Fujitsu Corporation

Miyuki Kawataka

Mikio Nakayama

Yoshihiro Watanabe

Yoshiharu Kato

Satoshi Kakuma

Shiro Uriu

Masami Murayama

Takashi Hatano

Kenichi Okabe

Yoshihiro Uchida

Jun Itoh

Yasuhiro Aso

Naoyuki Izawa

Jin Abe

Noriko Samejima

Hiroshi Nishida

Eiji Ishioka

Shigeru Sekine

Satoshi Esaka

Yoshiyuki Karakawa

Fumio Hirase

Yasuhiro Nishikawa

Shinichi Araya

Nobuyuki Tsutsui

Yoshihisa Tsuruta

Atsushi Kagawa

Atsuko Suzuki

Shouji Kohira

Hiromi Yamanaka

Yutaka Isonuma

Yasusi Kobayasi

Naoya Matsumura

Yasusi Kobayashi

Takayuki Takeda

A switch station including an ATM switch; a memory storing control data for operations of the switch station; an intra-station device, accommodating a subscriber line, performing communication operation on subscriber ATM cell; a control processor generating control information in link access protocol (LAP) format; and an interface unit converting LAP control information into ATM cell to the intra-station device through the ATM switch, wherein the control information is communicated according to LAP, the intra-station device receives the control information and transmits a direct memory access request to obtain control data stored in the memory, the interface unit obtains and converts the data format of the control data into ATM cell to transmit to the intra-station device through the switch, and the intra-station device performs the communication operation on the subscriber ATM cell based on the control data received through the switch.

Intra-station control system for connectionless communications system

In a transmission service for connecting a frame relay network to an ATM (asynchronous transfer mode) network, a congestion information setting system used in a connection apparatus capable of interfacing between the frame relay network and the ATM network, is arranged by: a congestion information extracting unit extracting congestion information from data of one network of either the frame relay network and the ATM network; a mode setting unit combining the extracted congestion information with congestion information of an output side in accordance with a setting condition; and a congestion information writing unit writing the combined congestion information into data of the other network of either the frame relay network and the ATM network in response to a mode set by the mode setting unit. Thus the congestion information can be transmitted between different networks.

Congestion information setting system

The frame synchronizing circuit establishes frame synchronization by detecting a sync pattern laid in an incoming frame. The frame synchronization circuit comprises a first frame synchronizing unit and a second frame synchronizing unit. The first and second synchronizing units synchronize with a first pattern, a second pattern at a first position and a second position, respectively. Thereafter, when the first position used for the synchronization by the first frame synchronizing unit is found to be in error, the first frame synchronizing unit synchronizes with the second pattern at the second position used by the second frame synchronization unit.

Frame synchronizing circuit

The invention provides a fixed length cell handling image communication method wherein moving picture data are compressed to data having a fixed transmission rate using a compression method for still pictures and then converted into fixed length cells so that image processing such as compression/decompression of the moving picture data can be performed at a high rate while keeping a high compression ratio and a high picture quality. A transmission apparatus for use with the method includes an image data compression section for performing still picture compression processing for moving picture data, which define information of a plurality of screens individually divided into a plurality of fields to be successively transmitted per unit time, in response to field timing information representative of a compression timing of each field to convert the moving picture data into variable length data which are independent of each other, a transmission buffer section for converting the variable length data into fixed length data having a fixed transmission rate, and a fixed length cell transmission section for placing the fixed length data and the field timing information into data parts of fixed length cells and transmitting the fixed length cells.

FIXED LENGTH CELL HANDLING TYPE IMAGE COMMUNICATION METHOD AS WELL AS TRANSMISSION APPARATUS FOR FIXED LENGTH CELL HANDLING TYPE IMAGE COMMUNICATION AND RECEPTION APPARATUS FOR FIXED LENGTH CELL HANDLING TYPE IMAGE COMMUNICATION

The quality and performance of the connectionless communications system are improved. When a BOM is received, the destination address DA of the L3-PDU stored in the payload of the BOM is retrieved, and the tag information is obtained from the DA (S,). The output message identifier MID is reserved (S,), and the tag information and output MID are assigned to the BOM (S,). Then, the tag information and output MID are written to the table. When a COM is received, the tag information and output MID are retrieved using the MID of the COM as a key, and the information is provided for the COM (S,and S,). When an EOM is received, the tag information and output MID are retrieved using the MID of the EOM as a key, and the information is provided for the EOM (S,and S,). Then, the output MID is released (S,).

Connectionless communications system, its test method, and intra-station control system

A processing apparatus for measuring accumulated values of performance monitoring (PM) parameters concerning a reception signal received by a transmission device, which is capable of detecting upper layer failures in a more accurate, hardware-based way, without increasing the workload imposed on the system's firmware. PM parameters represent the statistics of events that meet prescribed criteria for defects and anomalies in the reception signal. The processing apparatus has a plurality of failure detection units to detect different kinds of failures in the reception signal and produce failure detection signals corresponding thereto. Those failure detection units include a first failure detection unit that detects a first kind of failure and a second failure detection unit that detects a second kind of failure. On the basis of the failure detection signals, a PM controller detects at least one kind of PM parameter, and a counter unit accumulates the detected PM parameter. A control signal generator produces a stop command signal that is activated while at least the second kind of failure is present. This stop command signal is supplied to the first failure detection unit to inhibit its operation and stop the detection of the first kind of failure.

Processing apparatus for measuring performance monitoring parameters

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Kawasaki, Japan

Miyuki Kawataka