1
John A Oldfield, H Charles Sabry, Adrian D Jones: Tamper detectable electronic security package. Northern Telecom, J E Moorhouse, April 9, 1996: US05506566 (82 worldwide citation)

An intrusion detection electronic circuit package, includes a containment wall in combination with first and second transmission lines being organized in patterns spaced adjacent one another. Electronic circuitry, residing within the containment wall, includes a transmitter for transmitting signals ...


2
Bruce L Townsend, Stephen R Saunders: Hands free telecommunication apparatus and method. Northern Telecom, J E Moorhouse, March 24, 1992: US05099472 (75 worldwide citation)

In a hands free communications terminal apparatus, a loudspeaker and a microphone are permitted to be simultaneously active. A controller monitors signals in transmit and receive paths to direct operations of transversal filters to provide two echo canceller functions, one for the microphone and one ...


3
Sergiu Bulan, Johannes L Holt: Power feed circuit for digital communications terminal equipment. Northern Telecom, J E Moorhouse, February 18, 1992: US05089927 (49 worldwide citation)

Integrated Services Digital Network (ISDN) terminal equipments (TEs) are remotely powered from a central source via line interface circuits. One function of the line interface circuit is that of conducting energizing direct current for the associated telecommunications terminal equipment while provi ...


4
Alan P Westfall: Push and rocker action switch. Northern Telecom, J E Moorhouse, March 31, 1987: US04654488 (34 worldwide citation)

A push and rocker action switch includes a pair of switchable contacts, either of which is switchable in response to a rocker motion of a depressible actuating member, and both of which are switchable at the same time in response to an overall push depression of the actuating member. The actuating m ...


5
Chao Jan Cheng, John R Donak, Samir E Ahad: Call progress signal monitor and method for telephone systems. Northern Telecom, J E Moorhouse, July 9, 1985: US04528664 (33 worldwide citation)

A call progress signal monitor includes a translation circuit for generating data signals indicative of predetermined signal characteristics in a TDM PCM signal channel. A processor implemented detection circuit is responsive to the data signals for detecting call progress tones and silence. The tra ...


6
Andrew Jarosz, Kent Callahan: Transformer and ferrite core structure therefor. Northern Telecom, J E Moorhouse, April 7, 1987: US04656450 (27 worldwide citation)

A ferrite core structure for line circuit transformers includes a ferrite spindle for receiving transformer windings, thereby avoiding the need for a separate bobbin as used in conventional line circuit transformers. The ferrite core structure includes a ferrite base for supporting the ferrite spind ...


7
Stanley D Rosenbaum, Martin R Handforth: Active impedance line feed circuit. Northern Telecom, J E Moorhouse, April 30, 1985: US04514595 (25 worldwide citation)

A line circuit includes tip and ring voltage amplifiers each having an output resistively connected via tip and ring feed resistors to tip and ring leads in a telephone line. The tip and ring feed resistors have closely matched ohmic values, and are part of a resistance network which also includes f ...


8
Jerzy W Miernik: Machine method for determining the eligibility of links in a network. Northern Telecom, J E Moorhouse, George MacGregor, May 6, 1997: US05627971 (25 worldwide citation)

The eligibility of all bidirectional links interconnecting a plurality of nodes in a network is determined based on the free bandwidths in both directions of the links and the bandwidth required for transmitting messages between a source node and a destination node in the network. The determination ...


9
Ronald George McGrath, George Howard Wright: Subscriber loop verification device and method. Northern Telecom, J E Moorhouse, October 18, 1977: US04054759 (22 worldwide citation)

A subscriber loop test device is connected across a subscriber loop adjacent a subscriber equipment and remote an associated switching office. The subscriber loop test device includes a relaxation oscillator and a connection circuit responsive to a predetermined high voltage applied at the switching ...


10
Robert S Morley, Roland A Smith, Paul D Sayre: Electronic systems and effective reduction of electromagnetic interference energy propagation from electronic systems. Northern Telecom, J E Moorhouse, February 26, 1991: US04996684 (21 worldwide citation)

An electronic system includes at least one element which is operative in response to clock signal pulses, of less than a maximum frequency of occurrence, from a clock signal source. A dither means is connected to the clock signal source for causing the frequency of occurrence to be varied such that ...