Phone Call Recorder

jack plug

A jack plug (UK) is an extremely common audio connector. The terms phone plug (U.S.), and phone jack for the corresponding socket or jack, are also used for these connectors, especially for the original 1/4" size. Note that this is in contrast to the terms phono plug and phono jack which normally refer to RCA connectors. Phone plugs were originally used in telephone switchboards and should not be confused with the registered jack-series plugs used to connect telephones to wall outlets. See also: TRS connector. Modern jack plugs are available in three standard sizes. The original 6.35 mm or 1/4" version, dates from 1878, for use in manual telephone exchanges-making it possibly the oldest electrical connector standard still in use. The 3.5 mm or miniature and 2.5 mm or subminiature sizes were originally designed as two-conductor connectors for earpieces on transistor radios. The 3.5 mm and 2.5 mm sizes are also referred to as 1/8" and 3/32" respectively in the United States. All three sizes are now readily available in two-conductor (mono) and three-conductor (stereo or tip ring sleeve) versions. Four and five conductor versions of the 3.5 mm plug are used for certain applications. A four conductor version is becoming a de facto standard output connector for compact camcorders, providing stereo sound plus a video signal. This interface is also seen on some laptop computers. Proprietary interfaces using both four and five conductor versions exist, notably the audio connector on the iPod MP3 player, where the extra conductors are used to supply power for accessories. There is also an optical connector used for TOSLINK (mainly on things like portable equipment, hi-fi separates and similar tend to use the standard square connector) that is the same size as a 3.5mm jack. Sockets exist that can make either an optical connection to such a plug or an electrical connection to a stereo jack. Both two-conductor and three-conductor versions of the three standard sizes are readily available in male (plug) and female (socket or simply "jack") line versions, and panel-mounting female versions. Panel-mounting male versions of these also exist but are rare, as they are vulnerable to mechanical damage and therefore unreliable. Female line versions are also notoriously unreliable and are avoided by many users. The most common arrangement remains to have the male plug on the cable, and the female socket mounted in a piece of equipment, which was the original intention of the design. A considerable variety of line plugs and panel sockets is available, including plugs suiting various cable sizes, right angle plugs, and both plugs and sockets in a variety of price ranges and with current capacities up to about 15 amperes for the 1/4" version. Non-standard sizes, both diameters and lengths, are also available from some manufacturers, and are used when it is desired to restrict the availability of matching connectors. An obsolete six conductor, two pin jack plugSeveral obsolete versions of the 1/4" jack plug exist, including: A two-pin version, consisting of two mono 6.3 mm jack plugs at a centre spacing of 1". The socket versions of these can be used with normal jack plugs provided the plug bodies are not too large, but the plug version will only mate with two jack sockets at 1" centre spacing, or with line sockets, again with sufficiently small bodies. These connectors were commonly used on early stereo tape recorders. A similar type of 1/8" connector is often used in the armrests of aircraft, as part of the on-board entertainment system. It is intended to frustrate flyers from using personal headphones on planes, and encourage rental of proprietary airline headphones. Plugging a stereo plug into one of the two mono jacks typically results in the audio coming into only one ear. Adaptors are available. A short-barrelled version, once used on high-impedance mono headphones, and in particular those used in World War Two aircraft. It is physically possible to use a normal plug in a short socket, but a short plug will neither lock into a normal socket nor complete the tip circuit. These are still manufactured but are now regarded as a non-standard size.

List of telephony terms:

3gpp - a-law - abbreviated dialing - adsl - ani - answering machine - apn - automatic ring back - b-channel - baud - bell 202 modem - bit rate - bonding - bri - busy signal - cable modem - call-progress tones - call accounting - call capture - call forwarding - call originator - call park - call pick-up - call transfer - call waiting - call waiting deluxe - called party - caller id - caller id spoofing - calling party - carrier wave - cbr - ccitt - cdma - cdma2000 - cellular repeater - celp - channel - clec - clock rate - codec - collect call - conference - conference call - crc - csd - d-channel - data compression - device driver - dial-up - dial - dial tone - direct-inward-dialing - direct distance dialing - distinctive ring - dnis - dsl - dsp - dtmf - dtr - duplex - echo cancellation - edge - extension - fax - fcc - fdma - fidonet - follow-me - g.711 - g.723.1 - g.723 - g.726 - g.lite - gprs - gps - gsm - h.323 - harmonic - headphones - hscsd - hspda - iad - idsn - internet call waiting - isp - ivr - jack plug - local loop - long distance - microcontroller - mobile phone - modem - modulation - mu-law - music-on-hold - night service - off-hook - on-hook - pabx - pager - payphone - pbx - pcm - pots - prank call - precise tone plan - pstn - pulse dialling - push to talk - ring modulation - ring tone - ringback - ringing signal - rj11 - roaming - serial communications - serial port - signal noise - sim - simplex - sit - sms - softmodem - switchboard operator - tapi - tdma - telecommunications - telemarketing - telephone - telephone call - telephone card - telephone company - telephone exchange - telephone line - telephone number - telephone numbering plan - telephone operator - telephone switchboard - telephony - tts - twisted pair - umts - v.32 - v.32bis - v.34 - v.42bis - vbr - vertical service code - voicemail - voip - vox - wap - wav - wi-fi - wimax - wire