| 摘要 |
A system for supervision of objects, which gives alarm if the original connection/link to the supervised object is broken, and which can transmit alarm and position indication/information even if the first original connection/link with the mobile object is lost. The system includes a data and telecommunication network, an alarm server which, is connected/linked to at least one mobile unit by a first ordinary communication connection/link. Alarm server is arranged to regularly poll the status of the mobile unit and is arranged to transmit an alarm to at least one alarm receiver when the alarm server does not receive status answer from the mobile unit. The system may include a second communication connection/link arranged to connect/link the mobile unit and the alarm server, and at which the system is arranged to provide communication between the mobile unit and the alarm server, the second connection/link, when the first connection/link is broken. |
