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Osccillations of the Josephson supercurrent have been observed in Pb/Al/AlOx/Pb junctions. The oscillations only occur in the temperature dependence of the supercurrent in a constant magnetic field. Causes for these oscillations are discussed in terms of the change of the London penetration depth and the Josephson penetration depth with temperature.

This paper calculates the response time of a VSAT network. The response time consists of network access time from VSAT terminals to the hub station, query waiting and processing time, plus response queueing and transmission delay. In addition to mathematical derivations, numerical examples are given to demonstrate several interesting phenomena. Computer simulations are also provided to verify the validity of the derived results.

A previously proposed contention‐based TDMA protocol is modified to remain operational for a channel which is not noise free. The protocol is a mixture of random accessing and time division multiplexing and is suitable for data transmission through a channel which is characterized by non‐negligible round‐trip signal propagation delay. The effect of channel errors on the performance of the protocol is studied. Through numerical calculation it is observed that for the bit‐error‐rates encountered in practice the protocol remains stable. When the channel becomes rather noisy, error correcting codes can be imbedded to improve the performance. The validity of analysis has been verified by computer simulation.

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