Editing Last mile (telecommunications) (section)

====CATV====
Community antenna television systems, also known as [[cable television]], have been expanded to provide bidirectional communication over existing physical cables. However, they are by nature shared systems and the spectrum available for reverse information flow and achievable [[signal-to-noise ratio|S/N]] are limited. As was done for initial unidirectional TV communication, cable loss is mitigated through the use of periodic amplifiers within the system. These factors set an upper limit on per-user information capacity, particularly when many users share a common section of cable or [[access network]].