[...] Digital networking has been around for some 20 years, with A/D and D/A conversion at the exchange. Interconnections between exchanges and the "network" are entirely with digital format, with d
see if there is any residual of 8 kHz harmonics. My lines are analogic, but in the central exchange they are, by sure, digitized at 8kHz rate... some digital buzz may leak out. The problem may be fro
I asked my neighbors, but nobody has an ISDN line here. Just plain old analog. But ADSL and ISDN can be found in a nearby town, about 5 km from here. Given that today all telephone lines are buried,
Alberto and others, The most plausible explanation, as already mentioned on the reflector, is that the lines come from the sampling rate of 8 kHz used by digital telephone systems. There could be se
[...] Hi Alberto, vy diff specras around 136kHz at ur QTH and mine. see enclosured Spectran shots. took a part out of ur pic named "at136kHz". sri for disfiguring it. [...] Hi Uwe, yes, our spectra
