MagTek InSpec 9000-2005 - Manual (Page 32)

InSpec 9000-2005 Encoded Card Tester
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Figure 3-8. Bit Size
Sub. Int.
The Sub Int., or subinterval, is simply the distance of the bit cell divided by two. The ISO
standard abbreviates the subinterval as Sin and calls it Subinterval Spacing Variation.
Adj. Sub.
The Adj. Sub., or adjacent subinterval, is the distance between a subinterval transition and the
previous subinterval. The ISO abbreviates the adjacent subinterval as Sin + 1 and calls it
Adjacent Subinterval Spacing Variation.
Start Sent.
Start Sentinel, is the distance from the leading edge of the card to the first subinterval flux
transition (the first one bit) encountered for each track.