Patent ID: 7388876

Claim:
Data transmission equipment for use as a constituent of a multiplex transmission network, comprising: a reception unit which receives data; a control information extraction unit which extracts control information from said data received by the reception unit; a data acquisition unit which determines whether or not said control information includes a request for storage of said data, and acquires the data when said control information includes the request for storage of the data; a data storage unit which stores the data acquired by the data acquisition unit; a data erasing unit which determines whether or not said control information includes a request for erasing of said data stored in said data storage unit, and erases the data from the data storage unit when said control information includes the request for erasing of the data; and a data lock unit which determines whether or not said control information includes a request for locking said data stored in said data storage unit, and locks the data stored in said storage unit so that said stored data is protected against unintended erasing when said control information includes the request for locking the data.