Patent ID: 6763108
Filing Date: 2004-07-13
Classification: H04M

Abstract:
A telephone line pair interface circuit comprising:at least two connection terminals; a plurality of multiple contact switching relays, each of said relays having a first and a second contact connection condition and at least one activating element controllable by a microcomputer having electronic memory means for changing said relay between said first and said second contact connection conditions; a capacitor; means incorporating said capacitor for snubbing inductive residuals from the line pair; means incorporating said capacitor for monitoring an electrical signal flow on telephone line pair before disrupting the signal flow; means incorporating said capacitor for detecting a telephone ring signal; and means for simulating a large inductance to carry loop current from the line pair once a communication connection is established on the opposite end of the telephone line pair, wherein said connection terminals, said snubbing means, said monitoring means, said ring signal detecting means and said simulated inductance means are so arranged constructed and interconnected as to selectably provide a predetermined selection of any of said means electrically connected to said connection terminals in dependence upon the contact connection conditions of said plurality of relays.