Abstract: A mobile device includes: a processor coupled to a memory, configured to: detect, within range of a first cell belonging to a first network that is a roaming public land mobile network, a second cell belonging to a second network that is a contracted public land mobile network or a public land mobile network equivalent to the contracted network, perform determining, when detecting a shared cell belonging to the first and second networks, whether or not a wireless quality value of the shared cell exceeds a first given value and is not more than a second given value, define out of range after a lapse of a given time since a wireless quality value of the first cell within range becomes not more than the first given value, and select the shared cell for switching before defining the out of range based on a result of the determining.

Abstract: The access point used in the wireless LAN system acquires, from a network, an IP address of a management device that holds a list of wireless LAN control devices to each of which the access point can be subordinate, in response to an event start input, acquires the list from the management device via the network by using the IP address of the management device, and accesses at least one of the wireless LAN control devices registered in the list via the network and determines a wireless LAN control device to which the access point should be subordinate, based on a response sent from the at least one of the wireless LAN control devices.

Abstract: To provide a network monitoring system extracting the performance measurement data while eliminating the performance measurement data that is not effective for improvement of the network performance on the basis of a predetermined extraction condition and presenting the extraction result to the operator. The network monitoring system includes extraction condition presenting means for presenting a predetermined extraction condition indicating a relationship between performance measurement data of each device configuring the network and a status of a device to be eliminated upon extracting said performance measurement data; and performance measurement data extracting means for eliminating the performance measurement data that is measured under a status of the device to be eliminated on the basis of an extraction condition indicated by said extraction condition presenting means and extracting the performance measurement data that is effective for improvement of the network performance.

Abstract: The access point used in the wireless LAN system acquires, from a network, an IP address of a management device that holds a list of wireless LAN control devices to each of which the access point can be subordinate, in response to an event start input, acquires the list from the management device via the network by using the IP address of the management device, and accesses at least one of the wireless LAN control devices registered in the list via the network and determines a wireless LAN control device to which the access point should be subordinate, based on a response sent from the at least one of the wireless LAN control devices.

Abstract: To provide a network monitoring system extracting the performance measurement data while eliminating the performance measurement data that is not effective for improvement of the network performance on the basis of a predetermined extraction condition and presenting the extraction result to the operator. The network monitoring system includes extraction condition presenting means for presenting a predetermined extraction condition indicating a relationship between performance measurement data of each device configuring the network and a status of a device to be eliminated upon extracting said performance measurement data; and performance measurement data extracting means for eliminating the performance measurement data that is measured under a status of the device to be eliminated on the basis of an extraction condition indicated by said extraction condition presenting means and extracting the performance measurement data that is effective for improvement of the network performance.

Abstract: An order wire monitoring method monitors form a monitoring control terminal a quality of an order wire line which couples transmission apparatuses via multiplexed lines which multiplex and transmit main and order wire signals. A transmission apparatus which is to transmit test data and a transmission apparatus which is to receive test data are specified from the monitoring control terminal, and the test data are transmitted from a specified transmitting apparatus to the order wire line in response to a start of test instructed from the monitoring control terminal. The monitoring control terminal monitors the quality of the order wire line based on information received from the specified receiving apparatus via the specified transmitting apparatus.