A signal transmission method includes receiving, by a controller, a request signal sent by a first transmitter. The method includes establishing, by the controller according to the request signal, a second optical path that connects the first transmitter to the second receiver in the optical switching network (OSN). The method includes sending, by the controller, to the second receiver according to the request signal, a reset signal used to instruct the second receiver to be reset to an initial state. The method includes sending, by the controller, an acknowledgement signal to the first transmitter. The acknowledgment signal is used to instruct the first transmitter to send, by using the second optical path, an optical signal to the second receiver.

An improved autonegotiation approach includes determining that a negotiated rate between a first network device and a second network device exceeds data transfer capacity over a network path downstream of the second network device. In response, a configuration message is generated and transmitted to the first network device. When received by the first network device, the configuration message causes the first network device to limit data transfer between the first network device and the second network device to no more than the downstream data transfer capacity.

This application disclose a slot negotiation method for a fine-grain service in a FlexE. A sending apparatus may send the N requests to a receiving apparatus. The N requests initiates full slots negotiation of the fine-grain service. The N requests carry full sub-slot information of a sub-slot occupied by the fine-grain service, and the full sub-slot information indicates all sub-slots occupied by the fine-grain service. The receiving apparatus and the sending apparatus may perform negotiation based on the N requests and full slots of the fine-grain service. Therefore, fine-grain slots of the sending apparatus and the receiving apparatus are consistent, and a problem of inconsistent fine-grain slots of the sending apparatus and the receiving apparatus that may exist due to use of an incremental negotiation manner is avoided.

A signal transmission method includes receiving, by a controller, a request signal sent by a first transmitter. The method includes establishing, by the controller according to the request signal, a second optical path that connects the first transmitter to the second receiver in the optical switching network (OSN). The method includes sending, by the controller, to the second receiver according to the request signal, a reset signal used to instruct the second receiver to be reset to an initial state. The method includes sending, by the controller, an acknowledgement signal to the first transmitter, by using the second optical path, an optical signal to the second receiver.

An optical communication device includes: a control signal generation unit that generates, on the basis of a communication log, a sleep cancellation signal including information about at least one time at which communication with a terminal device performing wireless communication with a power-receiving optical communication device is expected to be successful, the communication log including information about a result of communication at a time when sleep state cancellation is performed on the power-receiving optical communication device that is driven by electrical power obtained from an optical signal for power supply; and an optical communication unit that converts the generated sleep cancellation signal into an optical signal, and transmits the optical signal to the power-receiving optical communication device.

The embodiments of the present invention relate to the field of communications technologies, and disclose a lossless adjustment method of ODUflex channel bandwidth and an ODUflex channel. The lossless adjustment method includes: respectively adjusting, according to bandwidth adjustment indication request information, a time slot occupied by an ODUflex frame in a higher order optical channel data unit at an egress side of each network node on an ODUflex channel; and adjusting, according to rate adjustment indication information, a transmission rate of the ODUflex frame of each network node on the ODUflex channel, to enable the transmission rate of each network node on the ODUflex channel to be unified.

A data center network includes a plurality of packet-optical switches each at a location in the data center network and each including a switch fabric comprising both a Layer 1 fabric and a packet fabric communicatively coupled to one or more line ports; wherein the plurality of packet-optical switches are communicatively coupled to one another in a topology to form data connectivity in the data center network, and wherein each of the plurality of packet-optical switches is configured to provide the data connectivity through the Layer 1 switch bypassing the packet fabric when the location does not require Layer 2 forwarding in the topology, and provide the data connectivity through the Layer 1 switch and using the packet fabric to provide the data service with multi-point connectivity when the location requires Layer 2 forwarding in the topology.

The embodiments of the present disclosure relate to the field of communications technologies, and disclose a lossless adjustment method of ODUflex channel bandwidth and ODUflex channel. The lossless adjustment method includes: respectively adjusting, according to bandwidth adjustment indication request information, a time slot occupied by an ODUflex frame in a higher order optical channel data unit at an egress side of each network node on an ODUflex channel; and adjusting, according to rate adjustment indication information, a transmission rate of the ODUflex frame of each network node on the ODUflex channel, to enable the transmission rate of each network node on the ODUflex channel to be unified.

A method and related network node are provided which allow a hitless resizing of protected ODUflex connections in an Optical Transport Network. In order to synchronize resizing of active and protection paths (54, 55), a logical processing (60, 61) of resize overhead signals that are related to end to end signaling (RP) and/or connectivity check (TSCC) is introduced into a sink side connection function (58), which terminates a protection group.

Embodiments of the present invention relate a method, an apparatus, and a system for assigning a tributary port number. The method includes: receiving a service path request message including a service type for establishing a service path used to bear a Lower Order ODU service; determining an OTU link; determining a free tributary slot resource in the OTU link; if a MSI bytes in the OTU link indicates a service type, assigning a tributary port number other than tributary port numbers used by Lower Order ODU services having the same type as the Lower Order ODU service in the OTU link; or if the MSI bytes in the OTU link does not indicate a service type, assigning a tributary port number other than tributary port numbers used by all types of Lower Order ODU services in the OTU link; and sending a service path acknowledgment message to the neighboring node.