67-704: TOSLINK ( Toshiba Link ) is a standardized optical fiber connector system. Generically known as optical audio , the most common use of the TOSLINK optical fiber connector is in consumer audio equipment in which the digital optical socket carries (transmits) a stream of digital audio signals from audio equipment ( CD player , DVD player , Digital Audio Tape recorder, computer, video game console ) to an AV receiver that can decode two channels of uncompressed, pulse-code modulated (PCM) audio; or decode compressed 5.1/7.1 surround sound audio signals, such as Dolby Digital and DTS . Unlike an HDMI connector cable,
134-403: A 6.35 mm ( 1 ⁄ 4 in) jack, Bantam connectors are used for mixing console and outboard patchbays in recording studio and live sound applications, where large numbers of patch points are needed in a limited space. The slightly different shape of Bantam plugs is also less likely to cause shorting as they are plugged in. A two-pin version, known to the telecom industry as
201-895: A UK NATO or European NATO connector. In the most common arrangement, consistent with the original intention of the design, the male plug is connected to a cable, and the female socket is mounted in a piece of equipment. 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 15 amperes for certain heavy-duty 1 ⁄ 4 in versions intended for loudspeaker connections. Common uses of phone plugs and their matching sockets include: Any number of 3.5 mm sockets for input and output may be found on personal computers , either from integrated sound hardware common on motherboards or from insertable sound cards . The 1999 PC System Design Guide's color code for 3.5 mm TRS sockets
268-598: A physical contact polish on the fiber and ferrule end. This is a slightly convex surface with the apex of the curve accurately centered on the fiber, so that when the connectors are mated the fiber cores come into direct contact with one another. Some manufacturers have several grades of polish quality, for example a regular FC connector may be designated FC/PC (for physical contact), while FC/SPC and FC/UPC may denote super and ultra polish qualities, respectively. Higher grades of polish give less insertion loss and lower back reflection. Many connectors are available with
335-554: A "310 connector", consists of two 1 ⁄ 4 -inch phone plugs at a centre spacing of 5 ⁄ 8 inch (16 mm). The socket versions of these can be used with normal phone plugs provided the plug bodies are not too large, but the plug version will only mate with two sockets at 5 ⁄ 8 inches centre spacing, or with line sockets, again with sufficiently small bodies. These connectors are still used today in telephone company central offices on "DSX" patch panels for DS1 circuits . A similar type of 3.5 mm connector
402-607: A 0.281 in (7.1 mm) diameter shaft with four conductors, allowing two for the headphones, and two for the microphone. Also used is the U-384/U (Nexus TP-105), which has the same diameter as the U-174/U but is slightly longer and has 5 conductors instead of 4. There is a confusingly similar four-conductor British connector, Type 671 (10H/18575), with a slightly larger diameter of 7.57 mm (0.298 in) used for headsets in many UK military aircraft and often referred to as
469-471: A FC/APC-R adapter key slot. Field-mountable optical fiber connectors are used to join optical fiber jumper cables that contain one single-mode fiber. Field-mountable optical fiber connectors are used for field restoration work and to eliminate the need to stock jumper cords of various sizes. These assemblies can be separated into two major categories: single-jointed connector assemblies and multiple-jointed connector assemblies. According to Telcordia GR-1081,
536-417: A TOSLINK connector, the optical signal appears as a red light, with a peak wavelength of 650 nm. Depending on the type of modulated signal being carried, other optical wavelengths can be present. Toshiba originally created TOSLINK to connect their CD players to the receivers they manufactured, for PCM audio streams. The data-link layer is based on the "Sony/Philips Digital Interface" ( S/PDIF ), while
603-423: A TOSLINK optical fiber connector does not possess the bandwidth capacity to carry the uncompressed audio signals of Dolby TrueHD and of DTS-HD Master Audio ; nor carry more than two channels of PCM audio. Although the TOSLINK connector supports several media formats and physical standards, the most common digital audio connectors are the rectangular EIAJ / JEITA RC-5720 (also CP-1201 and JIS C5974-1993 F05). In
670-646: A connect/disconnect capability is required. Due to the polishing and tuning procedures that may be incorporated into optical connector manufacturing, connectors are often assembled onto optical fiber in a supplier's manufacturing facility. However, the assembly and polishing operations involved can be performed in the field, for example, to terminate long runs at a patch panel . Optical fiber connectors are used in telephone exchanges , for customer premises wiring , and in outside plant applications to connect equipment and fiber-optic cables , or to cross-connect cables. Most optical fiber connectors are spring-loaded, so
737-416: A mic) are often compatible with standard TRS stereo headphones, whereby the contact that expects a mic signal will instead simply become shorted to ground and thus will provide a zero signal. Conversely, those TRRS headsets can plug into TRS sockets, in which case its speakers may still work even though its mic won't work (the mic's signal contact will be disconnected). Because of a lack of standardization in
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#1732779791447804-401: A multiple-jointed connector assembly is a connector assembly that uses the stub-fiber type of connector plug. Features of good connector design: Glass fiber optic connector performance is affected both by the connector and by the glass fiber. Concentricity tolerances affect the fiber, fiber core, and connector body. The core optical index of refraction is also subject to variations. Stress in
871-449: A non-angle polished connector causes very high insertion loss. Generally angle-polished connectors have higher insertion loss than good quality straight physical contact ones. "Ultra" quality connectors may achieve comparable back reflection to an angled connector when connected, but an angled connection maintains low back reflection even when the output end of the fiber is disconnected. Angle-polished connections are distinguished visibly by
938-572: A number of models for different purposes, including: By 1950, the two main plug designs were: Several modern designs have descended from those earlier versions: U.S. military versions of the Western Electric plugs were initially specified in Amendment No.1, MIL-P-642, and included: The 3.5 mm or miniature size was originally designed in the 1950s as two-conductor connectors for earpieces on transistor radios , and remains
1005-464: A pair of phone connectors. A standard 1 ⁄ 4 -inch (6.3 mm) 2 or 3-conductor plug, type PJ-055, is used for headphones. For the microphone, a smaller 3 ⁄ 16 -inch (0.206 inch / 5.23 mm) diameter 3-conductor plug, type PJ-068, is used. Military aircraft and civil helicopters have another type termed the U-174/U (Nexus TP-101), also known as U-93A/U (Nexus TP-102) and Nexus TP-120. These are also known as US NATO plugs. These have
1072-548: A patent in 1901 for improved construction of the telephone switchboard-plug with today's 1 ⁄ 4 inch TS form still used on audio equipment. Western Electric was the manufacturing arm of the Bell System , and thus originated or refined most of the engineering designs, including the telephone jacks and plugs which were later adopted by other industries, including the US military . By 1907, Western Electric had designed
1139-399: A receptacle designed for the shorter (15 mm) plug may damage the receptacle, and may damage any electronics located immediately behind the receptacle. However, partially inserting the plug will work as the tip/ring/ring distances are the same for both variants. A shorter plug in a socket designed for the longer connector may not be retained firmly and may result in wrong signal routing or
1206-412: A short circuit inside the equipment (e.g. the plug tip may cause the contacts inside the receptacle – tip/ring 1, etc. – to short together). The shorter 15 mm TRRS variant is more common and physically compatible with standard 3.5 mm TRS and TS connectors. Many small video cameras, laptops, recorders and other consumer devices use a 3.5 mm microphone connector for attaching a microphone to
1273-577: A shorter tip. Professional audio and the telecommunication industry use a 0.173 in (4.4 mm) diameter plug, associated with trademarked names including Bantam , TT, Tini-Telephone, and Tini-Tel. They are not compatible with standard EIA RS-453/IEC 60603-11 1 ⁄ 4 -inch jacks. In addition to a slightly smaller diameter, they have a slightly different geometry. The three-conductor TRS versions are capable of handling balanced signals and are used in professional audio installations. Though unable to handle as much power, and less reliable than
1340-425: A significant part of the overall manufacturing cost. Field testing is usually simpler. A special hand-held optical microscope is used to check for dirt or blemishes. A power meter and light source or an optical loss test set (OLTS) is used to test end-to-end loss, and an optical time-domain reflectometer may be used to identify significant point losses or return losses. TRS connector A phone connector
1407-433: A single three-conductor socket (for the front speakers) and two four-conductor sockets. This is to accommodate rear-center (6.1) or rear left and right (7.1) channels without the need for additional sockets on the sound card. Some portable computers have a combined 3.5 mm TRS/ TOSLINK jack, supporting stereo audio output using either a TRS connector or TOSLINK (stereo or 5.1 Dolby Digital / DTS ) digital output using
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#17327797914471474-429: A single-jointed connector assembly is a connector assembly where there is only one spot where two different fibers are joined together. This is the situation generally found when connector assemblies are made from factory-assembled optical fiber connector plugs. A multiple-jointed connector assembly is a connector assembly where there is more than one closely spaced connection joining different fibers together. An example of
1541-531: A standard still used today. This roughly half-sized version of the original, popularized by the Sony EFM-117J radio (released in 1964), is still commonly used in portable applications and has a length of 15 millimetres (0.59 in). The three-conductor version became very popular with its application on the Walkman in 1979, as unlike earlier transistor radios, these devices had no speaker of their own;
1608-484: A stereo input socket for a mic. The back panel may have additional sockets, most commonly for line out , mic , line in , and less commonly for multiple surround sound outs. Laptops and tablets tend to have fewer sockets than desktops due to size constraints. Some computers include a 3.5 mm TRS socket for mono microphone that delivers a 5 V bias voltage on the ring to power an electret microphone 's integrated buffer amplifier , though details depend on
1675-546: A suitable optical adapter. Most iMac computers have this digital/analog combo output feature as standard, with early MacBooks having two ports, one for analog/digital audio input and the other for output. Support for input was dropped on various later models The original application for the 6.35 mm ( 1 ⁄ 4 in) phone jack was in manual telephone exchanges. Many different configurations of these phone plugs were used, some accommodating five or more conductors, with several tip profiles. Of these many varieties, only
1742-410: A technical maximum of 10 meters , for reliable transmission without the use of a signal booster or a repeater. However, it is very common for interfaces on newer consumer electronics (satellite receivers and PCs with optical outputs) to easily run over 30 meters on even low-cost (0.82 USD/m 2009) TOSLINK cables. TOSLINK transmitters operate at a nominal optical wavelength of 650 nm . Mini-TOSLINK
1809-444: Is a family of cylindrically -shaped electrical connectors primarily for analog audio signals . Invented in the late 19th century for tele phone switchboards , the phone connector remains in use for interfacing wired audio equipment , such as head phones , speakers , micro phones , mixing consoles , and electronic musical instruments (e.g. electric guitars , keyboards , and effects units ). A male connector (a plug),
1876-515: Is a standardized optical fiber connector smaller than the standard square TOSLINK connector commonly used in larger consumer audio equipment. The plug is almost the same size and shape as the ubiquitous 3.5 mm stereo minijack . Adapters are available to connect a full-size TOSLINK plug to a mini-TOSLINK socket. Combined 3.5 mm jack and mini-TOSLINK sockets exist which can accept a 3.5 mm or mini-TOSLINK plug; mini-TOSLINK plugs and sockets are made 0.5 mm longer than electrical jack plugs so that
1943-545: Is common to simply name the connector according its number of rings: The sleeve is usually a common ground reference voltage or return current for signals in the tip and any rings . Thus, the number of transmittable signals is less than the number of contacts. The outside diameter of the sleeve is 6.35 millimetres ( 1 ⁄ 4 inch) for full-sized connectors, 3.5 mm ( 1 ⁄ 8 in) for " mini " connectors, and only 2.5 mm ( 1 ⁄ 10 in) for " sub-mini " connectors. Rings are typically
2010-451: Is common, which assigns pink for microphone , light blue for line in , and lime for line level . AC'97 and its 2004 successor Intel High Definition Audio have been widely adopted specifications that, while not mandating physical sockets, do provide specifications for a front panel connector with pin assignments for two ports with jack detection. Front panels commonly have a stereo output socket for headphones and (slightly less commonly)
2077-470: Is inserted into a hole and makes contact with that lever, the lever pivots and breaks its normal connection. The receptacle was called a jack-knife because of its resemblance to a pocket clasp-knife . This is said to be the origin of calling the receptacle a jack . Scribner filed a patent in 1880 which removes the lever and resembles the modern connector and made improvements to switchboard design in subsequent patents filed in 1882. Henry P. Clausen filed
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2144-419: Is mated into a female connector (a socket), though other terminology is used. Plugs have 2 to 5 electrical contacts . The tip contact is indented with a groove. The sleeve contact is nearest the (conductive or insulated) handle . Contacts are insulated from each other by a band of non-conductive material. Between the tip and sleeve are 0 to 3 ring contacts. Since phone connectors have many uses, it
2211-437: Is now common and may be transmitted via USB sound cards , USB headphones, Bluetooth , display connectors with integrated sound (e.g. DisplayPort and HDMI ). Digital devices may also have internal speakers and mics. Thus the phone connector is sometimes considered redundant and a waste of space, particularly on thinner mobile devices . And while low-profile surface-mount sockets waterproofed up to 1 meter exist, removing
2278-489: Is often used in the armrests of older aircraft, as part of the on-board in-flight entertainment system. Plugging a stereo plug into one of the two mono jacks typically results in the audio coming into only one ear. Adapters are available. A short-barrelled version of the phone plug was used for 20th-century high-impedance mono headphones, and in particular those used in World War II aircraft . These have become rare. It
2345-457: 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. Less commonly used 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, such as 0.210-inch (5.3 mm) inside diameter jacks for fire safety communication in public buildings. Digital audio
2412-1073: Is return loss, with grades from 1 (best) to 5 (worst). A variety of optical fiber connectors are available, but SC and LC connectors are the most common types of connectors on the market. Typical connectors are rated for 500–1,000 mating cycles. The main differences among types of connectors are dimensions and methods of mechanical coupling. Generally, organizations will standardize on one kind of connector, depending on what equipment they commonly use. In many data center applications, small (e.g., LC) and multi-fiber (e.g., MTP/MPO) connectors have replaced larger, older styles (e.g., SC), allowing more fiber ports per unit of rack space. Outside plant applications may require connectors be located underground, or on outdoor walls or utility poles. In such settings, protective enclosures are often used, and fall into two broad categories: hermetic (sealed) and free-breathing. Hermetic cases prevent entry of moisture and air but, lacking ventilation, can become hot if exposed to sunlight or other sources of heat. Free-breathing enclosures, on
2479-456: Is sometimes statistical, for example, a process check. A profiling system may be used to ensure the overall polished shape is correct, and a good quality optical microscope to check for blemishes. Insertion loss and return loss performance is checked using specific reference conditions, against a reference-standard single-mode test lead, or using an encircled flux compliant source for multi-mode testing. Testing and rejection ( yield ) may represent
2546-558: The EIAJ optical , the trade name TOSLINK is a registered trademark of the Toshiba electronics company, derived from TOShiba-LINK ; other etymologic variations were the words TOSlink , TosLink , and Tos-link . The ADAT Lightpipe (ADAT Optical) uses an optical transmission system similar to that of the TOSLINK connector used in the professional recording of music and in the audio component industry. The ADAT Lightpipe connector format uses
2613-590: The 3.5 mm plug and jack are used for certain applications. A four-conductor version is often used in compact camcorders and portable media players, providing stereo sound and composite analog video. It is also used for a combination of stereo audio, a microphone, and controlling media playback, calls, volume and/or a virtual assistant on some laptop computers and most mobile phones , and some handheld amateur radio transceivers from Yaesu . Some headphone amplifiers have used it to connect balanced stereo headphones, which require two conductors per audio channel as
2680-467: The case of MiniDisc recorders). Optical fiber connector An optical fiber connector is a device used to link optical fibers , facilitating the efficient transmission of light signals. An optical fiber connector enables quicker connection and disconnection than splicing . They come in various types like SC, LC, ST, and MTP, each designed for specific applications. In all, about 100 different types of fiber optic connectors have been introduced to
2747-474: The channels do not share a common ground. By the 1940s, broadcast radio stations were using Western Electric Code No. 103 plugs and matching jacks for patching audio throughout studios. This connector was used because of its use in AT&;T 's Long Line circuits for the distribution of audio programs over the radio networks' leased telephone lines. Because of the large amount of space these patch panels required,
TOSLINK - Misplaced Pages Continue
2814-503: The connector manufacturers' nomenclature —referred to as mini phonos . Confusion also arises because phone jack and phone plug may sometimes refer to the RJ11 and various older telephone sockets and plugs that connect wired telephones to wall outlets. The original 1 ⁄ 4 -inch (6.35 mm) version descends from as early as 1877 in Boston when the first telephone switchboard
2881-511: The connector may often simply be called a quarter-inch to distinguish it from XLR , another frequently-used audio connector. These naming variations are also used for the 3.5 mm connectors, which have been called mini-phone , mini-stereo , mini jack , etc. RCA connectors are differently-shaped, but confusingly are similarly-named as phono plugs and phono jacks (or in the UK, phono sockets). 3.5 mm connectors are sometimes—counter to
2948-428: The fiber end face polished at an angle to prevent light that reflects from the interface from traveling back up the fiber. Because of the angle, the reflected light does not stay in the fiber core but instead leaks out into the cladding. Angle-polished connectors should only be mated to other angle-polished connectors. The APC angle is normally 8 degrees, however, SC/APC also exists as 9 degrees in some countries. Mating to
3015-556: The fiber faces are pressed together when the connectors are mated. The resulting glass-to-glass or plastic-to-plastic contact eliminates signal losses that would be caused by an air gap between the joined fibers. Performance of optical fiber connectors can be quantified by insertion loss and return loss . Measurements of these parameters are now defined in IEC standard 61753-1. The standard gives five grades for insertion loss from A (best) to D (worst), and M for multimode . The other parameter
3082-401: The hardware layer utilizes a fiber optic transmission system, rather than the electrical (copper) hardware layer of S/PDIF. TOSLINK was soon adopted by manufacturers of most CD players. It can often be found on video source (DVD and Blu-ray players, cable boxes and game consoles) to connect the digital audio stream to Dolby Digital / DTS decoders. Although the generic name for the connector is
3149-505: The industry began switching to 3-conductor plugs and jacks in the late 1940s, using the WE Type 291 plug with WE type 239 jacks. The type 291 plug was used instead of the standard type 110 switchboard plug because the location of the large bulb shape on this TRS plug would have resulted in both audio signal connections being shorted together for a brief moment while the plug was being inserted and removed. The Type 291 plug avoids this by having
3216-593: The latter are too short to touch and damage the LED of a mini-TOSLINK capable socket. Many discontinued laptop computer and portable digital audio equipment models, such as the Google Chromecast Audio device, Apple AirPort Express , and iPod Hi-Fi , as well as some MiniDisc recorders, use these connectors that allow for the insertion of 3.5 mm analog (electrical) headphone output, microphone input, or mini-TOSLINK digital (optical) output (or input, in
3283-711: The manufacturer. The Apple PlainTalk microphone socket is a historical variant that accepts either a 3.5 mm line input or an elongated 3.5 mm TRS plug whose tip carries the amplifier's power. Some newer computers, especially laptops, have 3.5 mm TRRS headset sockets, which are compatible with phone headsets and may be distinguished by a headset icon instead of the usual headphones or microphone icons. These are particularly used for voice over IP . Sound cards that output 5.1 surround sound have three sockets to accommodate six channels: front left and right; surround left and right; and center and subwoofer. 6.1 and 7.1 channel sound cards from Creative Labs, however, use
3350-588: The market. These connectors include components such as ferrules and alignment sleeves for precise fiber alignment. Quality connectors lose very little light due to reflection or misalignment of the fibers. Optical fiber connectors are categorized into single-mode and multimode types based on their distinct characteristics. Industry standards ensure compatibility among different connector types and manufacturers. These connectors find applications in telecommunications , data centers , and industrial settings. Optical fiber connectors are used to join optical fibers where
3417-401: The mono plugs of the same size. The results of this physical compatibility are: Equipment aware of this possible shorting allows, for instance: Some devices for an even higher number of rings might possibly be backwards-compatible with an opposite-gendered device with fewer rings, or may cause damage. For example, 3.5 mm TRRS sockets that accept TRRS headsets (stereo headphones with
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#17327797914473484-460: The more fixed electrical connector is the jack, while the less fixed connector is the plug, without regard to the gender of the connector contacts. The Institute of Electrical and Electronics Engineers in 1975 also made a standard that was withdrawn in 1997. The intended application for a phone connector has also resulted in names such as audio jack , headphone jack , stereo plug , microphone jack , aux input , etc. Among audio engineers,
3551-702: The on-off switch and used a two-pronged connector with both the 3.5 and 2.5 mm plugs. They were also used for low-voltage DC power input from wall adapters. In the latter role, they were soon replaced by coaxial DC power connectors . 2.5 mm phone jacks have also been used as headset jacks on mobile telephones (see § Mobile devices ). The 1 ⁄ 8 in and 1 ⁄ 10 in sizes, approximately 3.5 mm and 2.5 mm respectively in mm, though those dimensions are only approximations. All sizes are now readily available in two-conductor (unbalanced mono) and three-conductor ( balanced mono or unbalanced stereo) versions. Four-conductor versions of
3618-432: The other hand, allow ventilation, but can also admit moisture, insects and airborne contaminants. Selection of the correct housing depends on the cable and connector type, the location, and environmental factors. Many types of optical connector have been developed at different times, and for different purposes. Many of them are summarized in the tables below. Modern connectors typically use
3685-414: The past regarding the dimensions (length) given to the ring conductor and the insulating portions on either side of it in 6.35 mm ( 1 ⁄ 4 in) phone connectors and the width of the conductors in different brands and generations of sockets, there are occasional issues with compatibility between differing brands of plug and socket. This can result in a contact in the socket bridging (shorting)
3752-455: The polished fiber can cause excess return loss. The fiber can slide along its length in the connector. The shape of the connector tip may be incorrectly profiled during polishing. The connector manufacturer has little control over these factors, so in-service performance may well be below the manufacturer's specification. Testing fiber optic connector assemblies falls into two general categories: factory testing and field testing. Factory testing
3819-430: The range of the TOSLINK system. Optical cables are not susceptible to electrical problems such as ground loops and RF interference . Several types of fiber can be used for TOSLINK: inexpensive 1 mm plastic optical fiber, higher-quality multistrand plastic optical fibers, or quartz glass optical fibers, depending on the desired bandwidth and application. TOSLINK cables are usually limited to 5 meters in length, with
3886-451: The right channel of the amplifier. This attempt has long been abandoned, and now the convention is that all plugs fit all sockets of the same size, regardless of whether they are balanced or unbalanced, mono or stereo. Most 6.35 mm plugs, mono or stereo, now have the profile of the original stereo plug, although a few rounded mono plugs are still produced. The profiles of stereo miniature and sub-miniature plugs have always been identical to
3953-411: The ring and sleeve contacts on a phone connector. Equipment requiring video with stereo audio input or output sometimes uses 3.5 mm TRRS connectors. Two incompatible variants exist, of 15 millimetres (0.59 in) and 17 mm (0.67 in) length, and using the wrong variant may either simply not work, or could cause physical damage. Attempting to fully insert the longer (17 mm) plug into
4020-515: The same JIS F05 connectors as the TOSLINK connector, the ADAT Lightpipe data format is incompatible with S/PDIF. Due to their high attenuation of light, the effective range of plastic optical cables is limited to 5–10 m . They can temporarily fail or be permanently damaged if tightly bent. Although less commonly available and more expensive than plastic optical fiber (POF) cables, glass or silica optical fibers have lower losses and can extend
4087-541: The same diameter as the sleeve. The 1902 International Library of Technology simply uses jack for the female and plug for the male connector. The 1989 Sound Reinforcement Handbook uses phone jack for the female and phone plug for the male connector. Robert McLeish, who worked at the BBC , uses jack or jack socket for the female and jack plug for the male connector in his 2005 book Radio Production . The American Society of Mechanical Engineers , as of 2007, says
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#17327797914474154-566: The socket entirely facilitates waterproofing . Chinese phone manufacturers were early in not using a phone socket: first with Oppo 's Finder in July 2012 (which came packaged with micro-USB headphones and supported Bluetooth headphones ), followed by Vivo 's X5Max in 2014 and LeEco in April 2016 and Lenovo 's Moto Z in September 2016. Apple 's September 2016 announcement of the iPhone 7
4221-499: The two-conductor version with a rounded tip profile was compatible between different manufacturers, and this was the design that was at first adopted for use with microphones , electric guitars, headphones , loudspeakers , and other audio equipment . When a three-conductor version of the 6.35 mm plug was introduced for use with stereo headphones, it was given a sharper tip profile to make it possible to manufacture jacks that would accept only stereo plugs, to avoid short-circuiting
4288-511: The use of a green strain relief boot, or a green connector body. The parts are typically identified by adding "/APC" (angled physical contact) to the name. For example, an angled FC connector may be designated FC/APC, or merely FCA. Non-angled versions may be denoted FC/PC or with specialized designations such as FC/UPC or FCU to denote an "ultra" quality polish on the fiber end face. Two different versions of FC/APC exist: FC/APC-N (NTT) and FC/APC-R (Reduced). An FC/APC-N connector key will not fit into
4355-402: The usual way to listen to them was to plug in headphones. There is also an EIA standard for 0.141-inch miniature phone jacks. The 2.5 mm or sub-miniature sizes were similarly popularized on small portable electronics. They often appeared next to a 3.5 mm microphone jack for a remote control on-off switch on early portable tape recorders; the microphone provided with such machines had
4422-518: Was initially mocked for removing the socket by other manufacturers like Samsung and Google who eventually followed suit. The socket is also not present in some tablets and thin laptops (e.g. Lenovo Duet Chromebook and Asus ZenBook 13 in 2020 ). The US military uses a variety of phone connectors including 9 ⁄ 32 -inch (0.281-inch, 7.14 mm) and 1 ⁄ 4 -inch (0.25 inch, 6.35 mm) diameter plugs. Commercial and general aviation (GA) civil aircraft headsets often use
4489-455: Was installed or 1878, when an early switchboard was used for the first commercial manual telephone exchange in New Haven created by George W. Coy . Charles E. Scribner filed a patent in 1878 to facilitate switchboard operation using his spring-jack switch . In it, a conductive lever pushed by a spring is normally connected to one contact. But when a cable with a conductive plug
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