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A keystone module is a standardized snap-in package for mounting a variety of low-voltage electrical jacks or optical connectors into a keystone wall plate, face plate, surface-mount box, or a patch panel.
Keystone modules have a rectangular face of 14.5 mm wide by 16.0 mm high and are held in place with flexible tabs. This allows them to be snapped into a mounting plate with correspondingly-sized rectangular holes, called ports. All keystones, regardless of the type of jack they carry, are interchangeable and replaceable. This provides much flexibility in arranging and mounting many different types of electrical jacks in one plate or panel without requiring customized manufacturing.
Some keystones use a pass-through type connector, where there is a jack on both the front face as well as the rear side. Others only have a jack on the front and employ a different mechanism for hard-wiring signal cables to the rear, such as a mini 110 block, an insulation-displacement connector, or a crimp or solder connection.
Types of modules available
Many types of jacks are available in the keystone module format, limited mainly by their physical size, including:
- 6P6C (RJ-11) modular jacks (telephone)
- 8P8C (RJ-45) modular jacks (computer networking)
- F connector (TV antenna/cable/satellite)
- RCA jacks (audio/video)
- 4-pin mini-DIN (S-Video jacks)
- HDMI jacks (high-definition video and audio)
- Optical fiber connectors
- BNC connector
- USB jacks
- Speaker terminals
- Banana connectors
- Binding posts
- 3.5 mm TRS connector (miniature stereo headphone jack)
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