Abstract: A method for measuring the input rate ? of an FM micro-gyro. The modulation frequency FM is first measured followed by the step of measuring a first time interval corresponding to a number of unmodulated periods of FOSC fitting into a half period of FM. A second time interval is measured corresponding to a number of modulated periods of FOSC fitting into a half period of FM. A time difference is calculated between the first and second time intervals to define a measured ?t and a modulation M is calculated that produced the measured ?t. Finally, the input rate ? is calculated by dividing M by a sensitivity S of the FM micro-gyro.

Abstract: A signal processing method and device for measuring the input rate of an FM micro-gyro having a modulation frequency FM and having an oscillator sense element having a nominal frequency FOSC is disclosed. In a first aspect of the invention, the method comprises defining a first time interval TWN and a second time interval TWP and measuring the first time interval and the second time interval by counting the number of periods of a predetermined reference frequency. The nominal frequency of the oscillator sense element FOSC is measured along with the modulation frequency FM. From these measurements, the proof mass period NW is calculated. The time difference ?t is calculated from the above measurements. The method then comprises calculating a modulation M that produced the measured ?t, preferably using an iterative method. From the above, the input rate ? is calculated by dividing M by a sensitivity S of the FM micro-gyro.

Abstract: A system of terminating signals in a telecommunication system is disclosed. In one embodiment a line card comprises functional circuitry, line card connector contacts and a termination resistor. The functional circuitry is used to interface first type ports with second type ports. The line card connector contacts are adapted to be selectively coupled to a backplane of a chassis. The termination resistor is adapted to terminate signal lines when a jumper is coupled across select line card contacts.

Abstract: A signal processing method and device for measuring the input rate of an FM micro-gyro having a modulation frequency FM and having an oscillator sense element having a nominal frequency FOSC is disclosed. In a first aspect of the invention, the method comprises defining a first time interval TWN and a second time interval TWP and measuring the first time interval and the second time interval by counting the number of periods of a predetermined reference frequency. The nominal frequency of the oscillator sense element FOSC is measured along with the modulation frequency FM. From these measurements, the proof mass period NW is calculated. The time difference ?t is calculated from the above measurements. The method then comprises calculating a modulation M that produced the measured ?t, preferably using an iterative method. From the above, the input rate ? is calculated by dividing M by a sensitivity S of the FM micro-gyro.

Abstract: A power conserving electronic circuit is provided having one or more main electronic devices or components powered by the output of a voltage regulator circuit. The voltage regulator is powered by a first power input, such as a battery. A real time clock circuit enables the voltage regulator, which, in turn, enables the main devices. The real time clock further provides an enable/disable output to a switch circuit whereby the real time clock circuit is powered by the output of the voltage regulator when the main devices are active and powered from the battery when the main devices are inactive.

Abstract: A system of terminating signals in a telecommunication system is disclosed. In one embodiment a line card comprises functional circuitry, line card connector contacts and a termination resistor. The functional circuitry is used to interface first type ports with second type ports. The line card connector contacts are adapted to be selectively coupled to a backplane of a chassis. The termination resistor is adapted to terminate signal lines when a jumper is coupled across select line card contacts.

Abstract: A system of terminating signals in a telecommunication system is disclosed. In one embodiment a line card comprises functional circuitry, line card connector contacts and a termination resistor. The functional circuitry is used to interface first type ports with second type ports. The line card connector contacts are adapted to be selectively coupled to a backplane of a chassis. The termination resistor is adapted to terminate signal lines when a jumper is coupled across select line card contacts.

Abstract: A power conserving electronic circuit is provided having one or more main electronic devices or components powered by the output of a voltage regulator circuit. The voltage regulator is powered by a first power input, such as a battery. A real time clock circuit enables the voltage regulator, which, in turn, enables the main devices. The real time clock further provides an enable/disable output to a switch circuit whereby the real time clock circuit is powered by the output of the voltage regulator when the main devices are active and powered from the battery when the main devices are inactive.

Abstract: A method for transmitting high-frequency current through a substrate is provided. The method comprises receiving the high-frequency current at a via passing through at least one conductive plane disposed within the substrate and coupled to the via with one or more tabs which span a gap between the at least one conductive plane and the via; and directing the high-frequency current along an uninterrupted path substantially on a surface of the via thereby bypassing the at least one conductive plane by conducting at least a portion of the high-frequency current between the one or more tabs.

Abstract: A circuit board includes at least one insulator layer and a plurality of conductors over which a plurality of signals is carried. A plurality of terminals is coupled to at least a subset of the plurality of conductors. A void is formed in the circuit board between at least two terminals.

Abstract: An apparatus to filter noise from being induced into a power line. In one a ferrite choke is disclosed that filters noise from being induced into a power line. The ferrite choke includes a tube of ferrite, a supply power line and a return power line. The tube of ferrite is made of a single piece of ferrite. The supply power line is received inside the tube of ferrite and the return power line is also received inside the tube of ferrite.

Abstract: A communication system includes primary and secondary interface cards. A switching circuit allows both of the interface cards to selectively communicate over a medium without inducing reflection. Further, an automatic detection system is provided to allow a management circuit to identify which interface card is coupled as the primary or secondary card.

Abstract: A circuit board includes at least one insulator layer and a plurality of conductors over which a plurality of signals is carried. A plurality of terminals is coupled to at least a subset of the plurality of conductors. A void is formed in the circuit board between at least two terminals.

Abstract: An apparatus to filter noise from being induced into a power line. In one a ferrite choke is disclosed that filters noise from being induced into a power line. The ferrite choke includes a tube of ferrite, a supply power line and a return power line. The tube of ferrite is made of a single piece of ferrite. The supply power line is received inside the tube of ferrite and the return power line is also received inside the tube of ferrite.

Abstract: A fault warning system controls light sources and a warning signal to provide an indication of fatal and non-fatal faults in a communication system. The circuitry uses a pull-down circuit in electrical communication with light and signal control circuits. The circuit can be operated to activate a first light emitting diode (LED) if an operational status of a monitored circuit is either fatal or non-fatal fault. The circuit can be operated to deactivate a second LED if an operational status of a monitored circuit is fatal, and the second LED remains active if the operational status of the circuit is a non-fatal fault.

Abstract: A system of terminating signals in a telecommunication system is disclosed. In one embodiment a line card comprises functional circuitry, line card connector contacts and a termination resistor. The functional circuitry is used to interface first type ports with second type ports. The line card connector contacts are adapted to be selectively coupled to a backplane of a chassis. The termination resistor is adapted to terminate signal lines when a jumper is coupled across select line card contacts.

Abstract: A communication system includes primary and secondary interface cards. A switching circuit allows both of the interface cards to selectively communicate over a medium without inducing reflection. Further, an automatic detection system is provided to allow a management circuit to identify which interface card is coupled as the primary or secondary card.

Abstract: A substrate having a conductive plane and a via passing through the conductive plane is provided. The conductive plane contacts the via to electrically interconnect the via and the conductive plane. A gap in the conductive plane separates a surface of the via from the conductive plane to provide an uninterrupted path for electrical current flowing substantially on the surface of the via.

Abstract: A fault warning system controls light sources and a warning signal to provide an indication of fatal and non-fatal faults in a communication system. The circuitry uses a pull-down circuit in electrical communication with light and signal control circuits. The circuit can be operated to activate a first light emitting diode (LED) if an operational status of a monitored circuit is either fatal or non-fatal fault. The circuit can be operated to deactivate a second LED if an operational status of a monitored circuit is fatal, and the second LED remains active if the operational status of the circuit is a non-fatal fault.