H - Electricity – 04 – M
Patent
H - Electricity
04
M
H04M 11/02 (2006.01)
Patent
CA 2101080
A B S T R A C T A method for signalling/communication within an entrance telephone system or similar, and a system utilizing the method, which facilitates selective communication from an entrance center or central unit (1) to desired and addressed substation (5, 5', 5") via a loop including at least two conductors, and which also facilitates entrance lock opening or similar function from such a substation (5, 5', 5"). After approved addressing operation of the central unit (1) performed by a visitor, the central unit (1) performs feed of work current to the loop (2, 2') joining the central unit (1) and connected substations (5, 5', 5"), and transmits an address code unique for addressed substation (5, 5', 5"). By means of a signal detecting means (6, 6', 6") only addressed substation (5, 5', 5") then establishes a galvanical connec- tion with the loop (2, 2') and the central unit (1). The central unit (1) performs thereafter generation of a ring signal, detection of "hook off" or other status or signalling changes, and on detection of not completed reply, or termina- ted entrance telephone communication/function, the feed of work current to the loop is interrupted. Address information from the central unit (1) is preferably transferred using a signalling type different from the signalling type whereby substations (5, 5', 5") connected to the loop (2, 2') can influence the central unit (1) during an established connec- tion in order to initiate entrance lock opening or other function.
Marks & Clerk
Trell Anders Edvard
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