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
Methods and systems for determining the reliability of transaction
Over the counter medicinal container with surface ornamentation
Cavernous nerve stimulation via unidirectional propagation of action potentials
Generating package profiles in software package repositories using selective subsets of packages
Methods, systems, and products for providing ring backs
Method and apparatus to maintain welding current to compensate for deterioration of welding contact tip
Automotive lighting system
  Randomly Featured Patents
Rail road car truck
Apparatus for automatically starting engines
Signaling torque driver and method
Method for the status analysis of a subscriber loop to support broadband telecommunication services
Transmitting RF signals employing improved high-level combinations of analog FM and digital signals
Optical repeaters for single- and multi-wavelength operation with dispersion equalization
Acceleration control apparatus for vehicle
Aqueous polyester-polyurethane dispersions and their use in coating compositions
Scissors
Apparel with panel attachments along selected margins