Data synchronization circuit

摘要

A data synchronization circuit for use in an automatic identification of outward dialing system (AIOD). The present invention automatically synchronizes streams of binary data sent as lengthy messages between a private automatic branch exchange (PABX) and a telephone switching center. The binary information transmitted to the switching center consists of the calling subscriber's identity within the PABX and the identity of the trunk circuit connecting the PABX to switching center. This information is transmitted in two-out-of-five code. Synchronization is provided by controlling the output of an included clock in response to received binary state changes.