50 results about "Optical data unit" patented technology

A method of processing a digital signal for transmission is provided comprising digital data frames, by compressing the digital data frames; and generating an optical data unit for transmission comprising multiple of the compressed digital data frames. The optical data unit is configured for transport by an Optical Transport Network, OTN.

The invention discloses a device for cross protection, comprising a business unit source end, a combined cross unit and a business unit sink end, wherein, the business unit source end is used for mapping an optical data unit (ODUk) signal to the same time slot in n paths of optical transport network (OTN) frame structure (OTUxG) data buses; m+n paths of OTUxG data are obtained by protection coding to be transmitted to the combined cross unit; the combined cross unit is used for cutting the time slot of the m+n paths of OTUxG data, and sends to the business unit sink end after multiple connection; the business unit sink end is used for protection coding of m+n paths of OTUxG data to recover n paths of OTUxG data and extract a corresponding ODUk signal from the same time slot of n paths of OTUxG data. The invention also discloses a method for cross protection. The invention realizes ODUk (k=0, 1, 2 and 3) level cross dispatching, improves processing efficiency, saves resource and is convenient and flexible for operation.

The invention discloses a method and a device for fault handing of an optical channel bandwidth and belongs to the field of photo-communication. The method for fault handing of the optical channel bandwidth comprises that whether high order time slot adjustment is completed in a link which is out of order in an optical channel data optical data unit (ODU) flex path is judged, when a condition that the high order time slot adjustment is completed in the link is taken as a judge result, in the ODU flex path, all the bandwidths of the links are triggered to be adjusted to a state after all the links are adjusted on condition that the links are not out of order, and the flex means a random bit rate. Adaptive handing ability for faults by the ODU flex lossless adjustment is expanded, the phenomenon that bandwidths of all the sections are disaccorded with states before the adjustment or after the adjustment in the ODU flex path when a fault is caused is eliminated, the effect that when the fault is caused, the ODU flex path can still normally be adjusted to finish or recover the state before the adjustment is ensured, and the adapting ability is strong.

The invention discloses a shared protection control method of an optical data unit (ODU) loop, which comprises the following steps: arranging two virtual channel loops in the ODU loop, wherein one virtual channel loop is used for bearing service transmission, and the other virtual channel loop is used as a virtual protection channel loop; and when an alarm or a fault is detected in the virtual channel loop for bearing services, carrying out virtual channel loop protection control according to the detection result. The invention simultaneously discloses a shared protection control device of the ODU loop, which comprises a setting unit, a detecting unit and a protection control unit, wherein the setting unit is used for setting two virtual channel loops in the ODU loop, one virtual channel loop is used for bearing the service transmission, and the other virtual channel loop is used as the virtual protection channel loop; the detecting unit is used for detecting whether the alarm or fault occurs in the virtual channel loop for bearing the services; and the protection control unit is used for carrying out virtual channel loop protection control according to the detection result. In the invention, the protection granularity of the ODU shared loop is refined and the protection modes are enriched.

The invention discloses a passive optical network and an optical network unit optical module of the passive optical network. An optical network comprises an optical line terminal and an optical network unit, wherein the optical module of the optical line terminal is used for sending an optical signal of the first wavelength to serve the optical signal as a downlink optical signal, receiving an optical signal of the second wavelength to serve as an uplink optical signal, sending an optical signal of the third wavelength, wherein the optical signal of the third wavelength is used for detecting breakpoints and confirming the position of the breakpoints of an optical fiber. The optical module of the optical network unit is used for receiving the optical signal of the first wavelength, sending the optical signal of the second wavelength and reflecting the optical signal of the third wavelength. Due to the fact that the optical line terminator (OLT) can send and receive the optical signal of the third wavelength used for detecting the breakpoints when sending the uplink optical signal and the downlink optical signal are not influenced, the optical module of the optical net unit (ONU) can reflect the optical signal used for detecting the breakpoints to enable the detection of the breakpoints of the optical fiber to be convenient and not to influence the regular transmission of signals of the other optical networks without breakpoint position.

A method and system for automatically discovering a flexible rate Optical Data Unit (ODUflex) bandwidth hitless resizing capability are provided in the present document. The method includes: a source end interface of a link sending link summary message to an opposite end interface of the link, wherein the link summary message carries information of whether the source end interface of the link supports the ODUflex bandwidth hitless resizing capability; after receiving the link summary message, the opposite end interface of the link feeding back message to the source end interface of the link according to said information or according to said information and whether the opposite end interface of the link supports the ODUflex bandwidth hitless resizing capability, the source end interface of the link determining whether the link supports the ODUflex bandwidth hitless resizing capability according to the message fed back by the opposite end interface of the link.

The embodiment of the invention provides an optical signal transmission method and a related device. An optical signal transmission method may include mapping a first optical data unit frame to a first flexible branch unit frame, the first flexible branch unit frame including a plurality of payload blocks; mapping the first flexible branch unit frame to a first optical payload unit frame, wherein a plurality of payload blocks included in the first flexible branch unit frame are distributed in a payload area of the first optical payload unit frame; mapping the first optical payload unit frame to a second optical data unit frame, the bit rate of the second optical data unit frame being greater than the bit rate of the first optical data unit frame; mapping the second optical data unit frame to a first optical transport unit frame; and transmitting the first optical transmission unit frame. According to the technical scheme of the embodiment of the invention, the bandwidth utilization rate and the adjustment flexibility of the transmission rate of the customer service are improved.

The invention discloses a mapping method of an optical channel data unit ODUk, which comprises the following steps: inputting TFI-5 data of a time-division multiplexing structure interface, and positioning the boundary position of rate adjustment bytes which need to be deleted; deleting the rate adjustment bytes in the TFI-5 data according to the positioned boundary position; and converting the clock signal frequency of data which does not contain the rate adjustment bytes onto a clock domain located by ODUk data and converting the width of the data to the width of the ODUk data. Correspondingly, the invention further discloses an ODUk mapping device which comprises a data input unit, a frame positioning unit, a first-in first-out (FIFO) unit and a data assembly unit. Therefore, the mapping method and the device can realize the mapping of the TFI-5 data to the ODUk data and further lead the ODUk data on different single boards to be exchanged.

An optical modulation unit included in an optical transmitter includes two optical modulators that modulate each of two light beams based on applied bias voltages and input modulation signals, and an optical phase regulator that is connected to either of the two optical modulators, and regulates a phase of the light beam incident on the optical modulator. In a state where no modulation signal is input to the two optical modulators, while keeping bias voltages to be applied to one optical modulator and the optical phase regulator constant, the controller determines a first initial bias voltage such that an output light beam from the other optical modulator becomes zero. Thereafter, the controller determines a second initial bias voltage such that an output light beam from the one optical modulator becomes zero, while applying the first initial bias voltage to the other optical modulator.

The invention provides a serial method of a wireless link control layer service data unit, which includes steps as follows: A media access control layer calculates the size of a transmission block according to a predetermined scheduling algorithm and notifies the wireless link control layer. The wireless link control layer judges that whether the sum of the length of the wireless link path control layer service data unit, the overhead of the wireless link control layer and the overhead of the media access control layer is larger than the size of the transmission block. Whether to implement serial treatment is ensured according to the judged result. And according to the protocol data unit which is provided by the wireless link control layer, the media access control layer judges that whether the sum of the length of the service data unit of the media access control layer and the overhead of the media access control layer is smaller than the size of the transmission block. The transmission block is produced according to the judged result.

A method of processing a digital signal for transmission is provided comprising digital data frames, by compressing the digital data frames; and generating an optical data unit for transmission comprising multiple of the compressed digital data frames. The optical data unit is configured for transport by an Optical Transport Network, OTN.

An invention provides a method for efficient utilization of a transport capacity provided by an Optical Transport Network, OTN, the method comprising the steps of: (a) mapping (S1) client signals comprising Lower Order, LO, Optical Data Units, LO ODUk, into Optical Data Tributary Units, ODTU, each requiring a number of Tributary Slots, TS, of an aggregate OPU_N payload area having a size corresponding to the available aggregated OPU payload areas of Nx independent Higher Order, HO, Optical Data Units, HO ODUk, to be transported; (b) multiplexing (S2) the Optical Data Tributary Units, ODTU, into the aggregate OPU_N payload area; (c) mapping (S3) the Tributary Slots, TS, of the aggregate OPU_N payload area into Tributary Slots, TS, provided by the OPU payload areas of the Nx independent Higher Order, HO, Optical Data Units, HO ODUk, according to a predefined mapping rule, MR; and (d) further multiplexing the Nx independent Optical Data Units, ODUk, containing the OPU payload areas or transmitting them as Optical Transport Units, OTUk

A method for efficient utilization of a transport capacity provided by an optical transport network includes mapping client signals comprising lower order optical data units into optical data tributary units, each requiring a number of tributary slots of an aggregate payload area having a size corresponding to the available aggregated OPU payload areas of Nx independent higher order optical data units to be transported. The method further includes multiplexing the optical data tributary units into the aggregate payload area. The method further includes mapping the tributary slots of the aggregate payload area into tributary slots provided by the OPU payload areas of the Nx independent higher order Optical data units according to a predefined mapping rule. The method further includes multiplexing the Nx independent optical data units containing the payload areas or transmitting them as optical transport units.

An exemplary method and apparatus are provided for transmitting an asynchronous transport signal over an optical fiber section of an Optical Transport Network. Higher order Optical Data Units of an asynchronous transport signal to be transmitted may be encapsulated into outer transport frames that offer a payload rate higher than a nominal bit rate of the asynchronous transport signal. An output optical signal, which contains the outer transport frames with the encapsulated asynchronous transport signal, is generated at a locally generated clock rate and transmitted over an optical fiber section. To encapsulate the asynchronous transport signal, its bit rate is adapted to the payload rate of the outer transport frames, which is derived from the locally generated clock through a justification and stuffing process. The rate adapted transport signal is then synchronously mapped into the outer transport frames at the rate of the locally generated clock.

The present invention discloses a transmission rate adjustment method in an optical transport network and a network device. The method includes that the network device receives a transmission rate adjustment instruction, wherein the transmission rate adjustment instruction is an instruction for adjusting the target time slot information of a high-order optical data unit occupied by a target optical data unit, and the target optical data unit is a rate-configurable optical data unit; the network device determines the target time slot occupation information according to the transmission rate adjustment instruction, and adjusts the transmission rate of an optical channel corresponding to the target optical data unit according to the target time slot occupation information; the network devicetransmits the rate adjustment information of the optical channel corresponding to the target optical data unit to a downstream device connected to the network device, wherein the rate adjustment information includes a rate adjustment instructor and the target time slot occupation information, and the rate adjustment instructor is configured to instruct the downstream device to adjust the transmission rate of the optical channel corresponding to the target optical data unit according to the target time slot occupation information, thereby adjusting the transmission rate of the entire optical channel in the optical transmission network.

Partial survivability systems and methods implemented in a node in an Optical Transport Unit Cn (OTUCn) network include, subsequent to an optical carrier (Optical Tributary Signal (OTSi)) failure of a plurality of optical carriers, determining which Optical Data Unit k (ODUk) services in an OTUCn associated with the OTSi are affected; signaling a partial failure for the OTUCn and a failure only for the affected ODUk services; adjusting overhead associated with the OTUCn based on the OTSi failure; and applying actions to the affected ODUk services subsequent to the OTSi failure. The signaling of the partial failure can include signaling one or more of a partial Alarm Indication Signal (P-AIS), a partial Backward Defect Indication (P-BDI), and a partial Server Signal Fail (P-SSF) for the OTUCn, and the signaling the failure can include signaling one or more of AIS, BDI, and SSF only for the affected ODUk services.

A network element includes a client port configured to receive a signal for transmission; a line port configured to transmit the signal to a far end via Optical Transport Network (OTN); circuitry configured to communicate one or more of a fault and a status associated with the signal to the far end via OTN overhead. The circuitry configured to communicate can be for the fault and utilizes one or more Tandem Connection Monitoring (TCM) layers in the OTN overhead. The circuitry configured to communicate can be for the status and utilizes one or more of Optical Data Unit (ODU) Performance Monitoring (PM) and one or more Tandem Connection Monitoring (TCM) layers.

The embodiment of the invention discloses a lossless adjustment method of the ODUflex channel bandwidth and an ODUflex channel and relates to the technical field of communication. The lossless adjustment method comprises the steps that according to bandwidth adjustment indication requesting information, a time slot, occupied by an ODUflex frame on the outlet side of each network node on the ODUflex channel, of a high-order optical channel data unit is adjusted; according to speed adjustment instruction information, the speed of ODUflex frame transmission conducted by each network node is adjusted, and the transmission speeds of the network nodes on the ODUflex channel are made to be unified. According to the lossless adjustment method, the time slot that the ODUflex frame on the outlet side of each network node on the ODUflex channel occupies the high-order optical data unit is adjusted, the speed of ODUflex frame transmission conducted by each network node on the ODUflex channel is adjusted, and therefore lossless adjustment of the ODUflex channel bandwidth is achieved.