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SONet Implementation - Virtual Tributaries
Brian Bruggeman and Brian Conway
Advisors: Dr. Brian D. Huggins and Dr. T. L. Stewart

The SONet Virtual Tributary project is to design and implement a digital multiplexing and demultiplexing communication system. We used the SONet (Synchronous Optical Network) protocol for Virtual Tributaries as the basis for the design. The primary benefit of multiplexing several, low bit-rate signals into a single, high-bit rate signal is to utilize the high bandwidth of optical fibers, which are widely used by telecommunication companies. Our project consists of three major portions: the transmitter, the receiver, and the buffers. The transmitter multiplexes the data signals and the receiver demultiplexes the data signals. Furthermore, one of the buffers is connected to the multiplexer input and synchronizes the incoming asynchronous signals at the transmitter to enable correct multiplexing. The other buffer is connected to the demultiplexer output and restores the output signals from the demultiplexer to their original bit rates. The system was designed and simulated using Logic Works and implemented using a Xilinx Field Programmable Gate Array (FPGA) evaluation kit, which is a highlight of the project.

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