A method for detecting unauthorized disconnection of remotely located electronic equipment which has existing data communication lines connecting the equipment to a network, said method comprising: selecting respective pairs of the existing data communication lines for associated pieces of monitored equipment so that each of said selected pairs of data communication lines forms a current loop through the associated pieces of monitored equipment, wherein said respective pairs of data communication lines are associated with different ones of the associated pieces of equipment; supplying a low DC current signal to each current loop so as to achieve continuous current flow through each current loop while each of said associated pieces of equipment is physically connected to said network via the data communication lines; and sensing said DC current signal in each of said current loops so as to detect a change in current flow indicative of disconnection of one of said pieces of associated equipment. view more

The method as defined in claim 14 wherein said existing data communication lines comprise 10BaseT wiring.