Access network system, subscriber station device, and network terminal device

A subscriber station device included in an access network system where a subscriber terminal makes access to a given network, wherein:

• a first network connected to said given network side and for performing transfer of a layer 2 level is connected to a second network connected to said subscriber terminal side and for performing transfer of said layer 2 level, and terminating each of said first and said second networks, said subscriber station device further comprises:
• means for transmission of a frame using a VLAN pass identified by a VLAN tag in said second network;
• and
• means for adding a frame header including said VLAN tag used in said second network to a frame to be sent to said first network.

A network terminal device included in an access network system where a subscriber terminal makes access to a given network and being able to put said subscriber terminal under control, wherein said network terminal device comprises:

• means for transmitting information to identify said given network to a subscriber station device where said subscriber terminal passes through when connecting to a given network in case a connection setup information to a given network is received from said subscriber terminal;
• means for receiving a VLAN tag corresponding to connection to a given network by said subscriber terminal as a response to information to identify said given network from said subscriber station device;
• storage means for storing by matching said VLAN tag with MAC address of said subscriber terminal;
• means for adding said VLAN tag being matched with MAC address of said subscriber terminal in said arbitrary frame and stored when an arbitrary frame to be sent from said subscriber terminal to a given network is received;
• and
• means for sending the frame added with said VLAN tag to said subscriber terminal.