DEVICE FOR SECURELY MONITORING DATA SWITCHING

摘要

A multichannel digital switching unit comprises a connection interface (5) between circuits (2, 7) which provide the physical links to a transmitting environment defining the ports (3); and a processing unit (4, 12) which switches multi-field data frames between the different ports. A frame monitoring device comprises a probe module (6) which is selectively linked to the connection interface (5) and a surveillance module (15-18) which has means for analysing the contents of at least a part of each data frame processed by the probe (6) and generating a warning signal when the part that is analysed fails to fulfil a chosen criterion.