How does the traffic data get back to the TSMC?
Each field cabinet is equipped with a type Bell 202 1200 bit-per-second modem. This modem is connected to copper wires that interconnect 8 field cabinets together with a communication hub. The copper wires run up to 5 miles and the communication hubs are spaced at 10 mile intervals. Fiber optic cables connect the hubs together and to the TSMC. These fiber optic cables carry information from the traffic counters as well as the video cameras.