amplitude measurement is 23 ± 3 °C and relative humidity 40% to 60%. When measured under otherwise identical conditions, the signal amplitude from the magnetic stripe after exposure for 5 min in an operating environment ranging from -35 to ~50 °C and relative humidity 5% to 95% (maximum wet bulb temperature 25 °C) shall not deviate by more than 15% from its value under the above test environment.
6.4 Test Specifications
The read head used shall have a gap of 0.025 mm or less. When making the above measurements, the signal amplitude shall be measured after the encoding has stabilized. If all measurements are made under the same test conditions (i.e. the same number of passes before the head gap), the stability criteria are met. 7 Coding Techniques
The coding technique is commonly known as dual frequency phase coherent recording. This method allows serial recording of self-timed data on each track (see Figure 6).
The data consists of data bits and timing bits together. The flux reversal generated between the two clocks is recorded as "1", and no flux reversal is recorded as "0". Data is recorded in the synchronous sequence of characters without inserting gaps. Recording should be carried out in the magnetic saturation state where the magnetization direction is parallel to a straight line on the track plane. The direction is determined by the recording angle. 23
8 General provisions of encoding specifications
8.1 Recording angle
GB/T15120.2-94
Figure 6 Example of dual-frequency phase coherent encoding|| tt||tSelf-timing time gap
The recording angle should be perpendicular to the nearest edge of the card parallel to the magnetic stripe, and it can have the following deviations: ±20° for the read-only track (track 1) with a bit density of 8.3bpmm; ±20° for the read-only track (track 2) with a bit density of 3bpmm; ±20° for the read-write track (track 3) with a bit density of 8.3bpmm. When the read signal amplitude is maximum, the recording angle (α) is determined by measuring the head gap angle (see Figure 7). 1 200
Card front
Card back
Figure 7 Recording angle
8.2 Bit structure
The bit structure of each character in the magnetic area is that the least significant bit (b.) is encoded first, and the parity bit is encoded last. 8.3 Recording direction
Should face the magnetic stripe and start encoding from the rightmost side of the magnetic stripe. 8.4 Timing bit
The timing bit (0) shall be recorded from the first data bit input, and the interval from the last data bit to the end of the recording shall also be recorded with the timing bit (see note).
Note: It should be recognized that when viewed from the back of the card, the \0\ between 2.9mm from the right to the right or 82.55mm from the right to the left may not meet the requirements here2.4
GB/T 15120.2
The specifications given; however, only "0" will be encoded in this area. 9 Encoding specifications for read-only magnetic tracks
In addition to the relevant parts of Chapter 8, the following specifications also apply to read-only tracks Track 1
9.1 Alphanumeric tracks
9.1.1 Bit density
The nominal bit density of the recorded signal shall be 8.3 bits/mm ± 5% when measured along a line parallel to the longitudinal centerline of the track. The spacing between adjacent flux reversals shall be 0.121 ± 0.006 mm (i.e. ± 5%) for a "0" and 0.06 ± 0.004 mm (i.e. ± 7%) for a "1". For a series of recorded "1's", the density is equivalent to 16.5 ftpmm (nominal). 9.1.2 Coded Character Set
The following alphanumeric code shall be used, which is a 6-bit character set with an odd check digit, as shown in Table 1. Coded Character Set for Track 1
Note: 1) These character positions are for hardware control only and do not contain information characters. 2) These character positions are reserved for additional national characters when required and are not in general use internationally. 3) This character position is reserved for optional additional graphic symbols. 4) For this application, these characters shall have the following meanings: Position 0/5% indicates "start mark".
indicates "end mark".
1/15?
indicates "separator".
9.1.3 Maximum number of characters for ID-1 card
GB/T15120.2.94
The sum of data characters, control characters and longitudinal margin check characters shall not exceed 79 characters, including the start and end marks. 9.2 Digital Tracks—Track 2
9.2.1 Bit Density
The nominal bit density of the recorded signal shall be 3 bits/mm±3% when measured along a line parallel to the longitudinal centerline of the track. The spacing between adjacent flux reversals shall be 0.339±0.010 mm (i.e., ±3%) for "0" and 0.169±0.007 mm (i.e., ±4%) for "1". For a string of recorded 1's, the density is equivalent to 6.0ftpmm (nominal). 9.2.2 Coded character set
This numeric-only character code shall be a 4-bit binary-decimal (BCD) code with an odd parity bit (P), as shown in Table 2. Table 2 Coded character set characters for tracks 2 and 3
Note: 1) These character positions are for hardware control only and do not contain information characters (data content). 2) Start mark (start character).
3) Delimiter.
4) End mark (end character).
9.2.3 Maximum number of characters for ID-1 card
|The data characters, control characters and longitudinal check characters together shall not exceed 40 characters, including the start and end marks. 10 Coding specifications for read-write track 3
In addition to the relevant parts of Chapter 8, the following specifications also apply to read-write track 3. 10.1 Bit density
When measured along a straight line parallel to the longitudinal centerline of the track, the nominal bit density of the recorded signal shall be 8.3 bits/mm±8%. The spacing between adjacent flux reversals shall be 0.121±0.010mm (i.e. ±8%) for 0" and 0.0600.006mm (i.e. ±10%) for \1\. For a string of recorded "1", the density is equivalent to 16.5ftpmm (nominal). 26
10.2 Coded character set
GB/T 15120.2-94
The digital coded character set in Section 9.2.2 should be used. 10.3 Maximum number of characters for ID-1 card
The data characters, control characters and longitudinal check characters should not exceed 107 characters together, including the start and end marks.
11 Error detection
The two error detection techniques described below should be encoded. In both techniques, the recorded timing bits are used for synchronization and should not be data characters.
11.1 Parity check
A parity bit should be used for each coded character. The value of the parity bit is defined as: the total number of "1" recorded in a character (including the parity bit) should be an odd number.
11.2 Longitudinal Redundancy Check (LRC)
Each data message shall have a Longitudinal Redundancy Check (LRC) character. The LRC character shall be coded so that when the card is read in the order of start mark, data, and end mark, the LRC character immediately follows the end mark. The bit structure of the LRC character shall be the same as the bit structure of the data characters.
The LRC character shall be calculated using the following steps:
The value of each bit in the LRC character (excluding the parity bit) is defined so that the total number of bits encoded as "1" in the corresponding bit position of all characters in the data message (including the start mark, data, end mark, and LRC character) is an even number. The parity bit of the LRC character is not a parity bit for the individual parity bits of the corresponding data message, but is only a parity bit for the corresponding parity bits of the data message according to 11.1. The parity check bit used for the encoded LRC characters described in Article 1. Additional Notes:
This standard is proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the Electronic Standardization Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Electronic Standardization Institute of the Ministry of Machinery and Electronics Industry and the Financial Technology Department of the People's Bank of China. The main drafters of this standard are Shao Jian, Huang Jiaying, Wang Yunsheng, Liu Zhong, and Hong Shu. From the date of implementation of this standard, the former Ministry of Electronics Industry of the People's Republic of China Standard SJ/Z9026.2-87 "Identification Cards-Recording Technology-Part 2: Magnetic Stripe" will be abolished. 27
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