Fujitsu Corporation

Eitarou Hiraga

Toshikatsu Atarashi

Hideyasu Kanemaki

Minoru Yamaguchi

Satoshi Fudatate

Takeshi Kimura

Takeshi Okamoto

Naokazu Kawamura

The present invention concerns a transmission bandwidth sharing system and provides, in particular, a transmission bandwidth sharing apparatus used in an ATM exchange for sharing one CBR bandwidth on an ATM line among a plurality of ATM terminals in a multimedia network or the like. The CBR bandwidth sharing apparatus comprises a bandwidth management table for registering bandwidth and information relating to the bandwidth for each identified CBR bandwidth, a bandwidth sharing management table for registering, for each identified CBR bandwidth, one or more terminals that use the bandwidth for CBR communication and information relating to the one or more terminals, and a signal transmission timing management table for registering valid signal transmission timings of the registered terminals for each identified CBR bandwidth. Based on the bandwidth information and terminal information, the CBR bandwidth sharing apparatus allocates a timing in an invalid signal transmission period of one of the registered terminals for use as a transmission timing of a valid signal from another one of the registered terminals, thereby enabling a plurality of CBR communication connections to be established by sharing the identified one CBR bandwidth.

Transmission bandwidth sharing system

A network system of the present invention is constructed of first to third terminal equipments connected to a network. In the case of establishing such a plurality of connection calls that a plurality of connections belong to one call between the first and second terminal equipments, if unable to set all the connections between the first and second terminal equipments, the network sets the connections capable of ensuring bandwidths between the first and second terminal equipments, and sets a remaining connection between the first and third terminal equipments.

Network system and switching unit

An ARP server which can inform a calling terminal of an address suitable for an intended communication with a receiving terminal among a plurality of addresses usable for that purpose. The ARP server is equipped with an ATMARP table consisting of a plurality of unit tables each of which correlates an IP address and a plurality of ATM addresses. When receiving an inquiry about an ATM address corresponding to a certain IP address, the ARP server checks free bandwidths of circuits relating to respective ATM addresses in a unit table that corresponds to the IP address of interest, and informs the terminal that issued the inquiry of an ATM address with the largest free bandwidth.

ARP server

Growing community of inventors

Kawasaki, Japan

Eitarou Hiraga