| 摘要 |
A computer is provided with an access control device 200, comprising a receiver 205a for receiving a transmission from outside the computer. Access to the computer is inhibited unless the control device receives such a transmission. The transmissions may be periodic and the receiver may be an RF signal receiver. The access control device may be implemented as a PCMCIA card. There is also disclosed a control system for monitoring movement of items of equipment comprising a database storing access data for people associated with such items and means for receiving information identifying the presence of equipment and personnel in a predetermined area. A processor determines, from the database, whether an identified person is authorised to be with that item of equipment. A security device is further disclosed comprising a first transmission means to communicate the status of the security device, an item of equipment or an associated person. A second transmission means has a shorter range than the first so that its transmission can only be detected in the vicinity of a defined area.
|
