AGPtek Optical Analog Coax to Digital Audio Cable Adapter Converter Provides electromagnetic noise free transmission Both TOSlink and Coax digital outputs may be used simultaneously Digital audio cable length can run up to 15 feet without signal degradation Supports output sampling rate at 48KHz The new ADC-48K Analog to Digital Audio Adapter converts analog Left/Right RCA-style audio connections to digital S/PDIF coax or TOSLink outputs. The unit is compact, easy to install, and operates in a wide variety of operating conditions.