Nec Corporation

Juniper Networks, Inc.

The Tokyo Electric Power Company, Incorporated

Ryota Motobayashi

Fumiyasu Hayakawa

Kazuhiko Azuma

Hayato Momma

Mayumi Hara

In an asynchronous transfer mode switch, a plurality of queues is provided for accumulating transfer cells, and a queue assignment processing section, receives a message for establishing a connection and assigns to the connection one of the queues having a forwarding rate close to a declared rate included in the message and not exceeding the declared rate.

Switch with function for assigning queue based on a declared transfer rate

Switch with function for assigning queue based on a declared rate transfer

Switch with function for assigning queue based on forwarding rate

In an ANS used for a television conference between calling and destined conference room terminals accommodated in an ATM network, an address of each conference room terminal is stored in an address database as address resolution data which have no hierarchical structure and which therefore uniquely define each conference room terminal. A priority level of each conference room terminal is also stored in the address database and is referenced on occurrence of congestion so as to determine whether or not a connection is released during a conference. Reservation data may be stored in the ANS together with topology data and connection data.

ANS designed for a conference between conference room terminals and network system including the ANS

A monitor () receives a returned response message, and stores the state of the link directed to the NE that returned the message as a successful transmission, and then repeats the same operation at arbitrary intervals. When the monitor can not receive the response message after placing a certain interval, it stores the link as an unsuccessful transmission. At this point, if all the links for a particular NE are in the unsuccessful state, the monitor informs an NMS () of a fault in that NE. If the NE truly has the NE fault, other NEs that also have the links to that fault NE inform the NMS of the fault. Thereby the NMS itself does not need to do the monitoring. The NMS only collates fault information with topology information stored in a topology information storage () and can judge that a particular NE is out of communication and control.

Network system, detection method and monitoring method of network entity faults, and storage medium

Asynchronous transfer mode switch with function for assigning queue having forwarding rate close to declared rate

In an internet protocol switch including a controller and a switch section controlled by the controller, the switch section includes an input cell buffer for receiving cells input to the switch section. The output of the input cell buffer is closed during a transition time from a selected flow connection linked to the input cell buffer and the controller, to a cut through connection linked to the input cell buffer without linking to the controller. Then, after the cut through connection is established, the output of the input cell buffer is opened.

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Tokyo, Japan

Ryota Motobayashi