Nec Corporation

Juniper Networks, Inc.

Kenshin Yamada

Motoo Nishihara

Michio Masuda

Yasuhiro Miyao

Akira Arutaki

Takafumi Sera

Toshiaki Arikawa

An application monitor apparatus is provided that enables feedback to be sent to a transmitting terminal without relay processing of application data in the application layer. A packet transmission decision unit outputs to an application monitor unit and a packet transmitting unit only packets for which transmission is authorized by both the application monitor unit and the packet transmitting unit. When monitoring processing of the application monitor unit is slower than the rate of receiving packets at a packet receiving unit, the packet transmission decision unit sends feedback to the packet receiving unit to delay the transmission of packets.

Application monitor apparatus

A datagram relaying apparatus includes a plurality of protocol terminating units, and a destination determining processor. The destination determining processor includes a path selecting section which determines a transfer destination route for a stream of packets received from any of the protocol terminating units. The path selecting section determines whether or not transfer of the received stream of packets to the transfer destination route is in an inhibition state, and selects another transfer destination route when the transfer of the packet to the transfer destination route is in the inhibition state.

Datagram relaying apparatus with load distributing function

A communications apparatus for directly transferring payload data included in a received packet to an application memory area. The communications apparatus comprises an error check unit for checking the payload data for an error, a write processing unit for performing write processing for writing the payload data into the application memory area, and a protocol processing unit for causing the write processing unit to start write processing to write the payload data into the application memory without waiting for the completion of the error check, and upon detection of an error, returning a valid section in the application area that has been overwritten by write processing to an invalid section which has not stored normal data.

Communications apparatus and communication method

A multi-layer class identifying communication apparatus, includes an input interface connected to input communication lines; a switch circuit; and an output interface connected to output communication lines. The input interface comprises an allocating section which determines a class identifier indicative of one of classes to which an IP packet belongs, from header data of the IP packet received through one of the input communication lines, and allocates an IP-QOS (Internet-Protocol-Quality-of-Service) code to the IP packet. The switch circuit selects one of the output communication lines based on a destination address of the IP packet, such that the IP packet is outputted from the output interface to the selected output communication output interface.

Multi-layer class identifying communication apparatus with priority control

An apparatus for scheduling packets for presenting a plurality of classes, includes (a) a buffer which accumulates received packets in each of the classes, (b) a token administrator which judges whether it is allowed to transmit a packet in each of the classes by virtue of a token associated with each of the classes, (c) a scheduler which determines a class to which a packet to be transmitted belongs, based on the judgment carried out by the token administrator, and (d) a controller which reads a packet of the class determined by the scheduler, out of the buffer, and transmits the thus read-out packet. The token administrator includes a single first circuit for carrying out subtraction of a token and a single second circuit for carrying out addition of a token, and carries out subtraction and addition of a token for each of the classes by means of the single first circuit and the single second circuit.

Apparatus for scheduling packets and method of doing the same

A transfer destination determining apparatus and method performing a load distribution in a network, where a plurality of transfer destination subjects are present as a transfer destination of a datagram, while the same collected flows are transferred to the same transfer destinations, the transfer destinations are allocated with respect to each of the collected flows. This apparatus has an extracting part extracting address and flow discrimination information, in the IP datagram; route solving part determining a transfer path based on the address information. When the determined path is a single path, the transfer destination is uniquely determined and the path is outputted to a post-staged apparatus, whereas when the path is a multi-path having a plurality of transfer destination subjects a multi-path number is outputted to a flow managing means which determines a transfer path corresponding, to a collected flow based on the received flow discrimination information and the multi-path number.

Transfer destination determining process apparatus

A lightwave network data communications system having such an architecture that routing operation within a lightwave network is simplified, and a high-speed transfer process is attained in a large-scale basic network utilizing a wavelength division multiplexing (WDM) technology which accommodates internet traffics from a plurality of subscriber networks. The lightwave network data communications system includes a unit for giving a lightwave router address to an edge router and a core router in the lightwave network, a unit for resolving a destination lightwave router address and an aggregated flow identifier about an IP packet received from a subscriber, and encapsulating the IP packet into a lightwave adaptation frame with these pieces of data contained in header information in the edge router, a unit for encapsulating a plurality of packets each having a length under a fixed length into a superframe, a unit for executing a share-ride scheme in which the packets of a plurality of IP flows can be shared as a superframe, and a unit for monitoring the traffic on the superframe basis and regulating an excessive traffic.

Lightwave network data communications system

A communication control unit is provided which is capable of retrieving a path regardless of a length of an address to be retrieved, of reducing a scale of its circuit, of achieving a high speed processing of retrieval and of preventing an increase in memory size required. The communication control unit is composed of a retrieval data managing circuit adapted to represent a node of a path tree corresponding to a path table by a split address obtained by setting-off a real address by one byte and a split mask length and to produce an address comparison byte composed of four stages obtained by setting-off a retrieving address by one byte and a next node selection byte, a nex-node selecting circuit adapted to decide a node to be retrieved next based oil the next node selection byte and a path retrieving circuit adapted to compare valid address portion showing a split mask length out of the split address with a split mask length portion of the address comparison byte.

Communication control unit

A communication control apparatus includes an input and output unit responsive to reception of a packet, for generating a search request and a destination address of the packet to receive a resultant route data, and for transmitting the packet based on the resultant route data. A memory stores a route tree table having a tree structure of a plurality of nodes, each of which has a node data. A route searching circuit refers to the route tree table in response to the search request to determine a route data of a final node data as the resultant route data from the destination address, and outputs the resultant route to the input and output unit.

Route searching circuit and communication apparatus using the same

A communication quality control system for deciding an optimum communication quality in a received datagram to transfer the datagram, in which not only a destination is decided according to the data of the protocol layer and beneath included in the datagram, but also attribute information of communication is taken out by an attribute detecting unit, according to the information of the respective protocol layers , and or one of them, and communication quality for sending the datagram is decided by a communication quality deciding unit and a connection communication quality control unit, according to the quality information of connection corresponding to the attribute information taken out.

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Tokyo, Japan

Kenshin Yamada