tailieunhanh - E1 Quad Fibre Loop Converter

The Quad Fibre Loop Converter* (QFLC) system is a cost-effective optical multiplexer that transports four E1s over two singlemode fibres. The QFLC system can be configured to maximize facility utilization for point-to-point or point-to-multipoint topologies. The QFLC system can also be used for fibre ring networks for both dual-feed and single-feed applications to a customer. The QFLC system accepts standard electrical E1 signals and can be used in a stand-alone configuration with any approved multiplexer or network element that generates a standard E1 ( Mbps) signal. The QFLC system consists of a rack mount central exchange (CE) chassis with up to eight QFLC modules. Sixteen protected. | E1 Quad Fibre Loop Converter Application Overview Introduction The Quad Fibre Loop Converter QFLC system is a cost-effective optical multiplexer that transports four E1s over two singlemode fibres. The QFLC system can be configured to maximize facility utilization for point-to-point or point-to-multipoint topologies. The QFLC system can also be used for fibre ring networks for both dual-feed and single-feed applications to a customer. The QFLC system accepts standard electrical E1 signals and can be used in a stand-alone configuration with any approved multiplexer or network element that generates a standard E1 Mbps signal. The QFLC system consists of a rack mount central exchange CE chassis with up to eight QFLC modules. Sixteen protected or thirty-two unprotected E1s can be transported from a single eight-position CE chassis and can hub to four remote terminals RTs in a protected configuration eight RTs in an unprotected configuration . Protected vs. Unprotected Circuits The ADC QFLC multiplexes up to four E1 signals for simultaneous two-way full duplex transport over two singlemode fibres for distances up to 33 km. Two fibres are used when deploying unprotected service. Four fibres should be planned for use when deploying protected service two fibres are used for the working circuits and two fibres are dedicated to circuit protection. The QFLC system configured for protected applications is a 1 1 protected system. Automatic protection switching APS is established with a setting on the chassis backplane during installation. This ensures against failures to either the optical facilities or the electronics. The system also monitors degrading bit error rate BER and it will protection switch once the bit error rate passes a user-selectable threshold. In the unprotected configuration one module is located at the CE and one module is located at the RT In the protected configuration a second set of modules one at the CE and one at the RT is connected to two .

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