Abstract: A gas insulated switchgear is provided which uses an SF6 substitute gas as an insulating gas and thus causes reduced environmental load while achieving high dielectric strength and excellent interrupting performance. The gas insulated switchgear includes a switchgear housed in a container filled with an insulating gas.

Abstract: A message division communication method and system are disclosed for a communication system comprising a host, an intermediate device connected to the host through a high-speed bus and a remote device connected to the intermediate device or the host through a low-speed bus. A message is transmitted in such a manner that the host designates and notifies the remote device of a maximum message length determined in a way corresponding to the transmission rate of the low-speed bus and divides the message into division messages each not exceeding the maximum message length thereby to transmit and receive the division messages between the host and the remote device. Even with a communication system in which low-speed and high-speed buses coexist, a message can be transmitted and received by a common communication control scheme.

Abstract: In an ATM switching unit, action information indicative of a cell of a presently operable system is stored into such a cell received from a line which is used as the line for the presently operable system, among cells received from duplicated lines, and also standby information indicative of a cell of a spare operation system is stored into such a cell received from a line which is used as the line for the spare operation system in an individual unit. Thereafter, the cells are transferred to a common unit. In this common unit, the cell into which the standby information has been stored is discarded by an IVC unit. Subsequently, transfer destination address information of the cell into which the action information has been stored is specified, and this specified cell is transferred to an output path thereof.

Abstract: In an ATM switching unit, action information indicative of a cell of a presently operable system is stored into such a cell received from a line which is used as the line for the presently operable system, among cells received from duplicated lines, and also standby information indicative of a cell of a spare operation system is stored into such a cell received from a line which is used as the line for the spare operation system in an individual unit. Thereafter, the cells are transferred to a common unit. In this common unit, the cell into which the standby information has been stored is discarded by an IVC unit. Subsequently, transfer destination address information of the cell into which the action information has been stored is specified, and this specified cell is transferred to an output path thereof.

Abstract: In a path audit control method, (1) a unit (a discrete unit or common unit) within a switch holds bitmap information indicating whether each channel identifier is being used to establish a path; (2) a central controller sends the unit bitmap information indicating whether each channel identifier has been used to establish a path; (3) the unit compares bitmap information which it itself is holding with bitmap information that has been sent from the central controller; and (4) if the bitmap information held by the unit and the bitmap information that has been sent from the central controller do not match, the central controller and the unit cooperate to execute matching processing in such a manner that the compared items of bitmap information will be made to match.