I had read several reliable reports about using these in a digital audio system to improve the quality of the sound. The fibre segment isolates the system from any unwanted upstream contamination of the signal due to electrical noise. http://www.audiostream.com/content/electrically-isolate-your-networked-audio#yRySQG9VSgVcx6y9.97 I bought two of these and they are plug and play easy and rock solid reliable. I didn't need the gigabit version with my router, these work perfectly. There is a noticable improvement in the sound of my system.