Shan Duomu the pattern switch is uses for the multi-mold light signal to transform into the single model light signal pattern switch, its characteristic was may use with an equipment the different light pattern signal between two webpages to interlock, enhanced the wiring flexibility. Because the signal is by the light pulse form in the light thousand kind of transmission signals, therefore it is opposite in the copper wire has many merit: The security, the reliability, the transmission speed, the transmitting range is suitable for the local area network, the metropolitan area network network, uses the modulation structural design to be advantageous for the upper spider to carry on the centralized management.