An example frequency converter includes a drift canceling loop with a balanced delay and a linear signal path (e.g., linear with respect to frequency scaling, amplitude modulation, and/or phase modulation). One side of the drift canceling loop includes a fixed delay, and the opposite side includes an adjustable, complementary delay. The adjustable, complementary delay facilitates precision matching of the signal delays on each side of the loop over a range of frequencies, which results in a significant improvement in noise cancelation, particularly at large offsets to the carrier, while permitting the use of a higher noise, but very fast tuning course scale oscillator. The linear signal path from the signal generator to an RF output facilitates modulation of the signal by the signal generator. A modular format is an advantageous embodiment of the invention that includes the removal of the frequency synthesizer's low phase noise reference into a separate module.

The present disclosure provides a fronthaul control device which can adjust a center wavelength of an optical signal to changeably control allocation of an optical wavelength band; an operating method of the fronthaul control device; a program for controlling allocation of an optical wavelength band; and a computer-readable recording medium in which the program is recorded.

A method includes: generating indication information, where the indication information is used to indicate a resource allocation table corresponding to a first data unit in the plurality of data units; sending the indication information in a timeslot previous to a timeslot used to send the first data unit; and sending the plurality of data units, where a resource allocation table corresponding to each data unit is selected from a plurality of resource allocation tables in a cyclic manner, and a cyclically initial resource allocation table is the resource allocation table indicated by the indication information.

The invention relates to techniques for controlling a dynamic hitless resizing in data transport networks. According to a method aspect of the invention, a network connection comprises M tributary slots defined in a payload area of a higher order transport scheme of the data transport network and the method comprises the steps of receiving a connection resize control signal at each of the nodes along the path of the network connection; adding at each node along the path in response to the connection resize control signal a second set of N tributary slots to the first set of the M tributary slots, such that the network connection comprises M+N tributary slots; and increasing, after M+N tributary slots are available for the network connection at each node along the path, a transport data rate of the network connection.

A bandwidth adjustment method and apparatus, a storage medium, and an electronic device are provided. The bandwidth adjustment method including: performing interaction of bandwidth adjustment signaling between nodes via a hitless bandwidth adjustment OAM frame, wherein the hitless bandwidth adjustment OAM frame carries indication information, the indication information is used for indicating a type of a bandwidth adjustment message transmitted in the hitless bandwidth adjustment OAM frame, and the type of the bandwidth adjustment message includes: a bandwidth adjustment request message and a bandwidth adjustment acknowledge message. By configuring the indication information carried in the hitless bandwidth adjustment OAM frame to instruct each node in the network to send at least one of a bandwidth adjustment request message and a bandwidth adjustment acknowledge message via the hitless bandwidth adjustment OAM frame.

The present disclosure provides a fronthaul control device which can adjust a center wavelength of an optical signal to changeably control allocation of an optical wavelength band; an operating method of the fronthaul control device; a program for controlling allocation of an optical wavelength band; and a computer-readable recording medium in which the program is recorded.

Embodiments of the present invention provide a data migration method and a communications node. The method includes: determining, by a first node in an OPUCn signal, a second tributary slot corresponding to a first tributary slot, where the second tributary slot is an idle tributary slot; and migrating, by the first node, a first low-order ODU service from the first tributary slot to the second tributary slot. In the embodiments of the present invention, by migrating, in an OPUCn signal, a first low-order ODU service of a first tributary slot to an idle second tributary slot, the existence of tributary slot fragments can be avoided, thereby improving utilization of network bandwidth resources.

If wavelength defragmentation is performed during the operation of an optical network, an instantaneous interruption of a network arises; consequently, data are lost; therefore, an optical network control method according to an exemplary aspect of the present invention includes monitoring a data volume of a client signal to be transmitted using a plurality of optical subcarriers; and performing synchronously, depending on a variation in the data volume, an optical subcarrier changing process of changing an active optical subcarrier, of the plurality of optical subcarriers, to be used for transmitting the client signal, and a remapping process of remapping the client signal onto an active optical subcarrier after having been changed.

Provided are a device unit, a node device, and a method and a system for automatically adjusting a tunnel bandwidth. The device unit includes: a client side element, configured to dynamically adjust The quantity of the first timeslots according to a bandwidth of a received data service before the received data service is mapped to an Optical Channel Data Unit (ODU) tunnel; a line side element, configured to configure, according to the quantity of the first timeslots adjusted by the client side element, The quantity of the second timeslots matched with the first timeslots; a tunnel managing element, configured to adjust, according to the quantity of the first timeslots and the quantity of the second timeslots, the quantity of unblocked ODU tunnels between the client side element and the line side element, wherein unblocked ODU tunnels after the adjustment carry the data service. When the bandwidth of the received data service increases or decreases, the device unit of the present disclosure flexibly controls usage of an ODU0 timeslot in an ODU of each stage, and does not need to use a complicated ODUflex frame format, thereby meeting the requirement of automatically adjusting the bandwidth without using ODUflex.

A mapping and multiplexing method for an optical transport network, an electronic device, and a storage medium are provided. The method includes: first providing a mapping opportunity generated by an OPU in a current transport window to one or more OSU services, which satisfy a first scheduling condition, in a first queue, and performing in-queue scheduling on the one or more OSU services; in a case where there is no OSU service satisfying the first scheduling condition in the first queue, providing the mapping opportunity to one or more OSU services, which satisfy a second scheduling condition, in a second queue, and performing in-queue scheduling on the one or more OSU services; updating a remaining service mapping opportunity quantity of the OSU service which gets the mapping opportunity; and dynamically allocating OSU services entering mapping and multiplexing in the current transport window to the first queue and the second queue.