Source: http://www.google.com/patents/US6256316?dq=4393663
Timestamp: 2016-12-07 22:18:57
Document Index: 452254837

Matched Legal Cases: ['art 2', 'art 2', 'art 2', 'art 2', 'art 2', 'art 2', 'art 2', 'art 2', 'art 1', 'art 1', 'art 1', 'art 1', 'art 2', 'art 2', 'art 1', 'art 1']

Patent US6256316 - Communication method in centralized supervisory system - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsIn a centralized supervisory system having a plurality of individual supervisory devices which assembles control signal cells and main signal cells into frames and send the frames, and a centralized supervisory device which collects the supervisory information included in the control signal cells from...http://www.google.com/patents/US6256316?utm_source=gb-gplus-sharePatent US6256316 - Communication method in centralized supervisory systemAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS6256316 B1Publication typeGrantApplication numberUS 09/111,646Publication dateJul 3, 2001Filing dateJul 8, 1998Priority dateFeb 5, 1998Fee statusLapsedPublication number09111646, 111646, US 6256316 B1, US 6256316B1, US-B1-6256316, US6256316 B1, US6256316B1InventorsKojun MitaniOriginal AssigneeFujitsu LimitedExport CitationBiBTeX, EndNote, RefManPatent Citations (9), Classifications (14), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetCommunication method in centralized supervisory system
US 6256316 B1Abstract
What is claimed is: 1. A communication method in a centralized supervisory system having a plurality of individual supervisory devices which supervise a variety of performance for each connection identifier of a main signal and create supervisory information and which assemble control signal cells including the supervisory information and main signal cells into frames, which are then sent to transmission lines, and a centralized supervisory device which collects the supervisory information included in the control signal cells from the individual supervisory devices and sends the main signal cells to a network, said communication method comprising the steps of:
determining, for each of the individual supervisory devices, maximum band for control signal on the basis of length of data to be transmitted; arranging, in each of the individual supervisory devices, a given number of control signal cells in each frame so that the control signals are transmitted within the maximum band; and sending, via transmission line, the frames to the centralized supervisory device from each individual supervisory device. 2. The communication method in the centralized supervisory system as claimed in claim 1, further comprising the steps of:
sequentially sending a polling cell for collecting the supervisory information to the individual supervisory devices; sending, from each of the individual supervisory devices in response to the polling cell, the length of data to be transmitted to the centralized supervisory device; and determining, in the centralized supervisory device, the maximum band for the control signal for each of the individual supervisory device on the basis of the length of data and notifying the maximum band thus determined to the individual supervisory device, wherein each of the individual supervisory devices sends the control signal cells to the centralized supervisory device within the maximum band. 3. The communication method in the centralized supervisory system as claimed in claim 2, wherein the step of determining the maximum band comprises the steps of:
setting, for each of the individual supervisory devices, a standard band and a standard transfer time for the control signals; computing a transfer time in the standard band by dividing the corresponding length of data by the standard band; comparing the transfer time thus computed with the standard transfer time; computing the sum of the standard band and α (>0); and setting the sum as the maximum band for the control signals if the transfer time computed is longer than the standard transfer time. 4. The communication method in the centralized supervisory system as claimed in claim 3, wherein the step of determining the maximum band comprises a step of setting, the standard band as the maximum band for the control signals if the transfer time computed is equal to or shorter than the standard transfer time.
supervising, in each of the individual supervisory devices, an increase in the number of main signal cells; and reducing the maximum band for the control signals to the standard band and increasing the maximum band for the main signal if the number of main signal cells is increased while the control transfer cells are being transferred at the maximum band determined.
FIG. 18 schematically shows a communication part of the centralized supervisory device 2. The communication part shown in FIG. 18 is made up of a supervisory information memory 2 a, a processor (CPU) 2 b, a frame assemble/cell separate part 2 c, and a cell assemble/disassemble part 2 d. The supervisory information memory 2 a stores the supervisory information collected from the individual supervisory devices 1 1-1 n. The frame assemble/cell separate part 2 c assembles the cells (the main signal cells and control signal cells) into a frame which conforms with, for example, the SONET OC3 level, and sends the OC3 frame to a transmission line (optical fiber) TL. Further, the frame assemble/cell separate part 2 c separates the OC3 frame received over the transmission line TL into the main and control signal cells. The cell assemble/disassemble part 2 d assembles a control signal from the CPU 2 b into control signal cells, and disassembles control signal cells supplied from the frame assemble/cell separate part 2 c into a control signal, which is then input to the CPU 2 b. FIG. 19 is a diagram of a supervisory sequence in which the centralized supervisory device 2 collects the supervisory information from the individual supervisory devices 1 1-1 n. The CPU 2 b of the centralized supervisory device 2 sends a polling cell to the individual supervisory device 1 1 via the cell assemble/disassemble part 2 d and the frame assemble/cell separate part 2 c. The frame assemble/cell separate part 1 c of the individual supervisory device 1 1 supplies the received polling cell to the CPU 1 b via the cell assemble/disassemble part 1 d. The CPU 1 b checks whether there is a change in the supervisory information between the previous polling and the current polling. If it is judged that there is no change, the CPU 1 b sends an ACK cell to the centralized supervisory device 2 via the cell assemble/disassemble part 1 d and the frame assemble/cell separate part 1 c. The CPU 2 b of the centralized supervisory device 2 receives the ACK signal via the frame assemble/cell separate part 2 c and the cell assemble/disassemble part 2 d, and thus recognizes that there is no change in the supervisory information on the individual supervisory device 1 1. Then, the CPU 2 b sends the polling cell to the next individual supervisory device 1 2. If there is a change in the supervisory information on the individual supervisory device 1 2, the CPU 1 b thereof assembles changed supervisory information (change data) into the cell, which is then sent to the centralized supervisory device 2. Then, the centralized supervisory device 2 extracts the change data from the received cell, and revises the old data in the supervisory information memory 2 a by using the change data. The frame assemble/cell separate part 1 c of the individual supervisory device 1 2 inserts the control signal cells (supervisory information cells) into the main signal cells at a fixed rate. Then, the main signal cells are framed and sent to the transmission line. That is, the frame assemble/cell separate part 1 c maps a number of control signal cells corresponding to the fixed rate in the payload PL of the SONET OC3, and sends the mapped control signal cells to the transmission line. The CPU 2 b of the centralized supervisory device 2 receives all change data, and thereafter sends the polling cell to the next individual supervisory device 1 3. Then, the supervisory information is collected and managed in the same sequence as described above.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS5586267 *Jun 7, 1995Dec 17, 1996Bay Networks, Inc.Apparatus for providing for automatic topology discovery in an ATM network or the likeUS5953338 *Dec 13, 1996Sep 14, 1999Northern Telecom LimitedDynamic control processes and systems for asynchronous transfer mode networksUS6014382 *Apr 2, 1997Jan 11, 2000Hitachi, Ltd.ATM switching system including a switching control portion for distributing call set-up requirement signalsUS6021113 *Oct 29, 1997Feb 1, 2000Lucent Technologies Inc.Distributed precomputation of network signal paths with table-based link capacity controlUS6026091 *Jul 27, 1998Feb 15, 2000Sprint Communications Co. L.P.ATM gateway systemUS6097722 *Dec 13, 1996Aug 1, 2000Nortel Networks CorporationBandwidth management processes and systems for asynchronous transfer mode networks using variable virtual pathsJPH0498938A Title not availableJPH04288744A Title not availableJPH06169316A Title not available* Cited by examinerClassifications U.S. Classification370/422, 370/410, 370/398International ClassificationH04L12/815, H04L12/70, H04L12/811, H04L12/863, H04L12/24, H04Q3/00Cooperative ClassificationH04L12/5601, H04L41/044, H04L2012/5626European ClassificationH04L41/04B, H04L12/56ALegal EventsDateCodeEventDescriptionJul 8, 1998ASAssignmentOwner name: FUJITSU LIMITED, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MITANI, KOJUN;REEL/FRAME:009317/0911Effective date: 19980624Mar 5, 1999ASAssignmentOwner name: FUJITSU LIMITED, JAPANFree format text: CORRECTIVE ASSIGNMENT TO CORRECT DOCKET NUMBER PREVIOUSLY RECORDED ON REEL 9317, FRAME 0911;ASSIGNOR:MITANI, KOJUN;REEL/FRAME:009795/0674Effective date: 19980624Jan 19, 2005REMIMaintenance fee reminder mailedJan 26, 2005REMIMaintenance fee reminder mailedJul 5, 2005LAPSLapse for failure to pay maintenance feesAug 30, 2005FPExpired due to failure to pay maintenance feeEffective date: 20050703RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services