MagTek InSpec 9000-2005 - Manual (Page 81)

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APPENDIX D. 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 bit is 420
ftpi.
Bpmm
Bits per millimeter - 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.