Interface circuit for transmitting keycodes to a centrex

Abstract

An interface circuit for transmitting data messages between a remotely located attendant console and a CENTREX equipped central office exchange. The interface circuit includes control and sense decoders connected to control and sense fields. Receiving circuit connected to the attendant console receive data messages transmitted from the attendant console. A controller connected to the receiving circuit process the received data messages, storing the data messages in a temporary memory. Sequential memory connected to the temporary memory receive and store in sequential order the data messages after they are processed. The sequential memory further includes memory enabling circuit connected to the control and sense decoder. In response to the controller signaling the CENTREX that data messages have been loaded in the sequential memory, the CENTREX sends an enabling signal to the memory enabling circuit transferring the data messages out of the sequential memory in a first in first out order to the CENTREX via the control and sense decorder and the sense field.