Fujitsu Corporation

Koji Hachiya

Yasuyuki Mitsumori

Tetsuo Ehara

Yuichiro Katsura

Junichi Kawaguchi

Kanta Yamamoto

Satoru Saitoh

Yoshiyuki Karakawa

Yuji Kuroki

Masaki Bansho

Yasayuki Mitsumori

A communication device includes a processor that is operative to perform actions, including, determining whether a failure occurs in a regular communication channel to transmit a packet to another communication device, selecting, upon determining that the failure occurs in the regular communication channel, a backup communication channel for transmitting the packet, determining, upon selecting the backup communication channel, whether the backup communication channel is shared by the regular communication channel and another regular communication channel, changing, upon determining that the backup communication channel is shared, a priority assigned to the packet transmitted from the regular communication channel to the backup communication channel, and controlling the transmission of the packet in accordance with the changed priority.

Communication device and method for controlling transmission priority related to shared backup communication channel

A communication control device includes a storage unit configured to store source addresses and destination addresses of one or more frames, a determination unit configured to determine respective access proportions for types of accesses to the storage unit, in accordance with an empty state of the storage unit, the empty state being a proportion of the number of empty entries in the storage unit to the total number of entries, and a control unit configured to control whether to access the storage unit, based on the access proportions determined by the determination unit and proportions for accesses having been made to the storage unit.

Communication control device and method

There is provided a packet transmission device which comprises a packet transfer processing part and a control part. The packet transfer processing part includes a table memory comprising a path selection table, a link status table, and a node status table. In these tables, information of each of paths, links, and nodes are stored and linked each other. A link/node status monitoring part in the control part monitors a packet outputted from the packet transfer processing part transmission and detects a fault occurred in a transmission of the packet. The fault is reflected on the information of paths in the tables only by updating the information of links and nodes and the path for packets outputted from the device is assigned in a short time.

Packet transmission device

A packet processing apparatus includes a plurality of communication connecting unit each connected with a communication partner apparatus using one of a work path and a protection path, connecting unit for connecting, using a data bus, the plurality of communication connecting unit with one another; determination unit for, when a packet sent from the communication partner apparatus is received by one of the communication connecting unit, determining whether the packet is a maintenance packet that is used for monitoring a connection state with the communication partner apparatus; and transmitting unit for, when it is determined that the packet is a maintenance packet by the determination unit, transmitting the maintenance packet to the plurality of communication connecting unit using the data bus via the connecting unit.

Packet processing apparatus, interface unit and method thereof

A packet forwarding device includes a storage that stores a path selection table in which link numbers of a Work path and a Protection path for each flow number of a transfer packet, a flag that indicates whether the link is made up of a plurality of physical lines, a link aggregation number that identifies an aggregation of the plurality of physical lines, and destination information are set in association with one another, a link status table, a node status table, and an LAG status table, and a path selection processor that selects a path that outputs the packet on the basis of the information.

Packet forwarding device and control circuit thereof

An aspect of the embodiments related to a packet transmission apparatus includes a user identification unit for identifying the user of an input user flow upon input of the user flow containing communication packets and maintenance packets, a maintenance packet extraction unit for extracting the maintenance packets from the user flow of the user identified by the user identification unit, a maintenance packet output control unit for controlling the transparent output of the maintenance packets extracted by the maintenance packet extraction unit based on the monitor rate setting, and a control unit for monitoring and controlling the user flow of the particular user based on the maintenance packets of the user transparently output by the maintenance packet output control unit.

Packet transmission apparatus and packet transmission method

A signal distribution method and a signal distribution apparatus are disclosed, wherein transport packets of a television signal containing multiplexed channels are provided in a transmission format of a digital broadcasting standard, and such transport packets are transmitted and distributed over a synchronous network. Transmission rate (data speed) of the transport packets of a given customer in the synchronous network is selectable based on the number of multiplexed channels for the customer.

Growing community of inventors

Fukuoka, Japan

Koji Hachiya