Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Over-current verifier circuit for an enhanced subscriber line interface










Image Number 4 for United States Patent #5163090.

An over-current verifier circuit used in a Subscriber Line Interface Circuit (SLIC) for validating an over-current condition on a subscriber loop comprising a first counter connected to the SLIC disposed to receive an oversense signal from the SLIC. The first counter begins counting when the oversense signal is received and produces an output signal when the oversense signal is still active after the counter finishes, denoting a dc over-current in the subscriber loop. A timer circuit connected to the SLIC also receives the oversense signal. The timer is arranged to begin counting when the oversense signal is received. A second counter further receives the oversense signal and is advanced by one count on the high to low transition of the oversense signal. The second counter produces an output signal when three counter advances are produced before the timer times out, denoting an ac over-current condition. A register circuit connected to the first counter and to the second counter is arranged to receive the first counter output signal or the second counter output signal and transmit to a logic interface an over-current signal advising a central controller that an over-current condition exists on the subscriber loop. Finally, a cut clear pulse generator connected to the register circuit and to a cut relay is also arranged to receive the over-current signal from the register circuit and produce an output pulse that enables the cut relay. The cut relay then electrically breaks the subscriber loop, isolating the SLIC from the subscriber loop.








 
 
  Recently Added Patents
Reactor, plant and process
Electrode structure for marine electromagnetic geophysical survey transducer cables
Method and apparatus for separating air
Universal sign post base
Control flow analysis methods and computing devices for converting COBOL-sourced programs to object-oriented program structures
Mold manufacturing method and electrode structure for use therein
Compounds
  Randomly Featured Patents
Article of headwear convertible between hat and neckwarmer and method
Printing oligonucleotide arrays
Building construction
Pivot assembly for a structured vehicle seat
System and method for delivering a bifurcated stent
System and method for performing soft tissue massage therapy
Polarized contact lenses with a clear peripheral portion
Triazine derivatives
Sense database
Modular application tooling for electrical connectors