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FLAG FIELD-BASED ROUTING MECHANISM FOR FIBER OPTIC TELECOMMUNICATION SYSTEM EMPLOYING STS-BASED TRANSMISSION FORMAT CONTAINING ASYNCHRONOUS TRANSFER MODE CELLS
FLAG FIELD-BASED ROUTING MECHANISM FOR FIBER OPTIC TELECOMMUNICATION SYSTEM EMPLOYING STS-BASED TRANSMISSION FORMAT CONTAINING ASYNCHRONOUS TRANSFER MODE CELLS
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机译:包含异步传输模式单元的基于STS的传输格式的光纤通信系统中基于标记场的路由机制
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摘要
A two-stage cell routing filter mechanism employs a customer premises associated flag bit field in ATM data cells being serially transmitted from a host digital terminal's data transport path through an optical fiber to a downstream optical network unit associated with a plurality of customer premises equipments. The first stage of the cell routing filter is comprised of a look-up table (LUT) and an associated comparator mechanism. The state of each bit of the flag field of an ATM cell preamble will indicate whether or not the ATM cell is intended for the customer premises equipment associated with the bit. A downstream optical network unit contains an associated set of ATM cell filters associated with customer premises equipment. Each customer equipment cell filter examines a given bit position in the flag field portion of each received ATM cell preamble, to see whether the flag field bit of the preamble of the received ATM cell is set to prescribed bit value (e.g. one)-indicating a customer channel request.
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