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Glossary
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Bit rate
The speed at which bits are transmitted, usually expressed as bits per second (BPS).
Block
Group of characters treated as a unit for the purpose of data transmission.
BPS
An acronym for Bits Per Second. Transmission rate of binary numbers. Compare with Baud.
Break
A special, non-data signal used by computer equipment to interrupt some processes.
Buffer
Temporary storage area used to compensate for a difference in the rate of data flow into and out
of a device.
Bulletin Board
A generic term covering a wide variety of on line information services. Many bulletin boards are
open to the public, run at no cost to users and provide the ability to download public domain
software and exchange electronic mail.
Byte
A grouping of bits to specify a single character usually consisting of eight consecutive bits. See
also Bit.
C
Carrier signal
An analog signal of known specifications, such as level and frequency, which is modulated by
another signal containing information to be transmitted. This is the high-pitched sound you can
hear when you first connect to a remote system.
Carrier Detect
An RS-232 interface signal from the modem to a terminal or personal computer indicating that
the modem is receiving a signal from a remote modem. See also DCD.
Channel
An electronic communications path. A voice grade channel generally ranges from 300 to 4000
Hz.
Character
A letter, number or other symbol contained in a message or used in a control function. See Byte.