HP 10Base-T Hub 24M Manual page 69

Configuration Reference
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Link status. Indicates whether the Link Beat signal has been detected
on the hub. Settings can be:
Detected. Indicates the port has sensed a device that supports link beat.
Not Detected. Indicates the port has not sensed a device that supports
link beat.
Last Heard Source Address. Shows the MAC address of the device that
sent the last packet to the port. Addresses are shown only for active ports.
Security Information (Violation on the Browser Interface). Indi-
cates whether the port's security rules have been violated. Settings can be:
No violation. Indicates no unauthorized address has attempted to
connect to the port.
Violation. Indicates a port intrusion has occurred on the port.