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Problem statement: Cables that are installed outdoors are subjected to harsh environmental&#13; conditions which make break down inevitable. When this happen it will disrupt the services and cause&#13; trouble to the users. To overcome this is to provide a means of restoring the network in case of failure.&#13; We introduced the Access Control System (ACS) and Customer Access Protection Unit (CAPU) to&#13; provide FTTH-PON monitoring, fault detection and protection. Approach: To design the C programs&#13; for ACS and CAPU, we will come up with the algorithms which describe the switching configuration&#13; in general. The switching configurations are tabulated in truth tables and flow charts are constructed.&#13; Based on the flow charts, the respective C programs for ACS and CAPU will be written. The C&#13; programs will then be tested through simulation. After successful simulations, the programs will be&#13; downloaded into the respective PIC microcontrollers in the ACS and CAPU for lab testing. Results:&#13; When several faults occur at various lines, each Multi Access Detection System (MADS) informs ACS&#13; and all CAPUs of the current line conditions. As programmed, ACS and CAPU will configure their&#13; switches to restore the network. When one of the working lines fail, the optical signal will be routed to&#13; its dedicated protection line. But when both its working and protection line fail, the optical signal will&#13; be routed to its neighboring protection line. Conclusion: We have successfully simulated the&#13; restoration of the optical signal when fault occur at its working line by restoring it to its dedicated&#13; protection lin

Development of an Algorithm for Fiber-to-the-Home Passive Optical Network Automatic Self-restoration Scheme Using Access Control System