Timing recovery is a critical function that must be provided in a digital subscriber loop receiver.Low-cost electronics for digital subscriber loop systems will be achieved with VLSI technology.Samppled-data techniques are the most practical means of obtaining the necessary signal processing functions in VLSI form The sampled-data timing recovery techniques described in this paper are applicable to both hybrid-mode and burst- mode systems.The baudrate sampling technique in conjunction with a special line coding and timing function fulfills all the objectives for timing recovery in digital subscriber loop systems.A detailed performance study has been carried out.including analysis,simulation,and experimental measurements on a variety of cable configurations,some including bridged taps.Jitter in the recovered uming signal is particularly critical to the performance of the echo canteller in hybrid-mode systems.Analysis of the jitter performance leads to design techtuques for reducing the jitter magnitude.
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