Abstract: To provide a node (an optical transmission apparatus) enabling expanding the upper limit of the number of nodes capable of automatically forming a squelch table generated in advance in a BLSR system. For the above purpose, when generating a squelch table, hop counts counted from an add node or a drop node are used in place of a node ID of the own, as information of the add node, the drop node, etc. to be transmitted and received using a squelch data link. Thus, it becomes unnecessary to transmit and receive two information sets, a source node ID and a destination node ID, as conventionally required. By this, the number of bits available for identifying nodes can be expanded, enabling expansion of the number of nodes for which a squelch table can be formed automatically.

Abstract: An optical bi-directional line-switched ring transmission system includes a unit configured to transmit, from a transmission source node in a signal path for setting a cross-connect to an adjacent node, squelch information storing identity information of a transmission source node and a transmission destination node in a squelch information region provided in an optical overhead, in an own node that has received the squelch information, a unit configured to allocate cross-connect setting information based on the transmission source and transmission destination identity information, judge whether an own node is a transmission destination node or a through node of the cross-connect, execute through cross-connect setting in the own node; and—a notifying unit configured to, when the own node has been judged to be the transmission destination node of the cross-connect, notify a user with a message indicating that a cross-connect setting request exists.

Abstract: In a ring network system, a first node device includes means for sending out a control signal for controlling one of a plurality of second node devices so as to allow signals transmitted over a protection band to pass through the second node device; each of the second node devices includes means for receiving the control signal sent out from the first node device or another second node device, means for controlling the signals transmitted over the protection band to pass through the second node device during the reception of the control signal, and means for transferring the control signal to the adjacent first node device or to the adjacent second node device during the reception of the control signal; and the first node device further includes means for receiving the control signal transferred from the adjacent second node device.

Abstract: To provide a node (an optical transmission apparatus) enabling expanding the upper limit of the number of nodes capable of automatically forming a squelch table generated in advance in a BLSR system. For the above purpose, when generating a squelch table, hop counts counted from an add node or a drop node are used in place of a node ID of the own, as information of the add node, the drop node, etc. to be transmitted and received using a squelch data link. Thus, it becomes unnecessary to transmit and receive two information sets, a source node ID and a destination node ID, as conventionally required. By this, the number of bits available for identifying nodes can be expanded, enabling expansion of the number of nodes for which a squelch table can be formed automatically.

Abstract: In a signal transmission method and device which perform squelch processing in order to support a BLSR switchover when a single fault has occurred and when a plurality of faults have occurred over a ring network, NUT information set in a squelch information overhead for a predetermined channel within a channel group over a ring network is extracted; and a NUT table for the predetermined channel is created based on the extracted NUT information. Furthermore, the NUT information is inputted from an outside to be set in the squelch information overhead, and one transmission device transmits a frame including the squelch information overhead to the ring network, and the other transmission device receives the frame from the ring network to be transferred.

Abstract: The number of nodes that can be identified is increased without redefining switching request and switching status fields in existing K1/K2 bytes. Eight bits are assigned to a node ID field, and source node ID is stored in the node ID field when transmitting over a short path, while a destination node ID is stored in the node ID field when it transmitting over a long path.

Abstract: The present invention relates to a node device applied to BLSR, a communication system containing the node device and a redundancy configuration method for the node device. An object of the invention is to keep simplicity of 2F-BLSR, and implement span switching at the same level as that of 4F-BLSR. Therefore, the invention is equipped with a controller which substitutes when a failure occurs in a preceding transmission section of any one of the plural annular transmission lines but not in the rest of them, any reserve band of the rest of the annular transmission lines for the active band of the preceding transmission section with the failure therein.

Abstract: The number of nodes that can be identified is increased without redefining switching request and switching status fields in existing K1/K2 bytes. Eight bits are assigned to a node ID field, and source node ID is stored in the node ID field when transmitting over a short path, while a destination node ID is stored in the node ID field when it transmitting over a long path.