Abstract: An information processing device performs software license authentication while sharing the license between an operational system and a standby system in a closed network. A license file and a license key are installed in the operational system. License synchronization starts between the operational system and the standby system. When the operational system fails, the operational system is separated from the closed network, and when a different device is provided, license synchronization is performed between the different device serving as a new standby system and a new operational system (old standby system). When the standby system fails, the standby system is separated from the closed network, and license synchronization is performed between a different device serving as a new standby system and the operational system. A device which retains the license monitors whether or not an unauthorized use of the license is conducted in the closed network.

Abstract: An information processing device performs software license authentication while sharing the license between an operational system and a standby system in a closed network. A license file and a license key are installed in the operational system. License synchronization starts between the operational system and the standby system. When the operational system fails, the operational system is separated from the closed network, and when a different device is provided, license synchronization is performed between the different device serving as a new standby system and a new operational system (old standby system). When the standby system fails, the standby system is separated from the closed network, and license synchronization is performed between a different device serving as a new standby system and the operational system. A device which retains the license monitors whether or not an unauthorized use of the license is conducted in the closed network.

Abstract: A method for processing data received from at least one of VLANs, the method including: obtaining, based on a VLAN tag included in a MAC header of a MAC frame received from the VLAN and a first destination IP address included in an IP header of the MAC frame, a second destination IP address, changing the first destination IP address of the IP header to the second destination IP address, and generating an IP packet by deleting the MAC header from the MAC frame.

Abstract: The access server receives an authentication packet including an authentication result, a port change setting information, a port change time, a filtering setting information and a filtering time from the authentication server. The access server stores the respective information in the authentication packet into a memory. The access server refers to the memory, and in the case where the port change setting information on an arbitrary user identifier is set to perform port change, when it becomes the port change time, the access server changes the output destination of a packet from a user terminal to, for example, a proxy server B from a proxy server A. Besides, in the case where the filtering setting information on an arbitrary user identifier is set to perform filtering, when it becomes the filtering start time, the access server performs filtering on the port to which the user terminal is connected.

Abstract: Receiving terminals joining a multicast group are divided into sub groups and rekeying is performed only on the sub group which one of the receiving terminals has left. An encryption key management system having an encryption method is provided in which a multicast server is connected via an IP network, a seed node carries out encryption multicast communications among receiving terminals by using an encryption key, the receiving terminals are properly divided into the sub groups, the single encryption key is used for data distribution of the multicast server, and the number of decoding keys is equal to the number of divided sub groups.

Abstract: In a WDM type PON system, each ONU comprises an optical transmitter capable to transmit optical signals with variable wavelengths, an optical signal receiving filter variable its receiving wavelength, and a control unit. An OLT selects in response to a wavelength allocation request from each ONU, a transmitting wavelength and a receiving wavelength out of currently free wavelengths and allocates these wavelengths to the requester ONT. The control unit of the ONU switches the transmitting wavelength of the optical transmitter and the receiving wavelength of the optical signal receiving filter to the wavelengths specified in a response message from the OLT and starts data communication.

Abstract: In a WDM type PON system, each ONU comprises an optical transmitter capable to transmit optical signals with variable wavelengths, an optical signal receiving filter variable its receiving wavelength, and a control unit. An OLT selects in response to a wavelength allocation request from each ONU, a transmitting wavelength and a receiving wavelength out of currently free wavelengths and allocates these wavelengths to the requester ONT. The control unit of the ONU switches the transmitting wavelength of the optical transmitter and the receiving wavelength of the optical signal receiving filter to the wavelengths specified in a response message from the OLT and starts data communication.

Abstract: A spanning tree is formed for each of MST (Multiple Spanning Tree Protocol) instances defined by a VLAN ID and a COS value. Each terminal apparatus specifies the COS value corresponding to the TCP/UDP port number of a Ethernet frame to be transmitted, based on a conversion table indicating the correspondence of a TCP/UDP port number to a COS value and sets the specified COS value to the header of the Ethernet frame. Each of bridges in the transit network specifies the MST instance identifier of a received frame based on a conversion table indicating the correspondence of the MST instance identifier to the combination of a VLAN ID and a COS value and forwards the received frame in accordance with the spanning tree having the specified MST instance.

Abstract: A packet forwarding apparatus enabling selective provider type access service in a mobile communication network, including a first group of line interfaces connected to routers deployed to service areas of a mobile network, a second group of line interfaces connected to the Internet or to routers belonging to different ISP networks, an ISP management table indicating correspondence of domain name of each ISP networks to an authentication server address, and a controller that identifies, upon receiving from a mobile terminal a request to connect to one of said ISP networks, the domain name of the ISP network from a user ID in the request, transmits an authentication request including the user ID and password specified in said request to an authentication server associated with the ISP network, based on said ISP management table, and notifies the mobile terminal of a result of authentication by said authentication server.

Abstract: In a WDM type PON system, each ONU comprises an optical transmitter capable to transmit optical signals with variable wavelengths, an optical signal receiving filter variable its receiving wavelength, and a control unit. An OLT selects in response to a wavelength allocation request from each ONU, a transmitting wavelength and a receiving wavelength out of currently free wavelengths and allocates these wavelengths to the requester ONT. The control unit of the ONU switches the transmitting wavelength of the optical transmitter and the receiving wavelength of the optical signal receiving filter to the wavelengths specified in a response message from the OLT and starts data communication.

Abstract: In a WDM type PON system, each ONU comprises an optical transmitter capable to transmit optical signals with variable wavelengths, an optical signal receiving filter variable its receiving wavelength, and a control unit. An OLT selects in response to a wavelength allocation request from each ONU, a transmitting wavelength and a receiving wavelength out of currently free wavelengths and allocates these wavelengths to the requester ONT. The control unit of the ONU switches the transmitting wavelength of the optical transmitter and the receiving wavelength of the optical signal receiving filter to the wavelengths specified in a response message from the OLT and starts data communication.

Abstract: The access server receives an authentication packet including an authentication result, a port change setting information, a port change time, a filtering setting information and a filtering time from the authentication server. The access server stores the respective information in the authentication packet into a memory. The access server refers to the memory, and in the case where the port change setting information on an arbitrary user identifier is set to perform port change, when it becomes the port change time, the access server changes the output destination of a packet from a user terminal to, for example, a proxy server B from a proxy server A. Besides, in the case where the filtering setting information on an arbitrary user identifier is set to perform filtering, when it becomes the filtering start time, the access server performs filtering on the port to which the user terminal is connected.

Abstract: In a WDM type PON system, each ONU comprises an optical transmitter capable to transmit optical signals with variable wavelengths, an optical signal receiving filter variable its receiving wavelength, and a control unit. An OLT selects in response to a wavelength allocation request from each ONU, a transmitting wavelength and a receiving wavelength out of currently free wavelengths and allocates these wavelengths to the requester ONT. The control unit of the ONU switches the transmitting wavelength of the optical transmitter and the receiving wavelength of the optical signal receiving filter to the wavelengths specified in a response message from the OLT and starts data communication.

Abstract: An access network system connected to an ISP network including a subscriber authentication server comprised of a plurality of packet forwarding apparatuses each for connecting user terminals to an Internet network via the ISP network and an address pool management server having an address pool management table for holding, as a sub-address pool, a plurality of IP addresses usable over the ISP network. Each of the packet forwarding apparatuses acquires from the address pool management server an IP address to be allocated to the user terminal having requested connection to the Internet when the subscriber authentication server has succeeded in authentication of the user terminal.

Abstract: A method for processing data received from at least one of VLANs, the method including: obtaining, based on a VLAN tag included in a MAC header of a MAC frame received from the VLAN and a first destination IP address included in an IP header of the MAC frame, a second destination IP address, changing the first destination IP address of the IP header to the second destination IP address, and generating an IP packet by deleting the MAC header from the MAC frame.

Abstract: One physical VLAN server provides a plurality of VLANs with services. VLANs #1 to #3 are connected to the VLAN server though a switching hub. The VLAN server includes server processes #1 to #3 corresponding to the VLANs #1 to #3, respectively, for providing the VLANs with services. The server processes #1 to #3 each have internal IP addresses N1, N2, and N3. The VLAN server has external IP addresses G1, G2, and G3 for the VLANs #1 to #3, respectively.

Abstract: A spanning tree is formed for each of MST (Multiple Spanning Tree Protocol) instances defined by a VLAN ID and a COS value. Each terminal apparatus specifies the COS value corresponding to the TCP/UDP port number of a Ethernet frame to be transmitted, based on a conversion table indicating the correspondence of a TCP/UDP port number to a COS value and sets the specified COS value to the header of the Ethernet frame. Each of bridges in the transit network specifies the MST instance identifier of a received frame based on a conversion table indicating the correspondence of the MST instance identifier to the combination of a VLAN ID and a COS value and forwards the received frame in accordance with the spanning tree having the specified MST instance.

Abstract: In a WDM type PON system, each ONU comprises an optical transmitter capable to transmit optical signals with variable wavelengths, an optical signal receiving filter variable its receiving wavelength, and a control unit. An OLT selects in response to a wavelength allocation request from each ONU, a transmitting wavelength and a receiving wavelength out of currently free wavelengths and allocates these wavelengths to the requester ONT. The control unit of the ONU switches the transmitting wavelength of the optical transmitter and the receiving wavelength of the optical signal receiving filter to the wavelengths specified in a response message from the OLT and starts data communication.

Abstract: A packet forwarding apparatus enabling the selective provider type access service in a mobile communication network, comprising a first group of line interfaces connected to a plurality of routers deployed to service areas of a mobile network, a second group of line interfaces connected to the Internet or to routers belonging to different ISP networks, an ISP management table indicating the correspondence of domain name of each ISP networks to an authentication server address, and a controller that identifies, upon receiving from a mobile terminal a request to connect to one of said ISP networks, the domain name of the ISP network from a user ID in the connection request, transmits an authentication request including the user ID and password specified in said connection request to an authentication server associated with the ISP network, according to the authentication server address corresponding to said domain name retrieved from said ISP management table, and notifies the mobile terminal of a result of aut

Abstract: An access network system connected to an ISP network including a subscriber authentication server comprised of a plurality of packet forwarding apparatuses each for connecting user terminals to an Internet network via the ISP network and an address pool management server having an address pool management table for holding, as a sub-address pool, a plurality of IP addresses usable over the ISP network. Each of the packet forwarding apparatuses acquires from the address pool management server an IP address to be allocated to the user terminal having requested connection to the Internet when the subscriber authentication server has succeeded in authentication of the user terminal.