ST (Straight Tip) - ST connectors are less common than Toslink connectors. They have a cylindrical ferrule with a flat tip. ST cables are available in lengths up to 100 meters.
SC (Subscriber Connector) - SC connectors are the most common type of optical connector used in telecommunications. They have a square ferrule with a 2.5mm diameter. SC cables are available in lengths up to 100 meters.
LC (Lucent Connector) - LC connectors are smaller and more compact than the other types of optical connectors. They have a square ferrule with a 1.25mm diameter. LC cables are available in lengths up to 100 meters.
The best type of audio optical cable for your application depends on the distance between the devices you are connecting and the quality of the audio signal you want to transmit. For short distances and high-quality audio, Toslink cables are the best option. For longer distances, ST or SC cables may be a better choice, and LC cables are ideal for very long distances or in high-density environments.