An A is the logical name for a standard communications port. AUX is an asynchronous serial port with an interface that allows the auxiliary input of audio signals for:
- MP3 players
- Portable music players
It is an interface that permits a PC or other device to transmit or receive data one bit at a time. Generally, the AUX port on a PC is computer port 1 (COM1), which is the first serial port with a preconfigured assignment for serial devices.
The AUX port is typically used for audio equipment that receives peripheral sound sources, such as digital music players or audio speakers. The peripheral sound device is connected to an AUX port or other medium such as a vehicle’s audio jack.
An auxiliary port is also known as an auxiliary jack or auxiliary input.