The coaxial SPDIF cable is a simple mono RCA cable. See Figure 10. The optical SPDIF cable is a fiber optics. There are two kinds of optical connector. The most common is a square one (see Figure 11), but a 3.5 mm optical connector is also available (see connector on the right-hand side in Figure 12). This 3.5 mm connector has the same size as a 3.5 mm headphone plug and is commonly used on laptop computers. There are also adapters for you to convert the regular square connector into a 3.5 mm one.