1984-01-16
1986-05-13
Dwyer, James L.
1791753F, 179179, H04M 124
Patent
active
045888620
ABSTRACT:
A visual display network interface for placement between the incoming telephone network access line to a structure and user telephone equipment within the structure for indicating the operational status of the network access line and the user equipment includes a modular housing disposed between the network access line and the user telephone equipment wherein the housing includes an electrical circuit providing a pair of light-emitting diode indicators which are operable in either an illuminated or an unilluminated mode depending upon the status of the network access line and the telephone equipment within the premises. The circuit arrangement is designed to indicate whether or not continuity of the network access line exists as well as where a fault may be located if the user telephone equipment fails to operate properly. The user is able to determine which or both of the light-emitting diodes are illuminated and from that determination the user is able to indicate what portion of the overall system, if any, is malfunctioning. For example, if one of the two sides of the incoming network access line has lost continuity, a first one of the light-emitting diodes will not illuminate. Consequently, an unilluminated condition on this particular light-emitting diode will immediately signify to the user of the equipment that there is a loss of continuity in that network access line. Similarly, an unilluminated condition on the other light-emitting diode will indicate a fault with the user telephone equipment.
REFERENCES:
patent: 4197435 (1980-04-01), Jackson et al.
patent: 4369341 (1983-01-01), Ahuja
patent: 4388501 (1983-06-01), Ahuja
patent: 4413163 (1983-11-01), Basini
"Project of the Month-Tri-State LED Demonstrator", Popular Electronics, Mims, 1979, p. 102.
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