Issue No.10 - October (1984 vol.33)
J.L.W. Kessels , Philips Research Laboratories
Two designs of a fault-tolerant clocking system are described: a time-discrete design based on autonomous oscillators and a time-continuous design based on voltage-controlled oscillators. In both designs the system consists of a number of identical modules producing as many mutually synchronous binary clock signals. The system is fault-tolerant in that if at most f modules fail, the remaining modules continue to produce synchronous clock signals. The minimum configuration, i.e., the minimum number of modules that guarantees a fault-tolerant operation, is either 3f + 1 or 2f + 1, depending on both the design chosen (time-discrete or time-continuous) and the assumed fault model.
triple modular redundancy (TMR), Binary clocks, correctness proof, fault-tolerant clocking system, fault-tolerant systems, massive redundancy, multiple modular redundancy, synchronization
J.L.W. Kessels, "Two Designs of a Fault-Tolerant Clocking System", IEEE Transactions on Computers, vol.33, no. 10, pp. 912-919, October 1984, doi:10.1109/TC.1984.1676352