Kddi Corporation

Noboru Yoshikane

Takehiro Tsuritani

Hidenori Takahashi

Tomohiro Otani

Shohei Beppu

Daiki Soma

A communication device includes: a switching unit connected to a transmission unit, a reception unit, a transmission port, and a reception port, the switching unit being set in a first state in which the transmission unit and the transmission port are connected and the reception unit and the reception port are connected or a second state in which the transmission unit and the reception port are connected and the reception unit and the transmission port are connected; a monitoring unit configured to monitor a light level of light input from the reception port or the transmission port; and a control unit configured to set the switching unit in the first state or the second state based on the light level monitored by the monitoring unit.

Communication device and communication system

A link connectivity verification message to recognize a physical link connection state is transmitted from the WDM to the PXC on a C-plane. The PXC transmits a link connectivity verification ACK message including information representing a physical link connection state, and the WDM transmits a cross-connect instruction message to cross-connect a transmission side and a reception side of a port (port) of the PXC. Probe light transmitted from the port (port a) of the WDM is turned back by a cross-connect of the port (port) of the PXC. The WDM receives the probe light to verify a link connectivity.

Growing community of inventors

Saitama, Japan

Noboru Yoshikane