filter device


filter device
A piece of hardware which goes between the modem and the phone line of a BBS or mainframe. When a user calls up, they will either have a voice or computer connection that asks them for a special password before they can gain access to the main computer system. This makes it more difficult for hackers to get into the system, but makes more of a burden for the legitimate users.

Dictionary of telecommunications. . 2000.

Look at other dictionaries:

  • Filter — may refer to: Chemistry, engineering and materials In chemistry, engineering, or household usage, a device to separate mixtures. See: * Filter (chemistry) * Water filter * Air filter * Oil filter * Pneumatic filter Optics and photography In… …   Wikipedia

  • filter — [fil′tər] n. [ME filtre < OFr < ML filtrum, feltrum, felt, fulled wool (used for straining liquors) < Gmc: see FELT1] 1. a device for separating solid particles, impurities, etc. from a liquid or gas by passing it through a porous… …   English World dictionary

  • Filter — Fil ter, n. [F. filtre, the same word as feutre felt, LL. filtrum, feltrum, felt, fulled wool, this being used for straining liquors. See {Feuter}.] Any porous substance, as cloth, paper, sand, or charcoal, through which water or other liquid may …   The Collaborative International Dictionary of English

  • Filter bed — Filter Fil ter, n. [F. filtre, the same word as feutre felt, LL. filtrum, feltrum, felt, fulled wool, this being used for straining liquors. See {Feuter}.] Any porous substance, as cloth, paper, sand, or charcoal, through which water or other… …   The Collaborative International Dictionary of English

  • Filter gallery — Filter Fil ter, n. [F. filtre, the same word as feutre felt, LL. filtrum, feltrum, felt, fulled wool, this being used for straining liquors. See {Feuter}.] Any porous substance, as cloth, paper, sand, or charcoal, through which water or other… …   The Collaborative International Dictionary of English

  • filter — ► NOUN 1) a porous device for removing solid particles from a liquid or gas passed through it. 2) a screen, plate, or layer which absorbs some of the light passing through it. 3) Brit. an arrangement at a junction whereby vehicles may turn while… …   English terms dictionary

  • filter tip — filter tips N COUNT A filter tip is a small device at the end of a cigarette that reduces the amount of dangerous substances that pass into the smoker s body. Filter tips are cigarettes that are manufactured with these devices …   English dictionary

  • filter —    Device that transmits a certain range of frequencies while suppressing unwanted frequencies or noise, or separating channels in communications circuits …   IT glossary of terms, acronyms and abbreviations

  • filter — 1. A porous substance through which a liquid or gas is passed in order to separate it from contained particulate matter or impurities to sterilize. SYN: filtrum. 2. To use or to subject to the action of a f.. 3. In diagno …   Medical dictionary

  • Filter driver — A filter driver is a Microsoft Windows driver that adds value to peripheral devices or supports a specialized device in the personal computer. It is driver/program/module that is inserted into the existing driver stack to perform some specific… …   Wikipedia

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