3Com 56K manual Glossary

GLOSSARY

16550 UART The fastest type of UART that is currently available.

Adaptive Speed Business Modem V.32 bis and V.32 terbo modems detect improved line Leveling (ASL) conditions and shift upward again to the next higher speed. The

modems at both ends of the connection adapt independently, each detecting and adjusting to line conditions. ASL keeps the modems online, always operating at the highest possible speed, and constantly ensuring data integrity.

analog 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 re-verse of the calling modem which is in originate mode.

application A computer program designed to perform a specific function, such as a (application program) 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 A transmission technique that splits the communications channel into modulation 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