Tamper-proof two-way cable system

Details Tamper-proof two-way cable system Tamper-proof two-way cable system

1975-08-04

1977-01-11

Stewart, David L.

Telegraphy

Systems

Printing

178DIG13, 179 15BD, 325308, H04J 308

Patent

active

040028437

ABSTRACT:
There is disclosed a two-way cable system in which the deliberate introduction of continuous upstream message interference at any subscriber terminal does not destroy the efficacy of the system. Each subscriber terminal is coupled through an interface unit to the cable, and the interface unit permits upstream transmission of a message from the respective terminal only following recognition by the interface unit of the downstream transmission of the address of the respective terminal. Because the interface units are located off the premises of the subscribers, a deliberately introduced interference signal on a subscriber line cannot reach the cable except during the respective time slot of the subscriber.

REFERENCES:
patent: 3647976 (1972-03-01), Moses
patent: 3769579 (1973-10-01), Harney
patent: 3796829 (1974-03-01), Gray

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