Location of a faulty pulse form restorer in a cable system

Details Location of a faulty pulse form restorer in a cable system Location of a faulty pulse form restorer in a cable system

1977-09-12

1980-09-02

Stewart, David L.

Multiplex communications

Wide area network

Packet switching

1791753F, 370 15, H04J 314

Patent

active

042208335

ABSTRACT:
A pulse form restorer (pulse repeater) which detects that it is not passing pulse bit steam inserts a fixed resistor in series with the constant current cable power supply, and isolation of the faulty unit is accomplished by measurement of the voltage drop through the cable system. In a test mode the near end driver modulates the digital data at a slow alternating rate. A cable fault locator coupled to the power supply output comprises a peak detector, an A/D converter and a numerical display, which convert the change in voltage between data-on and data-off intervals to a number, which by a table look up designates the faulty restorer.

REFERENCES:
patent: 3235677 (1966-02-01), Friedrich
patent: 3297833 (1967-01-01), Houten

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