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The ST Connector is a keyed bayonet connector and is used for both multimode and single-mode fiber-optic cables. It can be inserted into and removed from a fiber-optic cable both quickly and easily. Method of location is also easy. ST connectors come in two versions: ST and ST-II. These are keyed and spring-loaded. They are push-in and twist types.
These connectors are generally used with audio and audio-visual (AV) equipment, and are solely for use with unbalanced signals. The connectors are colored according to the signal type. The white connector is used for sending signals to the left (L) channel, and the red connector is used for sending signals to the right (R) channel.