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Fiber-optic network concentrator" for 1-Mbit/sec X.25 HDLC data

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Abstract

The fiber-optic network concentrator described here is designed to allow a host computer to service multiple terminals using a high-speed HDLC protocol. Functions provided in the fiber-optic concentrator include RS-422/V.11 driver/receivers for interface to the host, Manchester encoders and decoders, port switching, and self-test. Two complete network concentrators each including power supply, host interface, and eight fiber-optic interface assemblies can be housed in a single 19-in. wide rack, 83/4 in. in height. The two banks can be used independently to service sixteen terminals or collectively to service eight terminals with complete redundancy. Figure 1 shows the block diagram of the system.

© 1983 Optical Society of America

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