1. Audio or video. A 19" rack mounted assortment of female connectors, usually 26 jacks wide, also known as a "jack field." Articulate Sound - Portfolio The most common manufacturers are Switchcraft, ADC, Neutrik, and Bittree. Note the patchbay can be damaged by using the wrong type of patchcords. Phone plugs (1/4") and Bantam/TT are similar but not interchangeable. See this thread: http://www.controlbooth.com/forums/sound/12922-patchbay-jack-problems.html. 2. See Patch Panel, definition #3.