Editing Telephone jack and plug (section)

==List of plugs==
:{{Expand list|date=January 2009}}

===Modular connectors===
{{Main|Modular connector}}

*[[4P4C]] and [[4P2C]] for handset cables (often erroneously referred to as RJ9, RJ10, and RJ22)
*[[6P2C]] for [[RJ11]] single telephone line
*[[6P4C]] for [[RJ14]] two telephone lines
*[[6P6C]] for [[RJ25]] three telephone lines
*[[8P8C]] for [[RJ61]]X four telephone lines, [[RJ48]]S and RJ48C for four-wire data lines, [[RJ31]]X single telephone line with equipment disconnect, [[RJ38]]X (similar to RJ31X but with continuity circuit)

===Other connectors===
*50-pin [[micro ribbon|miniature ribbon]] connector for [[RJ21]]X, used for up to 25 lines for multiline phones such as the [[ITT 2564]], [[key telephone system]]s such as the [[1A2 Key System]], and [[Private branch exchange|PBX]] systems.

===International standards===
* [[RJ11]], by far the most common
* [[BS 6312]], British
* [[F-010]], French
* [[TAE connector]], German

===National standards===
* [[TDO-connector]], Austria
* [[WT-4]], Polish and Eastern Bloc national standard, also adopted in Russia as ШТР-IV (SHTR-IV)
<gallery>
File:WT-4 & RJ11 telephone plug.png|WT-4 telephone plug (A) with RJ11 outlet (B)
File:WT-4 & RJ11 telephone socket.png|GTN-4 telephone socket (A) with additional RJ11 socket (B)
</gallery>

The Polish WT-4 plug is also adopted in the [[Eastern Bloc]] and Russia as ШТР-IV (SHTR-IV) and has four metal pins and an additional fourth dielectric pin. The corresponding socket comes in two variants. The GTN-4 socket (РТШ-IV (RTSH-IV) in Russia) provides a 4 pin connection (in most cases, the two rightmost pins are used for connecting a single line). The GTNC-4 (РТШК-IV, RTSHK-IV) is a GTN-4 socket that has an additional circuit. The 5th plastic pin of the inserted plug disconnects a 1[[Microfarad|μF]] [[capacitor]] that otherwise closes the circuit of the telephone line when the plug is not inserted. This feature allows testing the line when the phone is not plugged in.<ref>{{Cite web|url=http://minsvyaz.ru/uploaded/files/Pravila_tekhnicheskogo_obsluzhivaniya_lineynykh_sooruzheniy_svyazi.pdf#page=4|title=Правила техобслуживания и ремонта линейных сооружений и оконечных устройств абонентских пунктов местных сетей связи|last=|first=|date=1996-07-10|website=|publisher=[[Ministry of Telecom and Mass Communications of the Russian Federation]]|language=Russian|access-date=}}</ref> The usage of a capacitor is mostly obsolete and GTN-4 sockets produced later reuse the capacitor compartment for an additional RJ11 socket.

===Legacy===
[[File:BTicino spina e presa telefonica.jpg|BTicino telephone plug and socket|thumb|right]]
* [[600 series connector]], Australia
* [[Protea (telephone)|Protea]], South Africa
* [[Swedish telephone plugs & sockets|SS 455 15 50]], Sweden and Iceland
* [[Telebrás]] plug, Brazil
* [[Tripolar plug]], Italy
* BTicino 2021 (with or without line interruption), Italy (rare)
{{clear}}