Fujitsu Corporation

Gaku Kimura

Koji Takeguchi

Takayuki Shimizu

Taro Asao

Yuzuru Ishioka

An optical hub node apparatus can be configured to include N+1 or more route units () by connecting N or less route units () selected from among the N+1 or more route units () to a route unit () including N (N:integer of 2 or more) ports to which other route units () are detachably connected. As a result, as compared with a case where N+1 route units () are completely interconnected in a meshed manner, the number of the route units () can be increased. Thus, the number (degree) of optical transmission apparatuses connectable to the optical hub node apparatus can be increased.

Degree extending method and optical hub node apparatus

A relay transmission apparatus in which the effectiveness of a protecting function is improved by suppressing variation of an OSNR value of a signal regardless of the distance that the signal is transmitted. The relay transmission apparatus is comprised of a first regenerative relay unit, a second regenerative relay unit, and a protection process unit for extracting a signal component from each of the first and second regenerative relay units and selectively outputting either of the extracted signal components as a drop signal.

Relay transmission apparatus

An object of the present invention is to propose a method of effecting a protection control for use in a communication network which makes it possible to avoid conflict between a protection switch of a SONET apparatus and a protection switch of an RPR apparatus. To this end, when ring switching of the BLSR is validated, the protection function of the RPR apparatus is invalidated while when the protection function of the RPR apparatus is validated, the ring switching of the BLSR is invalidated. The apparatus of the present invention can be applied to a network in which a ring network formed of a BLSR is connected with an RPR apparatus.

Growing community of inventors

Kawasaki, Japan

Gaku Kimura