3Com 56K manual Glossary

GLOSSARY 5

data mode The mode in which the fax modem is capable of sending and receiving data files. A standard modem without fax capabilities is always in Data mode.

data set Another way of saying "modem."

data terminal The device that generates or is the final destination of data. equipment (DTE)

DCE See data communication equipment.

default Any setting assumed, at startup or reset, by the computer's soft-ware and attached devices, and operational until changed by the user.

digital loopback A test that checks the modem's EIA-232 interface and the cable that connects the terminal or computer and the modem. The modem receives data (in the form of digital signals) from the computer or terminal, and immediately returns the data to the screen for verification.

digital signals Discrete, uniform signals. In this manual, the term refers to the binary digits 0 and 1.

DSR See data set ready.

DTE See Data Terminal Equipment.

duplex Indicates a communications channel capable of carrying signals in both directions. See Half Duplex, Full Duplex.

echo See local echo.

EIA Electronic Industries Association, which defines electronic standards in the U.S.

EIA-232A technical specification published by the Electronic Industries Association that establishes mechanical and electrical interface requirements between computers, terminals, modems, and communication lines. EIA-232 was formerly known as RS-232.

equalization A compensation circuit designed into modems to counteract certain distortions introduced by the telephone channel. Two types are used: fixed (compromise) equalizers and those that adapt to channel conditions. 3Com high speed modems use adaptive equalization.