The LT-1 connector family of transmultiplexers

The LT-1 family of transmultiplexers was designed to provide a flexible and economical means of interconnecting the widely deployed long-haul analog transmission plant with the emerging network of digital switches and facilities. The LT-1 connector eliminates redundant interfaces and uses custom integrated circuits. The most significant improvement is in the analog signaling circuits — the function of an entire circuit pack is reduced to circuitry occupying less than 2 square inches. Reuse of circuits designed for other systems under development helped to introduce this technology rapidly. The original design, targeted for the 4ESS™ market, was enhanced with three additional designs, which expanded the signaling capability to include special services, added a digital echo canceler for satellite applications, and provided compatibility with international signaling.