Nippon Telegraph and Telephone Corporation

Ntt Electronics Corporation

Nippon Telegraph and Telephone Corporaiton

Osamu Ishida

Etsushi Yamazaki

Mitsuhiro Teshima

Kazuhito Takei

Kenji Kawai

Yoshiaki Kisaka

Yoshiaki Yamada

Masahito Tomizawa

Kei Kitamura

Hideki Nishizawa

Haruhiko Ichino

Kenji Hisadome

Yasuhiro Suzuki

Kengo Horikoshi

Mitsuteru Yoshida

Noboru Takachio

Kenichi Sato

Yasuharu Onuma

Kazuhiko Terada

Shoukei Kobayashi

Kazuaki Obana

Tsunemasa Hayashi

Ryosuke Kurebayashi

Takehito Yamamoto

Satoru Ota

A processing equipment includes a processing unit having a plurality of functions. A retaining unit retains a device identifier capable of identifying the processing equipment. An interface unit receives a function authentication key which is a code for setting a specific function among the plurality of functions to be enabled or disabled. A control unit sets the specific function to be enabled or disabled according to the function authentication key when a device identifier included in the received function authentication key coincides with the device identifier retained in the retaining unit.

Processing equipment and remote management system

A multilane transmission device that transmits data frames by using a plurality of lanes, comprising: a data frame allocating unit that allocates data frames based on a transmission destination; a flow group information sequence information adding unit that adds flow group information indicating a flow group corresponding to a transmission source and transmission destinations and sequence information indicating a sequence of the data frames to the data frames allocated based on each transmission destination by the data frame allocating unit; and a lane selecting/outputting unit that transmits the data frames having the respective flow group information and the respective sequence information added thereto by the flow group information sequence information adding unit to the transmission destinations by using one or more lanes corresponding to the respective flow group information.

Multi-lane transmission device and multi-lane transmission method

A parallel transfer rate converter inputs first parallel data with number of samples being S1 pieces in synchronism with a first clock, and outputs second parallel data with number of samples being S2=S1&#xd7;(m/p) pieces (p is an integer equal to or larger than 1) in synchronism with a second clock having a frequency which is p/m times of a frequency of the first clock. A convolution operation device inputs the second parallel data in synchronism with the second clock, generates third parallel data with number of samples being S3=S2&#xd7;(n/m) pieces (S3 is an integer equal to or larger than 1) by executing a convolution operation with a coefficient indicating a transmission characteristic to the second parallel data, and outputs the third parallel data in synchronism with the second clock.

Data processor, data processing method and communication device

Signal processing sections selectively switch modulation/demodulation in low-efficiency modulation system and modulation/demodulation in high-efficiency modulation system, and perform digital signal processing. Parallel-side interfaces of input/output interface sections are electrically connected to the signal processing section. A serial-side interface of the input/output interface section is electrically connected to a serial-side interface of the input/output interface section. A selection section electrically connects a parallel-side interface of the input/output interface section to the signal processing section when the low-efficiency modulation system is selected, and electrically connects the parallel-side interface of the input/output interface section to a parallel-side interface of the input/output interface section when the high-efficiency modulation system is selected.

Digital signal processing device and optical transceiver apparatus

It is an object to provide a technique capable of using a single framer as a necessary framer and causing the framer to be shared among a plurality of transmission destinations and priorities when coping with a plurality of transmission destinations or priorities and a change in a bandwidth of a physical lane that is caused by a change in a modulation scheme or a change in the number of wavelengths. A multilane transmission device that allocates client signals based on a transmission destination or a priority, decides the number of virtual lanes necessary for transmission of the client signals allocated based on each transmission destination or each priority, allocates the client signals allocated based on each transmission destination or each priority to the virtual lanes whose number has been decided, and frames the client signals allocated to the virtual lanes as transport frames, multiplexes the virtual lanes into a physical lane, and transmits the framed transport frames by using the physical lane.

The present invention provides a signal block sequence processing method. According to the method, signal block headers (Bch, Bdh) are deleted from each sequence of signal blocks (B) each composed of the signal block header indicating whether a signal block payload is a control block payload (Bc') containing a control code is contained or a data block payload (Bd&#x2032;) containing data is contained. The resultant signal blocks are formed into one group (G). Each control block payload in the group is provided with position determination information indicating the position of the control block payload in the group. The signal block payloads are rearranged in accordance with a signal block payload rearrangement rule. The rearranged signal block payloads are contained in a super-block payload (Sc), to which a super-block header (Shc) indicative of containment of control block payloads is added. The resultant super-block (S) is output.

Signal block sequence processing method and signal block sequence processing apparatus

The number of response-waiting requests which are already sent to a server () but to which a response is not yet returned from the server () is limited. To limit this number, received requests are temporarily accumulated in a buffer if the number of response-waiting requests has reached a threshold and, until the number of response-waiting requests falls below the threshold, requests are not sent from the buffer. The execution status of the server () is monitored, and the threshold is increased when the response time from the server () to a request is within an allowable range, and the threshold is decreased when the response time exceeds the allowable range. In addition, TCP connections between a load control device () and clients (--) are aggregated so that the number of simultaneous connections of TCP connections between the server () and the load control device () becomes equal to or smaller than the threshold of the number of response-waiting requests.

Load control device and method thereof for controlling requests sent to a server

A method and apparatus for synchronous frame communication first communicates a frame signal having communication data and first control information having a bit length and an SDH frame structure in a part of frame time interval and a control information processing method based on an SDH-frame-overhead-process for processing the first control information that includes bytes indicative of each of a relay node's section overhead, an end terminal section overhead, and at least a part of a byte of higher path's overhead. In the frame time interval a signal is communicated by a different second communicating method having the communication data and second control information having a bit length capable of including a significantly higher amount of information than that of the first control information and which corresponds to the first control information byte communicated in the frame time interval.

Method and apparatus for synchronous frame communication

In a transmission node, a portion of the control information is separated into M (M is an integer) parts of control information blocks having N (N is an integer) bit length. A control information parity having (8&#x2212;N) bit length is added to control information block i. The control information block is encoded to M parts of control information having 8 bit length according to a predetermined control information bit array. The control information parity and the control information bit array are set such that Hamming distance of each of the control information code is d, and Hamming distance of the control information 10B code is D (d and D are integers). In a receiving node, the control information code is separated into the control information block and the control information parity. Parity check is performed. When an error is detected, error processing is performed.

Encoding method and apparatus for forward error correction

An optical cross-connect system which can be constructed using the same kind of optical switches having a small extinction ratio and a small number of optical switch driving circuits is provided. The optical signal selector in the system comprises a first optical switching device for permitting only the wavelength-division multiplexed light beam passing through one of plural optical paths to pass, a wavelength router for demultiplexing the permitted multiplexed light beam into optical signals of different wavelengths and respectively outputting these demultiplexed signals into different output ports, this router having a routing characteristic such that the output port to which each demultiplexed signal is output is different for each input port, a second optical switching device for permitting only one of the optical signals output from plural optical paths connected to the output ports of the wavelength router to pass, and an optical combiner for combining the optical paths of the second optical switching device.

Optical cross-connect system

The tunable optical filter comprises a pair of optical switches and an arrayed-waveguide grating router that has sixteen input waveguides and sixteen output waveguides. The frequency-division-multiplexed optical signal is directed through the first 1.times.4 optical switch to a selected input waveguide of the router so as to be demultiplexed into output waveguides of the router. The second 1.times.4 optical switch selects one of four output waveguides of the router so as to obtain a selected optical frequency. By appropriately connecting the switches with the input and output waveguides of the router, sixteen combinations of switch states correspond respectively to sixteen frequencies to be passed by the tunable optical filter. As a result, the filter can be tuned digitally to one of sixteen frequencies with small-size (1.times.4) optical switches. It is also possible to reduce the loss in the tunable optical filter because the optical signal is only required to make a single passage through the arrayed-waveguide grating router.

Growing community of inventors

Kanagawa, Japan

Osamu Ishida