Patent ID: 7894368

Claim:
An Optical Virtual Private Network (OVPN) system comprising: a plurality of converting sections, which are disposed so as to correspond to plural different first signal formats, for converting a first signal format and a second signal format alternately under conditions in which the first signal format which is used by a user's device which joins an OVPN and a second signal format which is used in the OVPN are different from each other; and an OVPN terminating device for communicating with the user's device, wherein the OVPN terminating device is provided with: a registering section from the user's device for a first signal format type which is used in the user's device together with an IP address of the user's device and a VPNID; a notifying section for notifying contents of the registration to other OVPN terminating device which controls the same VPNID as the user's device; a retrieving section for the first signal format type which corresponds to the IP address and the VPNID in the user's device according to a calling connection request from the user's device by referring to the information which is registered by the registering section, and a selecting section for selecting the first signal format which is used by the user's device according to a result in the retrieving section when data is transported from the user's device, wherein the registering section is provided with a section for registering a port identifier for the user's own device and a port identifier for the OVPN terminating device or an interface identifier which corresponds to at least a first signal format which is used in the user's device together with the IP address of the user's device and the VPNID.