US Robotics COURIER User Manual page 187

COURIER HIGH SPEED MODEMS
the slow, or back channel (450 bps). The modems dynamically
reverse the channels during a call if the volume of data transfer
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Asynchronous Transmission
Data transmission in which the length of time between
transmitted characters may vary.
Because the time lapses between transmitted characters are not
uniform, the receiving modem must be signaled as to when the
data bits of a character begin and when they end. The addition
of Start and Stop bits to each character serves this purpose.
Auto Answer
A feature in modems enabling them to answer incoming calls
over the phone lines without the use of a telephone receiver.
Auto Dial
A feature in modems enabling them to dial phone numbers over
the phone system without the use of a telephone transmitter.
Baud Rate
The number of discrete signal events per second occurring on a
communications channel. Although not technically accurate,
baud rate is commonly used to mean bit rate.
Bisync
Binary Synchronous Control. An earlier protocol developed by
IBM for software applications and communicating devices
operating in synchronous environments. The protocol defines
operations at the link level of communications, for example, the
format of data frames exchanged between modems over a phone
line. See Protocol, HDLC, SDLC.
Binary Digit
A 0or1, reflecting the use of a binary numbering system (only
two digits). Used because the computer recognizes either of two
states, OFF or ON. Shortened form of binary digit is bit.
Bit Rate
The number of binary digits, or bits, transmitted per second
(bps). Communications channels using telephone channel
G-2 Glossary
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