An optical signal transmitter is disclosed that transmits an optical signal with corresponding Wavelength Division Multiplexing channels and Time Division Multiplexing channels. The glass run includes a hollow seal part, and the base of the seal part has a slit. Once the host power is disconnected from the carrier, an alternate power source continues to provide power to keep the FRU indicator illuminated for repairs or replacement. Computers on-board the vehicles and intermediate nodes determine which pairs of vehicles and intermediate nodes should establish links to form a network based on the route data and link scoring.