Patent ID: 8964534
Filing Date: 2015-02-24
Classification: H04B,H04L

Abstract:
1. A monitor and control device comprising: a monitor and control unit that transmits to a monitor target device a monitor and control signal through a monitor and control signal path in a case of a malfunction occurred in a main signal path, and transmits to the monitor target device the monitor and control signal through the main signal path in a case of a malfunction occurred in the monitor and control signal path, the monitor target device including: the monitor and control unit transmits a polling request to the monitor target device through the monitor and control signal path, and the monitor and control unit transmits a monitor line switching request to the monitor target device through the main signal path in a case of not receiving a polling response from the monitor target device within a predetermined time after transmitting the polling request, the monitor and control unit receives, from the monitor target device, a monitor line switching response as a response to the monitor line switching request, the monitor line switching response indicating that a port has been changed from the second connection path to the first connection path, the port being used for transmission and reception of the monitor and control signal.