Keystone module

This provides much flexibility in arranging and mounting many different types of electrical jacks in one plate or panel without requiring customized manufacturing.

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.

[1] The module referred to in that patent was affixed by "A pair of diagonally inclined mounting flanges (which) include stepped, panel bearing surfaces .. at the outer free ends thereof."

[2] In this design the module is affixed by a single diagonally inclined mounting flange, together with a protuberance (ramp) on the opposite side.

The jack assembly is then rotated and snapped into place due to deflection of the cantilever latch of the housing."

A keystone module for a CAT5 network cable
A 3-port keystone wall plate
An assortment of different keystone modules. From left to right: 6P6C (RJ-11), 8P8C (RJ-45) with mini 110 block in rear, 4-pin mini-DIN (S-Video) jack, RCA jack, F connector, banana jack.