Abstract: In a network monitor system having a plurality of line cards, each of the line cards monitors a communication data amount in consideration of a group or a finer group with conditions other than an IP address added thereto. Each of the line cards controls the communication data amount by the use of a line interface section 11, a header extraction section 12, a flow identification section 13, and a counter section 16.

Abstract: An asynchronous transfer mode (ATM) exchange includes an ATM switch (120), an ATM line card (110), a server card (130), and an Ethernet line card (140). The server card (130) converts an ATM cell including connection data, into a network layer packet, extracts a network layer next hop out of the network layer packet, converts the network layer next hop into associated connection data, and converts the network layer packet and connection data into an ATM cell. The Ethernet line card (140) converts the ATM cell into a network layer packet, extracts the connection data out of the ATM cell, converts the connection data into a shared medium address, and converts the network layer packet and shared medium address into a shared medium frame.

Abstract: In the data communication system, a terminal station includes a data buffer and a terminal station side finite state machine for, when data is accumulated at the data buffer, periodically making a request for allocation of time slots to a base station until the accumulated data is all transmitted, and the base station includes a base station side finite state machine for, when accepting a time slot allocation request from the terminal station, if a free time slot exists, allocating the free time slot to the terminal station in question and if not, making other terminal station which has been already allocated a time slot release the allocated time slot and allocating the released time slot to the terminal station which has made the time slot allocation request, and the terminal station transmits data using a time slot allocated by the base station side finite state machine.

Abstract: To provide all ATM exchange wherein more supple collective routing than VP routing is enabled without waste of VPI/VCI resources, an ATM exchange comprises: a VPI/VCI converter (1) for retrieving a logic value, which is predetermined for each of individual connections to be dealt with individually and groups of connections to be dealt with collectively, according to an input VPI/VCI value; a mask-bit generator (2) for generating a mask-bit pattern, a number of lower bits of the mask-bit pattern having logic ‘1’ and other upper bits thereof having logic ‘0’ when the mask-bit pattern concerns one of the groups of connections; and a VPI/VCI bit selector (3) for generating an output VPI/VCI value to be written in the VPI/VCI field of the cell, by selecting logic of each bit of the output VPI/VCI value to have the same logic with a corresponding bit of the logic value outputted from the VPI/VCI converter (1) when a corresponding bit of the mask-bit pattern has logic ‘0’, and to

Abstract: In a network monitor system having a plurality of line cards, each of the line cards monitors a communication data amount in consideration of a group or a finer group with conditions other than an IP address added thereto. Each of the line cards controls the communication data amount by the use of a line interface section 11, a header extraction section 12, a flow identification section 13, and a counter section 16.

Abstract: The present invention provides a router device capable of using separated queues with arbitrary fineness and flexibly achieving assurance and separation of traffic. Flow identifier 2 detects a flow of packets input to the device. Flow monitor 1 detects color information indicating match (Green) of actual traffic to a previously defined bandwidth under contract for each flow, temporal violation (Yellow), or complete violation (Red). Forwarding searcher 3 determines, from contents of a packet, output line information indicating from which line the packet is to be output. In-device packet controller 4 adds in-device cell header information to a packet input thereto, converts it into a form in the device (an in-device cell), and sends it to input side in-device cell buffer 5.

Abstract: An asynchronous transfer mode (ATM) exchange includes an ATM switch (120), an ATM line card (110), a server card (130), and an Ethernet line card (140). The server card (130) converts an ATM cell including connection data, into a network layer packet, extracts a network layer next hop out of the network layer packet, converts the network layer next hop into associated connection data, and converts the network layer packet and connection data into an ATM cell. The Ethernet line card (140) converts the ATM cell into a network layer packet, extracts the connection data out of the ATM cell, converts the connection data into a shared medium address, and converts the network layer packet and shared medium address into a shared medium frame.

Abstract: In a longest coincidence data detecting apparatus, a control section distributes an external data to the N M-bit associative memory units to satisfy a relation of X.sub.ij =Y.sub.Nj+i where each of N and M is an integer more than 1, 0.ltoreq.i<N, 0.ltoreq.j<M, i and j are integers, X.sub.ij is a j-th bit of the i-th one of the N associative memory units, and Y.sub.k is a k-th bit of the external data. Each of the N associative memory units compares a distributed portion of the external data and a corresponding portion of an internal data in a designated bit region from a most significant bit of the distributed portion, and outputs a matching signal when the distributed portion of the external data portion and the corresponding portion of the internal data are coincident with each other in the designated bit region.