homes which are connected to a central office using telephone wires dslams are present in the central offices each component is described below in further detail remote system 530 is shown containing processor 560 and dsl modem 510 processor 560 performs various operations on digital data which may have to be transmitted dsl modem 510 transmits digital data by converting digital data into analog form and transmitting over a telephone line as described above similarly dsl modem 510 converts analog signals received over telephone line 534 543 into digital format before providing the data to processor 560 the analog data is transmitted to and received from central exchange 540 on paths 534 and 543 dslam 540 is shown containing dsl modem 520 and dsl mux 570 dsl modem receives analog signals over a telephone line and converts the signals into digital format dsl mux 570 receives and transmits digital data to various others systems potentially using routers and or switches not shown that are connected to central exchange 540 dsl modems 510 and 520 may correspond to modem 100 of fig1 in an embodiment dsl modem 520 can be implemented in an asymmetric digital subscriber 39 s loop adsl technology as is well known in the relevant arts adsl technologies enable the user to receive data at a faster rate downstream rate a high signal to noise ratio is desired when data is received at a fast rate thus the present invention is particularly useful in implementing modem 510 in adsl environment thus the embodiments described above can be used to improve reception of data in dsl modems the present invention enables a modem to operate within a narrow voltage range while maintaining a high signal to noise ratio while various embodiments of the present.