Another common application of the S / PDIF interface is the transport of compressed digital audio as defined in the standard IEC 61937. This mode is used for a DVD player to a home theater receiver to connect to Dolby Digital or DTS surround sound support. Sony HT-CT150
The "S / PDIF" specifications allow for different types of cables and connectors to. The electric cables are usually referred to as "co-axial" and "RCA connector". The optical variation is usually called "optical" or "TOSLINK", but sometimes EIAJ optical. There are converters for electric RCA S / PDIF TOSLINK connector to convert to and vice versa, but usually only in one direction. All converters require an external power supply. The optical version is used in wide variety of applications due to its immunity to electrical noise.
S / PDIF was developed from a standard used in the field of professional audio, also known as AES / EBU which is used in systems with digital audio tape (DAT) and data transmission in professional studio recording. S / PDIF is identical at the protocol level, but the connectors are modified to XLR or RCA coaxial electrical connector or optical TOSLINK connector. Both are cheaper and easier to use than the XLR connector. The cable is also changed from a cable with an impedance of 110 Ω (ohms) with balanced twisted pair in the already more common and therefore cheaper 75 Ω coaxial cable with RCA connector instead of the "F" - connector as usual with cable TV. S / PDIF, in all respects, a consumer version of AES / EBU format.