3Com Courier, Reference

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G
LOSSARY
16550 UART The fastest type of UART that is currently available.
Adaptive Speed
Leveling (ASL)
Courier V.Everything V.32 bis and V.3 terbo modems detect improved
line conditions and shift upward again to the next higher speed. The
modems at both ends of the connection adapt independently, eac
detecting and adjusting to line conditions. ASL keeps the modems
online, always operating at the highest possible speed, and constantly
ensuring data integrity.
analogue signals Continuous, varying waveforms such as the voice tones carried over
phone lines. Contrast with digital signals.
answer mode A state in which the modem transmits at the predefined high frequency
of the communications channel and receives at the low frequency. The
transmit/receive frequencies are the reverse of the calling modem which
is in originate mode
application
(application program)
A computer program designed to perform a specific function, such as a
word processor or a spreadsheet.
ARQ See Automatic Repeat Request.
ASCII American Standard Code for Information Interchange. A 7-bit binary
code (0's, 1's) used to represent letters, numbers, and special characters
such as $,!, and /. Supported by almost every computer and terminal
manufacturer.
ASL See Adaptive Speed Leveling.
asymmetrical
modulation
A transmission technique that splits the communications channel int
one high speed channel and one slower channel. During a call under
asymmetrical modulation, the modem with the greatest amount of data
to transmit is allocated the high speed channel. The modem with less
data is allocated the slow, or back channel (450 bps). The modems