GLOSSARY115duplexIndicates a communications channel capable ofcarrying signals in both directions. See halfduplex, full duplex.Electronic Industries Association (EIA)Group which defines electronic standards inthe U.S.error controlVarious techniques that check the reliability ofcharacters (parity) or blocks of data. V.42and MNP error-control protocols use errordetection (CRC) and retransmission of flawedframes (ARQ).facsimileA method for transmitting the image on a pagefrom one point to another. Commonly referredto as fax.fax modeThe mode used by a modem to send andreceive data in facsimile format. Seedefinitions for V.17, V.27ter, V.29.flow controlA mechanism that compensates for differencesin the flow of data into and out of a modem orother device. See commands &Hn, &In, &Rn.frameA data communications term for a block ofdata with header and trailer informationattached. The added information usuallyincludes a frame number, block size data,error-check codes, and Start/End indicators.
