Magtek InSpec 9000 Manuel d'utilisateur télécharger pdf (Page 71)

APPENDIX B. GLOSSARY

Adjacent Bit Cell Variation

See "Jitter"

American National Standards Institute (ANSI)

The United States national standards organization. ANSI also serves as member body to

the International Standards Organization (ISO).

BBJ

See "Jitter"

Bit-to-Bit Jitter

See "Jitter"

Bpi

Bits per inch - a measure of the number of bits (bit-cells) per inch on the magnetic stripe

track. This parameter is not the same as ftpi since, for example, ISO Track 1 possesses

210 bpi encoding density. The number of flux transitions per inch for ONE bits is 420

ftpi.

Bpmm

Bits per millimeter - a measure of the number of bits (bit-cells) per millimeter on the

magnetic stripe track. This parameter is not the same as ftpmm since, for example, ISO

Track 1 possesses 8.27 bpmm encoding density. The number of flux transitions per

millimeter for ONE bits is 16.54 ftpmm.

Character code

The information to be recorded or encoded on the magnetic stripe are a series of

characters (for Track 1, alphabet characters and numerals are accommodated where as on

Track 2 & 3 only numerals are permitted). These characters are reduced to ONES and

ZERO bits by the track's character code. For Track 1, a 7-bit code is defined (6 data bits

and one parity bit) For Track 2 & 3 a 5-bit code is defined (4 data bits and one parity bit).

The specific codes for each character can be found in ISO/IEC 7811-2.

Clock transition

A flux transition marking a bit-cell boundary.

Coercivity

A measure of magnetic field strength necessary to effect a change in the magnetic field

direction of the magnetic material.

1 2 ... 66 67 68 69 70 71 72 73 74 75 76 ... 89 90

Pas de commentaire

Magtek InSpec 9000 Manuel d'utilisateur Page 71