Terminal equipment for telecommunications and information proces

Details Terminal equipment for telecommunications and information proces Terminal equipment for telecommunications and information proces

1996-12-03

1999-10-19

Isen, Forester W.

Telephonic communications

Subscriber line or transmission line interface

Protective circuit

379398, 379413, 333 22R, H04M 100

Patent

active

059701382

ABSTRACT:
Terminal equipment for telecommunications and information processing with improved electromagnetic compatibility (EMC). The equipment has a human-machine interface (HMI), a metallic telecommunications interface (TCI), and optionally a power line interface (PLI). First common-mode rejection filters consisting of common-mode choke coils and shunt capacitors are placed at the HMI interface of the equipment, while second common-mode rejection filters consisting of the same components are placed at the TCI and PLI interfaces. High-frequency junction points of the first and second common-mode rejection filters are interconnected with a bypass circuit. Being isolated from the signal ground and frame ground of the equipment, the bypass circuit is an independent non-grounded circuit. Such internal structure makes it possible to reject noise signals induced by an external noise source and also to suppress spurious radiation from an internal noise source.

REFERENCES:
patent: 3697896 (1972-10-01), Sarkozi et al.
patent: 3766337 (1973-10-01), Duimelaar
patent: 3942168 (1976-03-01), Whyte
patent: 5642412 (1997-06-01), Reymond
patent: 5642416 (1997-06-01), Hill et al.
patent: 5659273 (1997-08-01), Harpham

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