Apple Express Fax/Modem - Manual (Page 170)

digit (1) One of the characters, 0 through 9, used to express numbers in
decimal form. (2) One of the characters used to express numbers in some
other form, such as 0 and 1 in binary or 0 through 9 and A through F in
hexadecimal.
digital data Information represented by a code consisting of a sequence of
discrete elements. Compare with analog data.
digital signal A discrete or discontinuous signal; one whose various states are
discrete intervals apart. Compare with analog transmission.
digital-to-analog converter A device that converts data from digital to analog
form.
dithering A process for improving the resolution of displayed images.
DTE An abbreviation for Data Terminal Equipment. A device like your
computer that stores, displays, and processes data received from another
computer.
duplex transmission Two-way transmission.
E
echo To send a signal back to the originating device for display or
verification.
error code A number or other symbol representing a type of error.
error control A process that breaks down data into blocks, and then calculates
a checksum. The data is transmitted with the checksum so that the remote
computer can verify data integrity.
error message A message displayed or printed to notify the user of an error or
problem in the execution of a program.
even parity Use of an extra bit set to 0 or 1 as necessary to make an even
number of 1 bits in a character. For example, the 7-bit ASCII code for the
letter A (1000001) has two 1 bits; for even parity, the transmitting device
appends an eighth bit equal to 0 so that the total number of 1 bits remains
even (01000001). The receiving device can count the bits as a way of checking
for transmission errors.
158 G L O S S A R Y