Miwako Watanabe

Bio: Miwako Watanabe is an academic researcher from Fujitsu. The author has contributed to research in topics: Header & Line (text file). The author has an hindex of 2, co-authored 4 publications receiving 59 citations.

Switching equipment for performing a switching operation for a high-speed packet in broadband Integrated Services Digital Network

Abstract: Switching equipment in provided for performing a switching process of a fixed length cell consisting of data and a cell header. A line interface provided in the switching equipment accommodates a plurality of lines and, at the same time, processes the data from each line on a cell unit. The line interface includes individual units and a common unit. The individual units are individually connected to the plurality of lines accommodated therein and individually process the cells. The common unit is connected to the individual units and, at the same time, effects batch-processing of the cells processed by the individual units.

Cell flow rate controller

Abstract: PROBLEM TO BE SOLVED: To efficiently transmit cells without exceeding the limit of a band parameter by integrally controlling peak cell rate(PCR) and sustainable cell rate(SCR) on a cell transmission-side. SOLUTION: A band control part 4 judges the transmission time of the cell in a buffer 1 based on the band parameter and cell transmission history and indicates the transmission of the cells to a read control part 3. The read control part 3 reads the cells from the buffer 1 in accordance with an indication from a band control part 3 and transfers them to the cell transmission part of a cell transmission device. The most efficient cell transmission control for satisfying the conditions of PCR control and SCR control becomes possible in the transmission-side from a terminal to a network or a transmission-side from the network to the other network. Thus, cell abolishment caused by the judgment of non-conformity by an UPC/NPC(usage parameter control/network parameter control) function at the entrance of the network in a transmission destination can be prevented. Since PCR control and SCR control are integrated, buffers for accumulating the cells are not necessary to be separately provided, and the quantity of hardware can be reduced.

Line associated operation device for atm exchange

Abstract: PURPOSE: To make the size of the line associated operation device small. CONSTITUTION: A line associated operation section 3 processes information from a subscriber terminal equipment 1 connecting to a subscriber terminal equipment 1 in th unit of cells. An SDH termination section 12 terminals a synchronization digital hierarchy multiplexing hierarchically the capacity of a transmission line through which an electric signal converted by a photoelectric conversion section 11 is sent. A cell synchronization section 13 detects a synchronizing signal of a cell by applying error control to the cell based on header error control information written in a cell header. A header conversion section 18 converts a virtual path identifier written in the cell header into a virtual path identifier being a destination by referencing a conversion table 180a storing the virtual path identifier written in the cell header and a destination virtual path identifier with cross reference. COPYRIGHT: (C)1995,JPO

Atm exchange provided with multi-casting function

Abstract: PURPOSE: To provide various ATM exchanges provided with a multi-casting function. CONSTITUTION: Header converters 111 -11N provided in incoming highways #1 in-#Nin add tag information for specifying plural outgoing highways #1out-#Nout to inputted ATM cells, replace VCIs with internal identifiers and perform output. A switching part 12 routes the ATM cells to the plural outgoing highways based on the tag information of the ATM cells and the header converters 131 -13N provided in the respective outgoing highways convert the internal identifiers of the ATM cells to the normal VCIs and perform transmission (an internal copying system). Also, a copy server 331 is provided, plural copy cells are outputted by the copy server, one copy cell is recursively returned to the copy server, the remainder is transmitted to the outgoing highways and the copy cells are recursively routed to the copy server 331 until the required number of the copy cells are multi-casted (a recursive copy type trunk system).

Allocated and dynamic bandwidth management

Abstract: An ATM network switch and method of utilization for adaptively providing integrated services therein is disclosed. In providing such integrated services, if the allocated bandwidth for one connection has been consumed, or if the connection is not entitled to allocated bandwidth, the connection can optionally use dynamic bandwidth arbitration, or a combination of both allocated and dynamic. The switch includes an input port processor, a bandwidth arbiter, and an output port processor. Cells are transmitted from the input to the output, under the control of respective port processors and the bandwidth arbiter. Flow control is implemented on a per-connection basis. Individual queues are then assigned to traffic type groups in order to provide traffic type flow control. Based upon prioritization information associated with the cell at the input, cells are prioritized and transmitted from the output, with each cell maintained in the same order, relative to other cells on a connection, in which it was received.

Asynchronous transfer mode based service consolidation switch

Abstract: An asynchronous transfer mode (ATM) based service consolidation switch (10) includes an input/output module (22) having a to-switch port (TSPP) processor (90) and a from-switch port processor (FSPP) (92). The TSPP (90) and the FSPP (92) communicate with a bandwidth arbiter (114), multipoint topology controllers (116), and a data crossbar (117) on a switch control module (32). The TSPP (90) receives traffic over links for conversion into an internal cell format. Internal cells are buffered until allowed to transfer to an appropriate FSPP (92). Multipoint topology controllers (116) performs translations for internal switch flow control through interactions between the TSPPs (90), FSPPs (92), and the bandwidth arbiter (114). The bandwidth arbiter (114) performs appropriate bandwidth arbitration to allow internal cells to flow from TSPPs (90) to FSPPs (92) over the data crossbar (117).

Hierarchical resource management with maximum allowable allocation boundaries

Abstract: A system for managing resources such as buffers and bandwidth which are allocated to competing entities through two or more levels in a telecommunications network is disclosed. The system provides a tool to allocate resources for use by individual entities. Each entity may be assigned a Minimum -- Guaranteed variable and a Maximum -- Allowed variable. When an entity requests resources the system determines if the entity is using its respective minimum guaranteed resource allocation which is specified by the Minimum -- Guaranteed variable. If the entity is not using its respective minimum guaranteed resource allocation, the system allocates a resource unit to the requesting entity. The system also allows a requesting entity to use additional resource units above the resource allocation specified by the Minimum -- Guaranteed variable, provided such resource units are available. If the entity has reached its respective minimum guaranteed resource allocation, but has not reached the respective maximum allowed resource allocation specified by the Maximum -- Allowed variable and no intervening level is using its respective maximum allowed resource allocation, then a resource unit is allocated to the requesting entity.

Frame classification using classification keys

Abstract: An improved method and apparatus for recognizing, classifying and processing frames received at a frame processor in a computer network is disclosed. Following receipt of a frame at an input port of a frame processor, source and destination addresses are parsed from the frame. A plurality of lookup tables are provided in a memory, each of which contains a search field and a classification key field. Source or destination addresses are stored in the respective search fields along with other information associated with the frame and a compact classification key is stored in the corresponding classification key field. Searches are performed of the respective search fields within the respective lookup tables to determine whether a match exists between the each of the destination and source addresses and other information and the search field within the lookup tables. In the event the searches yield a match, a classification key associated with each respective address is retrieved. Classification keys corresponding to addresses thus retrieved are concatenated and the concatenated value is employed as the basis for a further search of the search field of another one of the lookup tables to identify a classification key which is employed to specify the manner of further processing of the received frame.

Allocated and dynamic switch flow control

Abstract: A method and apparatus are disclosed for eliminating cell loss in a network switch through the use of flow control of both allocated and dynamic bandwidth. When output buffers (28) in the switch become filled to a predetermined threshold level a feedback message (30) is provided to input buffers (26) to prevent transmission of cells from the input buffers to the output buffers. In order to provide connection and traffic type isolation the buffers are grouped into queues and flow control may be implemented on a per queue basis. The feedback message is a digital signal including an ACCEPT/REJECT message and a NO-OP/XOFF message. An XOFF message can be received while transmitting via allocated bandwith or dynamic bandwidth.