Tempo Research Corporation

Integrated Switching Supplies, Inc.

Robert G Crick

Michael J Dewey

Larry P Jamison

Telecommunications line noise measurement device

A device for measuring and isolating noise-creating imbalances in a paired telecommunications line has an internal circuit which includes a pair of substantially balanced ac current outlet pathways and a pair of high voltage bias pathways in parallel. An oscillator in the circuit generates a low voltage longitudinal ac signal that is transmitted across the balanced pathways and a dc power source simultaneously generates a high voltage dc signal that is transmitted across the high voltage bias pathways. Both signals are further transmitted to the paired line where it is the function of the high voltage dc signal to punch through any concealed faults in the line. In contrast, the low voltage ac signal travels the length of each conductor in the line and returns to the circuit as a metallic voltage signal. If there is any imbalance between the two conductors, the metallic voltage signals for the two conductors will be different. Accordingly, a differential amplifier in the circuit measures this difference and displays it in units of noise or balance.

Apparatus and method for detecting and isolating noise-creating

A device for measuring and isolating noise-creating imbalances in a paired telecommunications line has an internal circuit which includes a pair of substantially balanced ac current outlet pathways in parallel, a differential amplifier connected to a pair of voltage inlet pathways, and an oscillator to supply longitudinal alternating current to the paired line across the balanced pathways. A longitudinal alternating current signal is sent from the oscillator to each conductor of the line across the outlet pathways, travels the length of each conductor and returns to the inlet pathways as a metallic voltage signal. If there is any imbalance between the two conductors, the metallic voltage signals for the two conductors will be different. Accordingly, the differential amplifier measures this difference and it is displayed in units of noise or balance. The outlet pathways further function to minimize the amount of dc loop current drawn from the paired line and a ground pathway is provided to substantially minimize low frequency ac power influence current flow to ground. The oscillator supplies alternating current for testing, so the device does not use the dc current of the loop being tested and is, therefore, applicable to testing either wet or dry paired lines.

Noise measurement in a paired telecommunications line

The distinguishing feature of so-called no break or non-interrupting power supplies over ordinary standby or emergency power systems is that no supply interruption (even momentary) occurs when the commercial power source fails or when commercial power again becomes available. This invention comprises a non-interrupting modular power supply system which can be configured for loads of from 15 to 100, watts or for 75 to 500 watts, respectively. The system combination supplies single or multiple regulated DC outputs meeting the requirements of the equipment being operated. A source of AC power is converted to DC for utilization by a load and for charging a back-up battery. When the source of AC power fails, the battery supplies power to the load. Means are provided to monitor the battery voltage to control its charging.

Growing community of inventors

San Diego, CA, United States of America

Robert G Crick