CONNECTOR TERMINAL DIAL REPULSER

• US 3,798,379 A
• Filed: 09/22/1971
• Issued: 03/19/1974
• Est. Priority Date: 09/22/1971
• Status: Expired due to Term

• Current Assignee: Dell Royce Brooks
• Original Assignee: Dell Royce Brooks
• Inventors: Brooks, Dell Royce
• Primary Examiner(s): Brown, Thomas W.
• Application Number:
  US05/182,890
• Time in Patent Office: 909 Days
• Field of Search: 179/16EA,16E,16F,41A,41R,18AH,18B,18BE,18AD
• US Class Current: 379/341
• CPC Class Codes: H04Q 1/32 using trains of dc pulses H04Q1/39 takes precedence
• CPC Class Codes: H04Q 3/625 Arrangements in the private branch exchange

Abstract

A trunk circuit interface between a connector terminal of a conventional telephone switching system and a plurality of dial access stations forward of the connector terminal. A conventional repeating coil and a plurality of relays respond to ringing on the connector terminal by providing a ring-trip loop closure and a path for receiving further dial pulses. Dial pulses actuate the relays to provide loop pulsing to the forward equipment. When enough pulses have been received to select a particular station in the forward equipment, ground is provided back to the circuitry of the invention to inhibit further pulses and close a tip and ring transmission path between the output of the connector terminal and the selected station within the forward equipment.

Claims

1. A dial repulser circuit for directing dial pulses from a telephone central office connector terminal to a dial pulse selectable station within forward equipment, comprising;

a repeating coil having a plurality of input terminals connected to the output of said connector terminal and also having a plurality of output terminals;

a first relay connected to one of said output terminals of said coil and responsive to a.c. ringing current thereon for closing a conductive path through said coil and tripping the ring current;

a second relay responsive to operation of said first relay for closing a conductive loop to the forward equipment;

a current generator responsive to dial pulses for producing corresponding current pulses;

a third relay responsive to operation of said first relay for connecting one of said output terminals of said coil to said current generator;

a fourth relay connecting to said current generator having a normally closed contact in said conductive loop for providing loop interruption in response to current pulses;

a fifth relay responsive to connection to said conductive loop to a station in said forward equipment for closing a transmission path from said connector to the station in said forward equipment.

2. A dial repulser circuit as set forth in claim 1 wherein said current generator includes a transistor.

3. A dial repulser circuit as set forth in claim 1 which also includes means responsive to a release signal from the forward equipment for releasing said first, second, third and fifth relays.

4. A dial repulser circuit as set forth in claim 1 which also includes:

means responsive to a busy condition within said forward equipment for inhibiting the operation of said first relay and preventing the ringing current from being tripped.