Then through the use of GPS-based reference clocks at each tower (for both time and frequency), the signals are synced so each can emit a perfect copy of both signal and symbol data.

ENGADGET: blogger-avatar

My first assumption was that there was an electrical fault, but as the time settled on 5 minutes past one, I suddenly realised that it was "'clocks going back time" ...and I would have to sit through that whole hour again!

BBC: A mean time for doctors