Patent ID: 7483382

Claim:
A monitoring device for a multichannel digital switch, the switch including a connecting interface for connecting physical connection circuits to a transmission medium, defining at least one of source and destination ports, the connecting interface including a physical layer and a logical layer, and a processing unit for carrying out selective switching of multifield data cells between the different ports, the monitoring device comprising: a probe unit coupled selectively to the connecting interface, configured to separately observe data transmitted from the physical layer to the logical layer, and data transmitted from the logical layer to the physical layer; and a monitoring unit configured to analyze contents of at least part of the data cells probed by the probe unit, to generate a warning message to the logical layer when the part analyzed does not meet a selected condition and to make the warning message compatible with an associated port of the logical layer, to output the warning message to the logical layer, and to trigger rejection of a cell probed by the probe unit upon transmission of the warning message.