Abstract: A data center comprises a first gateway that connects with a terminal using a VPN (Virtual Private Network) through a wireless LAN and a first wide area network, a second gateway that connects to a second wide area network (WAN2), a virtual network connected to the first gateway and the second gateway; and a function block that is provided between the first gateway and the second gateway and that performs filtering of at least one of a packet input from the first wide area network side and a packet input from the second wide area network.

Abstract: Event-related data based on an image that has been captured is generated. Coverage information relating to imaging range is compared to the event-related data. The cameras that can capture an image of the event, based on a comparing result, are listed so that an operator can select one of the listed cameras.

Abstract: A network element provides an interworking function between plural networks. The network element includes a first network forwarding function block for forwarding packets in a first network, a first network control function block for controlling the first network forwarding function block, a second network forwarding function block for forwarding frames along a connection-oriented path in a second network, and a second network control function block for controlling the second network forwarding function block.

Abstract: In a noise shaper comprising first and second cascaded integrators, a quantizer receiving an output signal of the second integrator, and a feedback path for feeding back an output of the quantizer to each of the first and second integrators, the first integrator includes an adder having a first input receiving art input signal applied to the first integrator, a delay circuit receiving an output of the adder to output a one-sample-delayed signal, and a multiplying circuit having an input connected to an output of the delay circuit for multiplying the one-sample-delayed signal outputted from the delay circuit, by a positive coefficient "0.999". An output of the multiplying circuit is connected to a second input of the adder. An output of the delay circuit constitutes the output of the first integrator.