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    8.
    发明专利
    未知

    公开(公告)号：DE1274632B

    公开(公告)日：1968-08-08

    申请号：DEJ0019198

    申请日：1960-12-19

    Applicant: IBM

    Inventor： HAIBT LUTHER H ,  RUTLEDGE JOSEPH D

    IPC: G06F11/20 ,  G11C11/44 ,  H03K17/92 ,  H04B1/74

    Abstract: 920,370. Electric selective-signalling systems. INTERNATIONAL BUSINESS MACHINES CORPORATION. Dec. 29, 1960 [Dec. 30, 1959], No. 44560/60. Class 40 (1). Data is transmitted over a plurality of channels each of which is assigned a different priority rating; and when a fault is detected on two or more of the channels simultaneously, one of a number of spare channels is switched in to replace that faulty channel which has the highest priority. In the embodiment described the information channels extend between cryogenic elements printed on plates immersed in a liquefied gas, for example in a computer. Information to be transmitted over channels M1-M4 is set into cryogenic bi-stable circuits of sending register 10, and, in normal operation, current flows in either the ONE or ZERO line of each channel M1-M4, through replacement switches 12, 14 to set corresponding bi-stable circuits in receiving register 16. If a break occurs in one channel line carrying current, no current will flow along a corresponding one of lines 20-23, it being diverted along one of lines 31-34 to the replacement switch control circuit 70 in which it co-operates with current flowing in one of the output leads 61-65 of shift register 56 to drive a cryotron gate resistive and provide a superconducting path from the defective channel output of the sending register 10 to one of the spare channels S1-S5 determined by which of leads 61-65 is marked. At the same time, the absence of current on the corresponding lead 80-83 causes a corresponding switching operation to take place at the receiving end so that the spare channel is connected to the defective channel input of the receiving register 16. Shift register control circuits then cause shift registers 56, 110 to mark their next output lead in preparation for selecting the next spare channel, a reset pulse on lead 38 restoring current to the " repaired " channel. If several channels develop faults simultaneously, the detector and sequence circuits 30, 90 allot the available spare channels in sequence in a predetermined order of preference. For example, if channels M1, M3, M4 develop faults and spare channel S1 is already in use, then channel S2 may first replace M4, then channel S3 may replace M3, and finally S4 may replace M1. Specification 862,178 is referred to.

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