The algorithms used for logic‐circuit simulation in the Logic Analyzer for Maintenance Planning (LAMP) system are described. Several simulators are available to allow a cost‐effective tradeoff between simulation cost and the level of detail needed for a particular application. The true‐value simulator provides efficient simulation of fault‐free logic circuits. Two fault simulators simulate the classical stuck‐at faults as well as shorted‐gate‐output faults. Hyperactive faults, those faults which cause an inordinate amount of simulation activity, are discussed along with their impact on simulation time. A four‐value simulation logic is described which simplifies circuit initialization procedures.
The L3 coaxial system is a new broadband facility for use with existing and new coaxial cables. It makes possible the transmission of 1,860 telephone channels or 600 telephone channels and a television channel in each direction on a pair of coaxial tubes. The principal system design problems and the methods used in their solution are described. The over‐all system is described in terms of its components and their location in the system.
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