Fujitsu Corporation

Matsushita Electric Industrial Co., Ltd.

Hiroo Uchiyama

Akikazu Maehara

Mitsuharu Wakayoshi

Keiji Shintani

Yoshikazu Nozaki

Etsuko Yamashita

Akira Ohama

Naoyuki Yoshizumi

A transmission system can perform flow control even if a flow control instruction is invalidated, and even when the transmission system malfunctions, it can autonomously recover to normal operation for communications. A flow control instruction sender has at least one of two functions including a normal transmission mode to send a flow control instruction for flow control over a congestion state if an event, such as the occurrence of a congestion or the removal of a congestion, occurs when a data receiver receives data, and an autonomous transmission mode to select one of a plurality of congestion states at present in each period and autonomously send a flow control instruction corresponding to the selected congestion state. The flow control instruction sender preferentially sends a flow control instruction in the normal transmission mode in which a congestion actually occurs or is actually removed, when timings of the normal transmission mode and the autonomous transmission mode coincide with each other. A flow control instruction receiver receives a flow control instruction to perform flow control by stopping sending data and sending data.

Transmission system with congestion state-based flow control

An address fault monitoring device and an ATM switching device capable of efficiently monitoring faults and quickly performing counter-fault process. Data storing unit stores data transmitted thereto. Write control unit controls the writing of data with respect to the data storing unit and notifies a read control side of write address information WD including information on a write address. Read control unit controls the reading of data with respect to the data storing unit and notifies the write control unit of read address information RD including information on a read address. Floating address measuring unit counts the number of floating addresses, and when a transmission error has occurred during transmission of the write address information WD or the read address information RD, it reckons the corresponding write or read address as a floating address. Fault notifying unit monitors the number of floating addresses to determine whether or not the number of floating addresses is greater than a preset threshold, and makes notification of fault if the number of floating addresses has become greater than or equal to the threshold.

Address fault monitoring device and ATM switching device

Three different color light beams which are converged to a single light spot on the surface of a circuit board at predetermined incident angles, are irradiated onto the top surface of an electronic part mounted on the circuit board, then distances between the positions of the top surface of the electronic part to which the light beams are irradiated respectively, from the single light spot on the surface of the circuit board are measured, and the height and an inclined angle of the top surface of the electronic part are computed in accordance with the relationship between the measured distances and the incident angles.

Visual inspection method for part mounted on printed circuit board

Growing community of inventors

Yokohama, Japan

Hiroo Uchiyama