was it connecting at higher speeds b4 or is it a new one connecting at only that low speed . Which OS are u using ?
INFO : I had to throw out one dlink motorola 56k chipset modem , coz it had a similar problem . Try getting a friends modem and see if that works fine and with good speed on ur system . I tried to do everything possible with the modem , only when i connected it to another pc and it connected at the same low speed did i take it would and bought a new krypton pctel 56k