摘要:
A packet switch having a structure of writing a variable length packet received from each of input lines into a shared buffer memory on a fixed length data block unit basis, wherein a buffer controller forms an input queue for each input line and, when the last data block of a variable length packet is registered in the input queue, links a linked address list for the input queue to one or a plurality of output queues corresponding to one or a plurality of packet destination output lines.
摘要:
In a packet switching apparatus capable of multicast, the length of a bitmap added to a multicast packet is made variable, depending on the number of line interface cards housed in the packet switching apparatus.
摘要:
A plurality of address chains are assigned to each of such flows as output lines, priority control, etc. in the address management carried out in a switch with a shared buffer. Each of the address chains has a write address register 20 and a read address register 30. The switch is also provided with a distributive pointer 22 for distributing cells in a flow to a plurality of address chains and a write address register selector 21, as well as a read pointer 32 for reading packets from a plurality of the address chains and a read address register selector 31 so as to read the packets through a pipeline with use of those plural address chains.
摘要:
An ATM switch that can be expanded to form a large scale ATM switch with minimal hardware additions. The ATM switch includes a plurality of ATM switch units arranged in parallel, a plurality of cell distributors arranged on the input side of the ATM switch units, and a plurality of cell assemblers arranged on the output side of the ATM switch units. Each of the cell distributors distributes ATM cells received from a plurality of incoming highways to a buffer memory having a plurality of queues corresponding to the output ports of the ATM switch units, namely destinations of the ATM cells, and stores the ATM cells to the queues in the buffer memory. Each cell distributor reads ATM cells having the same destination information, and outputs such ATM cells to respective ones of the ATM switch units in parallel. Each of the ATM switch units independently exchanges the received ATM cell in parallel with the other ATM switch units. Each of the cell assemblers multiplexes ATM cells received from the ATM switch units in a manner to preserve the time sequential order of the ATM cells, and outputs the ATM cells to one of a plurality of outgoing highways. A desired increase in the capacity of the ATM switch is implemented by adding an ATM switch unit between the cell distributors and the cell assemblers, thereby allowing for an increase in hardware in proportion to the desired increase in capacity.
摘要:
A traffic shaper comprises a bandwidth controller 40 having a plurality of leaky bucket units 41-1 to 41-n prepared in correspondence with buffer memories 20-1 to 20-n, and an output queue designation unit 43 for specifying a buffer memory from which a packet is to be read out. Each of the leaky bucket units 41 has a level counter 416 for decrementing the count value at a predetermined rate, and a level increaser 411 to 417 for increasing the count value of the level counter by a value proportional to the product of the length of a transmitted packet and a unitary increment value which is variable depend on the current count value of the level counter.
摘要:
There is provided a sensor node management method in which a user is unconscious of a service break even when a sensor mode has failed among a plurality of sensor nodes assuming intermittent operation. Moreover, it is possible to provide a flexible sensor node management method capable of freely modifying the observation grading (space, time) in accordance with a user's desire. A base station (30) for containing a plurality of intermittently operating sensor modes includes a sensor management table (4) for managing the sensor nodes, a group management table (5) for grouping a plurality of sensor nodes, and an operation timing control unit (3). The operation timing control unit (3) decides the operation interval and the relationship for starting each of the sensor nodes. Moreover, the base station and the sensor node have a counter value as a reference of the sensor node operation interval and the operation start phase, which are periodically synchronized.
摘要:
In an organization dynamics analysis service using a sensor, organization dynamics information is understandably provided to a lot of members on a customer side without receiving private information such as an individual name from the customer. Therefore, a sensor data associated with an ID is received from the customer site, and organization analysis is performed on a service provider side, and then, an organization analysis data based on the ID is fed back to the customer site. When the customer browses the organization analysis data, the ID is converted into the private information in a service gateway installed on the customer site in accordance with a conversion table for correspondence of the ID previously specified on the customer side and the private information (individual name), and is shown to the customer as the understandable information.
摘要:
A sensor net system including: a plurality of sensor nodes, where each sensor node is held on a person of a differing worker, and each sensor node includes; a sensor which obtains sensor data of a worker; a radio frequency circuit which notifies a server of the sensor data; and a server which includes: a unit for storing a relation list for correlating the sensor data with a work category of the worker; a unit for confirming location of the worker based on the obtained sensor data; and a unit for confirming a work category in which the worker is engaged based on the confirmed location and the relation list.
摘要:
Face-to-face detection by infrared-ray communication is effective in grasping interaction between persons. However the problem here is that infrared rays have a high directivity and detection fails unless the persons face each other right in front. Sensor signals having a high directivity and sensor signals having a low directivity are obtained from a sensor terminal (TR) carried by a person. Firstly, information on relative position is obtained with a sensor (TRIR) of infrared rays or the like having a high directivity and an initial group is formed at an application server (AS). A feature amount such as sound that has a low directivity and can sense surrounding environmental information is extracted from among the terminals (TRs) belonging to the initial group by personal feature extraction (ASIF), correlation with terminals (TRs) not belonging to a group is obtained, and thereby whether or not those terminals (TRs) belong to an identical group is judged.
摘要:
A sensor network system, including: a model list that stores preset model names; an event table that stores monitoring conditions of data transmitted from sensor nodes; an event generator that receives data corresponding to the model names from the sensor nodes, and notifies an occurrence of an event when receiving data satisfying the monitoring conditions from the sensor nodes; and an event-action controller including an action executer that executes processing previously specified when the occurrence of an event is indicated from the event generator.