Time dissemination via telephone lines using commercial modems

In this paper we will present the experimental results obtain, both in laboratory conditions and connected to the telephone network, in order to evaluate the timing capability of the system. We used a time distribution system (developed at Technische Universitat Graz, Austria) which have the capability to correct the propagation delays and a commercial modem. The dissemination system used the European code, consisting of an 80 ASCII characters line transmitted each second, supplying the date, the time and some information relative to the corrections performed on the legal time or special warnings concerning time scales.