Patent ID: 6046995
Filing Date: 2000-04-04
Classification: H04L,H04M

Abstract:
In a telephone station connected via a modem to a two-wire telephone line, a Universal Asynchronous Receiver Transmitter (UART) communicating with the modem, a microprocessor and a digital signal processor for effecting voice and data transfers and communicating time division multiplex protocol control to a like telephone station on the same line, the UART comprising in combination:synchronization means including adjustable master clock means for defining the respective positions of individual ones of a plurality of voice and data packets within a TDM frame having a predetermined data bit structure;receiver means connected to the modem for acquiring a first valid packet header and start bit and issuing a sync pulse to the synchronization means to adjust the master clock means to conform to the timing of a new communications session;a receive data register coupled to a first output of the receiver means for temporarily storing data packets indexed to a first position within a TDM frame by the synchronization means; anda receive voice buffer connected between a second output of the receiver means and the input of the digital signal processor for accumulating and temporarily storing voice packets indexed to a second position within the TDM frame by the synchronization means.