Our 20m Coaxial Cables are much longer than most standard digital coaxial cables and have been manufactured to ensure digital signal can be run over the longer 20m distance without issues, suitable for dolby digital and DTS Audio, Digital coaxial cable for digital audio signals, SPDIF audio is a digital signal used for dolby digital, DTS audio, dolby digital and DTS are audio formats used on DVD / Blu-Ray Discs, so you will find SPDIF (digital coaxial) on DVD / blu-ray players, amplifiers, TV's, computers, Home cinema systems.
Although a digital coaxial cable has an RCA plug it's not the same as a standard RCA cable. Digital coaxial cables are screened RG59 Cables, standard RCA cables although occasionally are screened are not suitable for Digital Coaxial / SPDIF.