Communications: electrical – Digital comparator systems
Patent
1979-06-18
1981-04-28
Yusko, Donald J.
Communications: electrical
Digital comparator systems
1791753R, H04Q 900, H04B 346
Patent
active
042648947
ABSTRACT:
An automatic fault detection and modem bypass circuit for a standard land line data transmission system containing a plurality of series connected modems arranged in a conventional hub configuration is disclosed. A relay is located in a central collecting station of the hub and connected so as to open an input line to at least one of the modems and an output line from a line amplifier connected to an output line of the same one of the modems upon the occurrence of a fault in the input line to such modem. A series connected combination of an amplifier and a switching transistor is responsively connected to the output line of such modem and operatively connected to the coil of the relay to simultaneously disconnect such modem from the series connected hub group and connect an output line from a line amplifier immediately preceeding such modem in the series connected group to an input line of a modem which next succeeds such modem in the group. Means is provided for listening to the various signals on the input and output lines to and from each of the modems to enable a trained operator to locate faults in the system by sound. An additional feature includes a relay switch connected between the output terminals of a modem and its output line which is responsive to a fault on the input line to such modem so that the automatic bypass circuit can be made to remove the modem from the series connected group upon the occurrence of a fault on either an input or an output line to or from such modem. The circuit of the disclosure permits a given modem in a series connected group of modems to be removed from the group without disrupting the operation of the remaining modems in the group.
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Miller Jr. Maurice L.
Yusko Donald J.
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