Double-Digit Keying

Pressing two number keys in rapid succession to access a page in a videotex system. The first number accesses an intermediate index (see Intermediate Page) which in turn accesses the page. See also Single-Digit Keying.

Dumb Terminal

Terminals that do not contain an intelligent microprocessor and usually send data one character at a time.

Duplex Transmission

Independent, simultaneous, two-way transmission.

E

EBCDIC

Extended Binary Coded Decimal Interchange Code. An eight bit code used primarily by IBM equipment.

Echo

The re-transmission of characters received by either the modem or remote system back to the DTE.

Echoplex

Method of verification of transmitted data by echoing the characters transmitted back to the source device for verification. Echoplex is sometimes called remote echo and, erroneously, half- duplex.

EEPROM

Electronically Erasable Programmable Read Only Memory.

EIA

Electronic Industries Association. Organisation in the USA that sets standards for the functional characteristics of electronic interfaces.

Electronic Mail

A means by which users of a particular bulletin board or videotex system can send messages to other users of that system. Some dial-up services deal exclusively with providing electronic mail facilities.

E-MAIL

See Electronic Mail.

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Telenetics 56 manual Ebcdic, Eeprom, Eia, Mail