Abstract: A packet distribution system includes: a first transfer device that is placed on a boundary of a core network and near first and second terminal devices; a second transfer device that is placed on the boundary of the core network and near a content distribution device; and a control device that, when a first content packet is distributed to the first terminal device, a distribution request packet is transmitted from the second terminal device, and a second content packet newly distributed from a content distribution device to the second terminal device is detected by the second transfer device, causes the second transfer device to abandon the second content packet based on control information included in the second content packet, and causes the first transfer device to copy the first content packet distributed to the first terminal device, to the second terminal device.

Abstract: A network monitoring control apparatus includes: a traffic information acquisition unit to acquire traffic information of a network component included in a network; a decision information switching unit to set decision information for the network component based on a comparison result between the traffic information and one of a congestion decision threshold and a congestion recovery decision threshold of the network component; and a management information acquisition unit to acquire management information of the network component based on the decision information.

Abstract: A packet distribution system includes: a first transfer device that is placed on a boundary of a core network and near first and second terminal devices; a second transfer device that is placed on the boundary of the core network and near a content distribution device; and a control device that, when a first content packet is distributed to the first terminal device, a distribution request packet is transmitted from the second terminal device, and a second content packet newly distributed from a content distribution device to the second terminal device is detected by the second transfer device, causes the second transfer device to abandon the second content packet based on control information included in the second content packet, and causes the first transfer device to copy the first content packet distributed to the first terminal device, to the second terminal device.

Abstract: A network monitoring control apparatus includes: a traffic information acquisition unit to acquire traffic information of a network component included in a network; a decision information switching unit to set decision information for the network component based on a comparison result between the traffic information and one of a congestion decision threshold and a congestion recovery decision threshold of the network component; and a management information acquisition unit to acquire management information of the network component based on the decision information.

Abstract: Disclosed is a network management system for performing automatic setting of agent addresses to thereby improve operability and maintainability of network management. An agent node has an access list for registering an address of a partner to be permitted to make access and performs communication by a network management protocol only with the partner registered in the access list. A plurality of communication nodes perform communication by the network management protocol with the agent node. A main node controls automatic registration of communication node addresses in the access list of the agent node to allow a manager side to manage the addresses to be registered in the agent node.

Abstract: A method of synchronizing databases of a plurality of monitoring devices in a communications system having a communications device, a first monitoring device and a second monitoring device for monitoring the communications device and a network connecting these devices. Each monitoring device accommodates a database. The first monitoring device transmits a control command with a network address of the first monitoring device to the communications device. The communications device transmits the received network address to the second monitoring device. The first monitoring device updates registered data recorded in the database accommodated by the first monitoring device. The second monitoring device transmits a read-out request for reading out registered data which is altered by the updating operation and recorded in the database accommodated by the first monitoring device, to the first monitoring device by using the network address of the first monitoring device received from the communications device.

Abstract: In a supervisory control system where an upper supervisory control terminal supervises and controls transmitting devices, the upper supervisory control terminal has two supervisory states. The transmitting devices store state change information to be transmitted to the upper supervisory control terminal with an issue of the information being suppressed when the upper supervisory control terminal is in one supervisory state, and merge the state change information into a single message to be transmitted when the upper supervisory control terminal shifts to the other supervisory state.

Abstract: A method of synchronizing data bases of a plurality of monitoring devices in a communications system having a communications device, a first monitoring device and a second monitoring device for monitoring the communications device and a network connecting these devices, in which each of the monitoring devices accommodates a database.

Abstract: In a supervisory control system where an upper supervisory control terminal supervises and controls transmitting devices, the upper supervisory control terminal has two supervisory states. The transmitting devices store state change information to be transmitted to the upper supervisory control terminal with an issue of the information being suppressed when the upper supervisory control terminal is in one supervisory state, and merge the state change information into a single message to be transmitted when the upper supervisory control terminal shifts to the other supervisory state.