摘要:
A switching apparatus for learning a source address set in a packet in an address learning table and delivering a packet on the basis of an address learned in the address learning table includes an address learning unit for limiting a number of learned addresses such that a number of learned addresses for each user group in the address learning table is equal to or less than an address learning upper limit value for the user group.
摘要:
A packet switching device for receiving and forwarding a packet, comprises a counter for indicating a storage capacity of specified packets in stored packets, and means for starting a forwarding restriction of the specified packets if the counter exceeds a preset forwarding restriction start threshold value. The forwarding restriction is a process of, e.g., lowering a priority of the specified packets in the received packets. The packet switching device further comprises means for canceling the forwarding restriction when the counter becomes smaller than a preset forwarding restriction terminating threshold value.
摘要:
An apparatus for controlling buffering of an arrival packet. The apparatus includes a packet buffer for temporarily storing each of one or more packets to be transmitted in association with an arrival time thereof, and a packet discard section for determining an arrival packet to be discarded or to be stored in the packet buffer, based on a discard condition defined by using a packet residence time that is calculated on the basis of one or more residence times of one or more packets staying in the packet buffer, wherein the arrival packet is defined as a packet that has newly arrived at the apparatus.
摘要:
In a data transmission device and method provided with e.g. duplexed switches outputting frames in the order of input for continuing the communication without instantaneous interruptions even though one of the switches are faulted, input interfaces generate frames in which every time data is inputted, input order information indicating the input order is added to the data together with unique information of each input interface and providing the frame generated to the switches in parallel. At least one output interface sequentially stores the frames outputted from the switches for every unique information and selects a first arrived frame among the frames stored with same input order information.
摘要:
In a packet relay method and device which can reduce a congestion of switching even when segment data are concentrated, segment data dividing portions respectively extract a destination address and a packet length from received packets, divide the packets into predetermined length data based on each packet length, and generates location information indicating locations in the packets respectively for the data. The segment data dividing portions add segment headers in which the location information, the destination address, and an address of its own device as a source address are set are added to each of the data, generate segment data, and provide the segment data to switches within a switch card in parallel.
摘要:
A switching device provides a technique for detecting, in a switch equipped in a layer-2 network, frame forwarding loops in a network. The switching device comprises an interface part operable to input a frame, a switching part operable to switch in accordance with a destination address of the input frame, a comparing part operable to compare a switch identifier recorded in the input frame with its own switch identifier, and a notifying part operable to provide notification of a match when comparison results obtained by the comparing part match.
摘要:
The semiconductor device of this invention includes a substrate having an insulating surface and a thin film transistor formed on the substrate, wherein the thin film transistor has a semiconductor island including a channel region and source/drain regions, a gate insulating film formed on the semiconductor island and a gate electrode covering the channel region of the semiconductor island interposing the gate insulating film therebetween, and wherein a distance between an edge of the channel region of the semiconductor island and the gate electrode is larger than a distance between a central portion of the channel region of the semiconductor island and the gate electrode.
摘要:
A signal processor includes a processor that counts the number of input data pieces or a size of each of the input data pieces; a first memory that stores a result of the counting by the processor; and a second memory that records whether the result of the counting exceeds a capacity of the first memory.
摘要:
A queue selection method for controlling selection of many queues without increasing the circuit scale is provided. Queues are organized into groups, and each group is created as a tree structure with a plurality of steps, and a queue is selected by selecting a group of each step. By this, even if the number of queues is enormous, it is sufficient to provide registers for managing the presence of packets only for the number of groups selected in each step, and it becomes unnecessary to provide registers for all of the queues, so an increase of registers can be suppressed even if the number of queues increases. It is preferable that group selection in each step is performed in parallel independently from pipeline processing so as to maintain high-speed operation.
摘要:
A fabrication sequence of a thin film transistor, in which a photoresist film is used as an ion doping mask to shield a portion of an amorphous semiconductor layer larger than a gate electrode formed above in width (gate length). The mask is designed by pre-calculating the accuracy of the alignment and etching, so that the gate electrode overlaps neither the source region nor drain region. Thus, it has become possible to form the gate electrode in such a manner not to overlap the source region or drain region while securing an impurity-free offset region. As a result, the present thin film transistor can reduce the OFF-state current and renders excellent OFF-state characteristics, and therefore, when employed in a liquid crystal display device, the resulting liquid crystal display device can prevent display defects, such as a flicker.