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Phone jacks and plugs are connectors used with telephones and other audio systems. They are also known as modular jacks (female) and modular plugs (male). The term “modular” describes a telephone connection interface developed by AT&T that allows installers to assemble phones at customer locations by using components that can be plugged together instead of hard-wired. Phone jacks are female receptacles into which plugs or male connectors are inserted. Several types of phone jacks and plugs are commonly available. In the United States, telephone jacks are called registered jacks (RJ), licensed with the Federal Communications Commission (FCC), and described as RJ-nn, where nn is a two-digit number. The RJ-11, the most common type of telephone jack, can have six conductors but is usually implemented with four. Typically, these four wires consist of a red and green pair that carries voice and data, and a black and white pair that is used for low-voltage signals. Computers that use dial-up modems to connect to networks use mainly RJ-11 jacks. The RJ-45, another common type of jack, is a single-line device for digital transmissions over twisted or untwisted telephone wires. Both keyed and unkeyed versions of the RJ-45 are available. Other types of phone jacks and plugs include the 1/4” jack and the 1/8” jack, both of which are used as connectors in audio systems, amplifiers, and speakers. The 1/4” jack has a 0.25” diameter. The 1/8” jack has a 0.125” diameter.

Phone jacks and plugs are housed in metal or plastic cases and differ in terms of mounting styles and performance specifications. Typically, wall or box mounted devices are flanged, threaded for an accessory such as backshell, and designed for permanent mounting. Connectors with receptacle-style mounting mechanisms are used to fit panel cutouts. Dummy receptacles do not have provisions for attaching conductors and are generally used for the storage of a cable assembly connector plug. Performance specifications for phone jacks and plugs include voltage rating, current rating, contact resistance, insulation resistance, dielectric withstanding voltage, and operating temperature. Contact resistance is the measurement of the electrical resistance of mated contacts when assembled in a connector under typical service use. Electrical resistance is determined by measuring from the rear of one contact area to the rear of the contact area of its mate (excluding both crimps) while carrying a specified test current. Dielectric withstanding voltage is the maximum potential gradient that a dielectric material can withstand without failure. The values that suppliers provide depend upon the thickness of the material and the method and conditions of the test. Another important product specification for phone jacks and plugs is the number of contacts or ways that mate with corresponding elements to provide an electrical path.


Products & Services Related to Phone Jacks and Plugs
Audio Connectors
Audio connectors are used to affix cables to other audio equipment, providing electronic signal transference and grounding protection.
Circular Connectors
Circular connectors are multi-pin connectors primarily used for external interfacing.
D-subminiature Connectors
D-subminiature or D-sub connectors are sturdy electrical connectors with a mating face shaped like the letter D. They provide polarization because male and female connectors can fit together in only one way.
DIN Connectors
DIN connectors are high frequency, multi-pin, electrical connectors that meet standards established by Deutsches Institut für Normung (DIN), a German national organization for standardization. The ends of DIN connectors are round, notched, and protected by a metal skirt to ensure that pins line up correctly.
Electrical Connectors
Electrical connectors are devices that join electrical circuits together. Male connectors plug into receptacles, jacks, and outlets. Female connectors contain sockets to receive other devices.
Fibre Channel Connectors
Fibre Channel connectors are high-speed connectors used in Fibre Channel systems.
RF and Microwave Connectors
RF and microwave connectors are used to connect the ends of cables in systems that operate in the radio frequency (RF) or microwave spectrum. They include threaded or bayonet-style couplings that snap, screw, or push into place.

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Engineering Web: Phone Jacks and Plugs
Pages: 1 - 5 of 1714858
1/4'' Phone Jacks and Plugs
... Phone Jacks and Plugs By Manufacturer. View products by clicking on the manufacturer Expand All Manufacturers Collapse All Manufacturers Sponsored Manufacturers. Powered by InfoComm iQ Copyright 2008 ...
Howstuffworks "Consumer Electronics Show 2001"
Inside of the unit is a 200 MHz Geode CPU from National Semiconductor, 32 MB RAM, 16 MB Flash memory and a V.90 56K modem. Ports include dual phone jacks, two USB ports, a serial port and a line out ...
Digi-Key Product Index
Phone Jacks/Plugs 0162-0163 *Phono Jacks/Plugs 0159 , 0166 *Power 0081-0088 , 0127 , 0163-0167 , 0686 *Power Supply 0060-0061 *Rack and Panel 0090 *Reverse Polarity SMA 0477 *RF 0150-0158 , 0162 *RF, ...
Digi-Key Product Index
PC Pins/Receptacles 0194 *PCMCIA Memory Card 0186-0187 *Phone Jacks/Plugs 0175-0176 *Phono Jacks/Plugs 0174 , 0179-0180 *Power 0090-0097 , 0129 , 0176-0180 , 0801 *Power Supply 0063-0064 *Rack and ...
Marshall Electronics - 1/4 inch phone plugs and phone jacks
... Phone Plugs & Jacks Pro Audio Phone Plugs Senior. Brass, nickel-plated handles. Easy-to-solder terminals with built-in cable clamps.. Part No. M-281. M-283. M-297. M-298. M-285. Description. Mono - 1/ ...
See Marshall Electronics/Optical Systems Division Information

Part Numbers for Phone Jacks and Plugs

Part # Distributor Manufacturer Product Category Description
M11 Series Methode Electronics, Inc. Methode Connector Products Phone Jacks and Plugs Polybutylene Terephthalate (PBT), glass reinforced thermoplastic insulator
M15 Series Methode Electronics, Inc. Methode Connector Products Phone Jacks and Plugs Fast Ethernet applications, RJ45 with magnetics
NJP001-D3A_-3601XB   T-MEC Phone Jacks and Plugs Life cycle of 5000 cycles, withstand voltage equals 500VAC - 1 min
PA-6P4C-3   CableWholesale.com Phone Jacks and Plugs Line 1, line 2, line 1 + 2, 1 plug To 3 jack T-adaptor. 3-way adaptor
300-04002   CableWholesale.com Phone Jacks and Plugs Phone adapter, phone adaptor England plug U.S. RJ11 jack

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Cat 5e & 6 Keystone Jacks
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Slimline Data Jacks - UK

Slimline Data Jacks - UK
Tele Tec Co., Ltd.


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