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Ferrite-core unit as combined memory and line scanner in electronic telephone exchanges

Ferrite-core unit as combined memory and line scanner in electronic telephone exchanges

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The paper describes a ferrite-core unit serving both as memory and line scanner in a 64-subscriber electronic telephone exchange used as a p.a.x. (private automatic exchange). This dual function is realised by ferrite cores with a rectangular hysteresis loop, using working points different from those of conventional computer core memories and determined by m.m.f.s produced by currents in the appropriate windings. The cores are arranged in a square matrix and are scanned by a ‘linear-selection’ mode. A special bridge amplifier, with logic-controlled switches in its four arms and the reading winding at its centre, permits the reading currents to be directed as required by actuating a pair of opposite arms.

References

    1. 1)
      • Spektor, D.: `Electronic telephone exchange', 1968, M.Sc. thesis (in Hebrew), Israel Institute of Technology, Technion, Haifa, Israel.
    2. 2)
      • T.E. Herbert , W.S. Procter . (1932) , Telephony.
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      • R.W. Ketchledge . From Morris to Succasunna. Bell Lab. Record , 204 - 209
    4. 4)
      • AEI: ‘REX, an introduction to Read electronic switching systems’.
    5. 5)
      • O. Mayer . Ein neues Wählamt für das Österreichische Fernsprechnetz. WSW Tech. Ber.
    6. 6)
      • S.H. Caldwell . (1958) , Switching circuits and logical design.
    7. 7)
      • R.S. Ledley . (1960) , Digital computer and control engineering.
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