Hitachi, Ltd.

Mami Oka

Shigeki Satomi

Naoki Ono

A method of and apparatus for controlling a data transfer by a transfer deliverer node from a terminal equipment belonging to the transfer deliverer node to another node, in a network system having a plurality of nodes connected to a public switched network and a plurality of terminal equipments connectable to a corresponding node. At each node, a discriminator specific to each terminal equipment belonging to the transfer deliverer node is registered in advance in a first memory; a discriminator specific to a user of each terminal equipment is registered in advance in a second memory for each terminal equipment belonging to the transfer deliverer node; in response to a data communication request from the terminal equipment belonging to the transfer deliverer node, the discriminator of the terminal equipment and the discriminator of a user of the terminal equipment, respectively sent from the terminal equipment, are received; it is judged if the received discriminator of the terminal equipment is being registered in the first memory; it is judged if the received discriminator of a user of the terminal equipment is being registered in the second memory as a discriminator of the user of the terminal equipment; and in response to the judgment results, it is determined if a data transfer from the terminal equipment is permitted or not.

Method and apparatus for data transfer and circuit setting for

In a network system in which a line switching unit and the other line switching unit are connected with each other via communication lines and backup lines, and nodes which are connected with both the line switching units, respectively are adapted to communicate with each other via either one of the communication lines and backup lines and both line switching units, a line switching system wherein a network control unit is connected with the line switching units, said network control unit having, in a table, information on connecting mates of said communication and backup lines an information on a plurality of groups of communication lines each grouped based upon the former information, the network control unit being adapted to select a relevant group based upon the group information when a failure occurs in the communication lines for issuing an instruction for collectively switching a plurality of communication lines belonged to the group, whereby said line switching unit which has received the instruction performs switching to the relevant backup lines.

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Kawasaki, Japan

Mami Oka