Rural interface device

Details Rural interface device Rural interface device

H - Electricity

04

M

379/14

H04M 3/02 (2006.01) H04Q 5/02 (2006.01)

Patent

CA 1202740

ABSTRACT OF THE DISCLOSURE Individual line service features on a multi-party two-wire telephone network are provided by apparatus that interfaces individual subscriber stations with the network. The apparatus includes a current sensor for detecting on hook and off hook modes of its station and a voltage sensor for determining the availability of the network to establish a bidirectional communication path with the station. Control logic circuitry responsive to the sensors sets the apparatus to an active state when the station is off hook and the network is available and to a nonactive state when the network is not available. Signal generators that are operably responsive to the control logic produce tone signals that indicate such states. A relay operated by the control logic circuitry in response to the status of the apparatus then connects its station across the network in the active state and disconnects the station in the nonactive state. Ringing signals on the network are detected and within one complete ring cycle are decoded. This ensures privacy since each apparatus is respon- sive only to its own code. Ringing voltage is then applied across the ringer of the called station. A break-in feature permits intruding on a conversation in case of an emergency, but surreptitious eavesdropping is prevented by an intrusion signal that is placed on the network for all stations to hear. Revertive calls between calling and called stations on the same network are performed by dialling the required number followed by a hook flash at the calling station which temporarily places the calling station in the nonactive state to free the network for ringing the called station until it goes off hook. Should the network be determined as being busy, the station is returned to its on hook mode and a previously charged capacitor is dis- charged through its ringer to provide an audible alarm when the network later becomes available for use.

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