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Using Fiber Optic technology, Electro-Magnetic Pulse (EMP) protected enclosures were installed in the Colorado Springs Area (CSA). EMP in the communications community is of concern because of the detrimental effect a high altitude nuclear burst would have on electronic and communications equipment. Computer Sciences Corporation, Colorado Springs Operation was tasked by the Air Force to EMP protect critical communications circuits to enable key personnel to communicate to these locations. This system of circuits comprises nine different EMP protected enclosures throughout CSA. The enclosures were inter-connected by either a microwave radio link or a fiber optic link. The fiber optic links utilized a dual, 50/125 micron, multimode, graded index, silica fiber. Two types of modems were used as the light transmitters and receivers. A pair of full duplex digital asynchronous modems were installed to carry the T-1 (1.54 Mbps) data. Dual channel, analog, full duplex modems with a bandwidth of 25 kilohertz were used in the voice circuits. Large EMP shelters were placed at key locations and interconnected by microwave radio links. Co-located with the radios were multiplexers, an uninterruptable power supply and the fiber optic modems. The fiber optic links go out from these sites to terminal loca-tions. Two fiber optic voice channels provide EMP protected telephone communications to select sites. Each of the terminal locations consists of an EMP enclosure containing a self supporting power supply, an AC/DC inverter, telephone signaling equipment (utilizing Single Frequency SF signaling) and fiber optic modems. Each terminal is expected to provide survivable communications although not indefinitely. This project required interfacing a variety of different communications equipment such as microwave radios, fiber optic modems, channel banks and multiplexers. The communica-tions links used twisted pair cable, microwave transmission, coaxial cable and fiber optic cable carrying data rates of 300 baud to 1.544 Mbps. Computer Sciences Corporation had made provisions to allow for expansion and upgrade and is vigorously supporting that effort.
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