Patch cable
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A patch cable or patch cord (sometimes patchcord or patchcable) is an electrical cable, used to connect ("patch-in") one electronic device to another for signal routing. Patch cords are usually produced in many different colours so as to be easily distinguishable, and are relatively short, perhaps no longer than two metres. Types of patch cords include microphone cables, headphone extension cables, XLR connector, RCA connector and ¼" TRS connector cables, and thicker, hoselike cords (snake cable) used to carry video or amplified signals. However, patch cords typically only refer to those short ones used with patch panels.
Patch cords can be as short as three inches or 8cm, to connect stacked components, or route signals through a patch bay, or as much as twenty feet or 6m or more in length for snake cables. (As length increases, cables are usually thicker, and/or made with more shielding, to prevent signal loss (attenuation) and the introduction of unwanted radio frequencies and hum (electromagnetic interference).
Patch cords are often made of coaxial cables, with a positive or "hot" signal carried through a shielded core, and the negative electrical ground or earthed return connection carried through a wire mesh surrounding the core. Each end of the cable is attached to a connector, so the cord may be plugged in. Types of connectors may vary widely, particularly with adapting cables.
Patch cords may be:
- single-conductor wires using, for example, banana connectors
- coaxial cables using BNC connectors
- Ethernet cables using "RJ-45" connectors with TIA/EIA-568-B wiring
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