| 摘要 |
An optical access network which can attain protection control without affecting an E-PON which provides the Ethernet service. In the optical access network constituting the E-PON in which a transmission line is duplicated between an OLT and ONTs, the OLT has an L2 control part mounting a protocol provided with protection control information at the high order of the Ethernet MAC as a protocol constitution. The OLT has the protection control information independently from the Ethernet MAC as the protocol constitution, and transfers user data and the protection control information. |
