Patent application number | Description | Published |
20090129262 | Transmission device - A transmission device includes a synchronous transmission network interface section, a switch section, first and second LAN interface sections, a distribution section, and a transmission and reception section, and said second LAN interface section includes a de-mapping section, a transmission and reception section, a collection section, and a mapping section. | 05-21-2009 |
20090290488 | TRANSMISSION SYSTEM, PATH CONTROL METHOD AND TRANSMISSION DEVICE - The present invention is a transmission system, a path control method, and a transmission device, and is the path control method in the transmission system forming a virtual concatenation group by virtually concatenating each path signal transmitted through a plurality of paths being a logical communication path, which manages an active state and a stand-by state of member paths of the virtual concatenation group and when there is abnormality in any of the member paths in the active state, controls any of the member paths in the stand-by state to the active state in place of the abnormal member path, thereby realizing more flexible and efficient path level redundancy. | 11-26-2009 |
20110229133 | TRANSMISSION APPARATUS AND SIGNAL TRANSMISSION METHOD - A transmission apparatus stores frame data of a first frame in a second frame having a bit rate different from that of the first frame through regulation of the amount of stuffs to be stored in the second frame. The transmission apparatus includes: a storage unit storing the first-frame frame data; a first control unit controlling a timing of writing the first-frame frame data in the storage unit based on first stuff information indicating the amount of stuffs contained in the first frame; an arithmetic and logic unit obtaining second stuff information indicating the amount of stuffs to be contained in the second frame based on a bit rate ratio between the first frame and the second frame; and a second control unit controlling a timing of reading out the first-frame frame data stored in the storage unit based on the second stuff information. | 09-22-2011 |
20120014270 | Frame signal generating method and frame signal generating device - A method for generating a frame signal includes monitoring a first frame signal and obtaining a first parameter based on the monitoring result; setting a second parameter based on the type of the first frame signal; when the first frame signal is being input, generating a second frame signal with a bit rate different from that of the first frame signal by determining data and stuff byte positions based on the first parameter and performing frame processing on data and stuff bytes corresponding to the first frame signal based on the determined data and stuff byte positions; and when the first frame signal is not being input, generating the second frame signal by determining the data and stuff byte positions based on the second parameter and performing the frame processing on data and stuff bytes corresponding to a maintenance signal based on the determined data and stuff byte positions. | 01-19-2012 |
20120134367 | SIGNAL DISTRIBUTION CIRCUIT AND STUFFING CONTROL UNIT - A signal distribution circuit includes: first to n-th input lines on which first to n-th signals are respectively input; first to (n−1)th selectors each of which selects one of two inputs under the control of a select signal; and a first output line on which the first signal is output and second to n-th output lines on which output signals of the first to (n−1)th selectors are respectively output, wherein: the first and second inputs of the first selector are supplied with the first signal and the second signal, respectively, the first and second inputs of the i-th selector (i is an integer between 2 and (n−1)) are supplied with the output signal of the (i−1)th selector and the (i+1)th signal, respectively, and any of the selectors, when selected by the select signal, selects the second input and, when not selected by the select signal, selects the first input. | 05-31-2012 |
20120251127 | FRAME MAPPING APPARATUS AND FRAME MAPPING METHOD - An apparatus for mapping multiple lower-speed signal transmission frames to a higher-speed signal transmission frame. The apparatus includes buffers configured to buffer the lower-speed signal transmission frames, determination units configured to determine frequency justification information for the lower-speed signal transmission frames, a barrel shifter configured to receive signals output from the buffers, and a controller configured to control the barrel shifter to map the lower-speed signal transmission frames to the higher-speed signal transmission frame based on external settings for the respective lower-speed signal transmission frames and the frequency justification information determined by the determination units. When the minimum unit of the lower-speed signal transmission frames is a channel, the number of the buffers and the number of the determination units correspond to the maximum number of channels that can be multiplexed in the higher-speed signal transmission frame. | 10-04-2012 |
20120281985 | TRANSMITTING APPARATUS AND SIGNAL TRANSMITTING METHOD - A transmitting apparatus includes a frame dividing circuit that maps frame data of each of a plurality of frames whose period is different from each other into one or a plurality of internal frames having a fixed frame period and a fixed transmission rate, based on a predetermined internal clock; a cross-connect circuit that cross-connects the frame data of each in a time division multiplexing system based on the internal clock in units of the internal frames; and a frame combining circuit that demaps, into any of the plurality of frames, or multiplexes, data of one or a plurality of internal frames cross-connected by the cross-connect circuit. | 11-08-2012 |
20120302185 | TRANSMISSION APPARATUS AND FREQUENCY FLUCTUATION COMPENSATION METHOD - In a transmission apparatus, a comparison unit provides threshold values associated with an amount of data indicating a signal frequency, and compares an input parameter obtained by cumulatively adding a correction amount to the parameter with the threshold values. When the input parameter is within a range defined by the threshold values, a correction unit outputs a value of the input parameter. When the input parameter is out of the defined range, the correction unit outputs an associated one of the threshold values so as to eliminate an amount exceeding or falling short of the defined range, to thereby correct the input parameter. An addition unit detects the correction amount which is an amount of the immediately preceding value of the input parameter exceeding or falling short of the defined range, and cumulatively adds the correction amount to the input parameter used for the comparison of this time. | 11-29-2012 |
20130004168 | CLIENT SIGNAL ACCOMMODATING MULTIPLEXING APPARATUS AND METHOD - In an apparatus for accommodating and multiplexing asynchronous client signals in which an idle signal is defined, the transmission side transmits client signals after synchronizing the client signals by inserting or removing, with reference to a specific client signal, an idle signal to/from the same type of another client signal, and in the receiving side, a PLL part is shared by recovering a clock from a client signal and distributing the clock for another client signal. | 01-03-2013 |
20130058643 | DATA AMOUNT DERIVATION APPARATUS - A data amount derivation apparatus includes: a first calculator configured to derive, for one series of parallelized mapping signals, amount of data in each frame period for a frame into which the parallelized mapping signals are mapped; and a second calculator configured to sum up amounts of data in N frame periods, where N is an integer, and to derive the resulting summation value as the amount of data to be mapped into the frame, each of the amounts of data in each of the frame periods being derived by the first calculator. | 03-07-2013 |
20130058655 | TRANSMISSION APPARATUS FOR OPTICAL TRANSPORT NETWORK, AND STAFF CONTROL METHOD THEREFOR - A transmission apparatus for an optical transport network includes maps client data to a payload of an optical transport unit in order to obtain a higher layer frame generated based on a clock on the optical transport network side, and sends the higher layer frame to the optical transport network. A Cn value indicating an amount of the client data to be mapped to the payload of the optical transport unit is computed based on a counted value, counted using a clock of the client data, of a time period corresponding to the payload of the optical transport unit in the higher layer frame generated using a clock of the optical transport network. | 03-07-2013 |