Patent ID: 6807195
Filing Date: 2004-10-19
Classification: H04J,H04L,H04N

Abstract:
A broadband terminal interface unit for use in a bi-directional HFC communication network, said broadband terminal intrface unit for supporting the upstream transmission of packetized digital communication and comprisinga codec responsive to an analog input signal and generating as an output a coeded representation thereof; a digital signal processor responsive to the coded output from said codec for assembling said coded output into packets comprising a predetermined number of frames; a host microprocessor responsive to an upstream grant signal from said HFC communication network for transmitting an open channel command signal to said digital signal processor, said open channel command signal causing said digital signal processor to transmit assembled packets to a host DSP interface element for subsequent upstream transmission into said HFC communication network; and a synchronization circuit for providing timing pulses to said codec, digital signal processor and said host microprocessor to coordinate the generation and transmission of upstream packetized signals, the synchronization circuit comprising a phase-locked loop responsive to timing information from the HFC network to generate a base clock signal; and a programmable logic device responsive to the base clock signal.