You know, this could be opportunity for some new technology, as ISDN (x.25) is just too much for meters (fixed rate 64kbit via one pair, ISDN usually two pairs,

You know, this could be opportunity for some new technology, as ISDN (x.25) is just too much for meters (fixed rate 64kbit via one pair, ISDN usually two pairs, so 128k), even when it is really fit on power (traditional telco line is powered, enough for modern CMOS circuits) and cable length.