Intrinsically safe telephone network

Details Intrinsically safe telephone network Intrinsically safe telephone network

1978-05-17

1980-07-22

Konick, Bernard

179 81R, H04M 118

Patent

active

042141273

ABSTRACT:
A telephone network which can be placed in a dangerous or explosive atmosphere is disclosed. The telephone network includes a manual exchange, one or more telephone sets and one or more limiter-repeater circuits connected with the telephone sets by telephone lines. The one or more telephone sets do not include any supply sources, but each include a solid-state amplifier which requires only a low supply voltage and has low energy dissipation. The solid state amplifier is supplied with operating voltage from supply sources in the exchange through the telephone line.

REFERENCES:
patent: 4064366 (1977-12-01), Wheatley et al.

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