Telephone set-computer terminal assembly with a single decimal keyboard and a switchable local power supply
First Claim
1. A telephone set-computer terminal assembly comprisinga telephone interface is connected to a control keyboard, to a telephone line through first switch means and to a telephone handset, the telephone interface generating and emitting signals over the telephone line including dialling signals selected via the control keyboard, the telephone interface further including means for controlling transmission between the line and the handset,man-machine interface equipment having a local power supply connected to a main power supply through an insulating transformer in which assembly power for the telephone interface is provided at one time by the telephone line and at another by the local power supply,first galvanic insulation means permanently providing insulation between the local power supply and the telephone line and the telephone interface being connected to the man-machine interface equipment by message transmission channels comprising second galvanic insulation means.
1 Assignment
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Accused Products
Abstract
A telephone set-computer terminal assembly is provided having a single decimal keyboard and a switchable local supply. The telephone interface, connected to the decimal keyboard, is supplied by its line input through a switching relay which connects it at one time to a local power supply of the man-machine interface equipment and at another to the line through a switch depending on whether the line is unlooped or not. The telephone interface is connected to the man-machine interface equipment by message communication lines comprising a galvanic insulation device.
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Citations
6 Claims
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1. A telephone set-computer terminal assembly comprising
a telephone interface is connected to a control keyboard, to a telephone line through first switch means and to a telephone handset, the telephone interface generating and emitting signals over the telephone line including dialling signals selected via the control keyboard, the telephone interface further including means for controlling transmission between the line and the handset, man-machine interface equipment having a local power supply connected to a main power supply through an insulating transformer in which assembly power for the telephone interface is provided at one time by the telephone line and at another by the local power supply, first galvanic insulation means permanently providing insulation between the local power supply and the telephone line and the telephone interface being connected to the man-machine interface equipment by message transmission channels comprising second galvanic insulation means.
Specification