Asymmetric digital subscriber line modem apparatus and methods therefor

A modem comprising:

• a receive re-sampler;
• a transmit re-sampler connected, at least indirectly, to the receive re-sampler;
• and
• only one timing mechanism (i) electrically connected to the receive re-sampler and the transmit re-sampler and (ii) including a single coefficient generator shared between the receive and transmit re-samplers;
• wherein the timing mechanism includes a single phase accumulator configured to synchronize a receive timing scheme and a transmit timing scheme and is based on a symbol clock derived from a signal received as input to the receiver.

A method for synchronizing timing in a modem re-sampler having only one timing mechanism, configured to receive input data signals and a transmitter configured to produce output data signals, the method comprising:

• re-sampling an initially received input data signal based upon a first receive coefficient from a single coefficient generator to produce an interpolated signal thereby;
• producing signal phase data based upon the interpolated signal;
• generating (i) ensuing receive coefficient signals and (ii) transmit coefficient signals based upon the signal phase data;
• and
• synchronizing subsequently the received input data signals and output data signals in accordance with the ensuing receive coefficient signals and the transmit coefficient signals, respectively.