Hitachi, Ltd.

Hitachi Telecom Technologies, Ltd

Toshimichi Noake

Tadashi Tamaoki

Toru Aramaki

Sadato Ando

Katsuya Ohwada

Mitsumasa Mori

Toshiki Ichikawa

Shigeo Arai

A communication network capable of establishing an SVC bypass route when a failure occurs in a PVC multiplexed line wherein each of ATM switches at both ends of a PVC stores the relations of SVC specifying information and the other party PVC information in association with each PVC in a management table. At the time of bypassing, one of the switches transmits a message including the other party PVC information to another ATM switch for each PVC to be bypassed and another ATM switch specifies a PVC to be switched on the basis of the received message and switches the PVC to an SVC specified by the corresponding SVC specifying information stored in the management table.

Virtual connection switching method and ATM switch

In an ATM network having a non-ATM apparatus such as a PBX, a band and various apparatuses are effectively used by employing SVC, so that a ring back tone, etc., is transmitted to the non-ATM apparatus of originating side. An ATM signaling apparatus comprises a signaling convert section for making conversion of signaling information between an ATM network and a PBX , and a cell assembly and disassembly section (CLAD) for cell assembling and disassembling user information. An ATM signaling interface section receives and transmits ATM signaling information from/to the ATM network , and sends a user VC connect and a release indication to the CLAD section . An non-ATM signaling interface section receives and transmits PBX signaling information from/to the PBX . User information and a user information cell sent from the PBX 230 and the ATM network is cell assembled and cell disassembled by the CLAD section

ATM communication apparatus and ATM signaling method

The present invention intends to realize highly reliable communications between a frame relay network and an ATM network by corresponding service classes decided in both networks to each other. In order to achieve the above object, the frame relay data communication apparatus of the present invention used to allow communications between the frame relay network and the ATM network is provided with a frame receiver unit for receiving frame data from the frame relay network; a cell assembly unit for assembling received frame data into ATM cells and transmitting assembled cells to the ATM network; and a controller for controlling both frame receiver unit and cell assembly unit so as to extract priority order information from received frame data and receive priority order information of data used in ATM networks from an ATM network and decide a service class of the received data to assemble the received frame data into cells according to the decided service class.

Method and apparatus for communications of frame relay data

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Yokohama, Japan

Toshimichi Noake