Asynchronous measurement of CDV in ATM networks using OAM cells
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| Natura: | Artículo científico |
| Lingua: | en |
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Universidad Nacional Autónoma de México
2003
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| _version_ | 1876451401594306560 |
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| author | Mohammed Ghanbari |
| author_facet | Mohammed Ghanbari |
| contents | Asynchronous measurement of CDV in ATM networks using OAM cells Mohammed Ghanbari Joaquín García Hernández Ingeniería Vol 1 No 3 October 2003 266 Variable Bit Rate (VBR) Quality of Service (QoS) The synchronisation between source and destination clocks at network nodes to a common reference time of day is important in order to achieve accurate measurements of cells delays in ATM networks. Otherwise, direct measurement of the cell transfer delay and cell delay variation using time-stamped OAM cells would be inaccurate. In this work, a method for the accurate measurement of cell delay variation using OAM cells, which does not rely on synchronised clocks at the measurement points is presented. This is achieved by assuming that each ATM switch has the capability to process and to modify the information contained in the OAM cells. The system presented here was modelled by means of a block-oriented network simulator (BONeS), which is a graphically-oriented, general-purpose simulation language for modelling and simulating communications networks, including ATM networks. The measurements of the cell delay variation were carried out on a VBR video source generated by a real MPEG-2 encoder with a fixed quantizer step size. The simulation results obtained show that measurements of the cumulative cell delay variation carried out without synchronised clocks at the measurement points were very closed to those obtained using synchronised clocks at the measurement points. 2003 artículo científico 1665-6423 https://www.redalyc.org/articulo.oa?id=47410308 en http://www.redalyc.org/revista.oa?id=474 Journal of Applied Research and Technology application/pdf Universidad Nacional Autónoma de México Journal of Applied Research and Technology (México) Num.3 Vol.1 |
| format | Artículo científico |
| id | redalyc_47410308 |
| institution | Redalyc |
| language | en |
| publishDate | 2003 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Asynchronous measurement of CDV in ATM networks using OAM cells Mohammed Ghanbari Ingeniería Vol 1 No 3 October 2003 266 Variable Bit Rate (VBR) Quality of Service (QoS) Asynchronous measurement of CDV in ATM networks using OAM cells Mohammed Ghanbari Joaquín García Hernández Ingeniería Vol 1 No 3 October 2003 266 Variable Bit Rate (VBR) Quality of Service (QoS) The synchronisation between source and destination clocks at network nodes to a common reference time of day is important in order to achieve accurate measurements of cells delays in ATM networks. Otherwise, direct measurement of the cell transfer delay and cell delay variation using time-stamped OAM cells would be inaccurate. In this work, a method for the accurate measurement of cell delay variation using OAM cells, which does not rely on synchronised clocks at the measurement points is presented. This is achieved by assuming that each ATM switch has the capability to process and to modify the information contained in the OAM cells. The system presented here was modelled by means of a block-oriented network simulator (BONeS), which is a graphically-oriented, general-purpose simulation language for modelling and simulating communications networks, including ATM networks. The measurements of the cell delay variation were carried out on a VBR video source generated by a real MPEG-2 encoder with a fixed quantizer step size. The simulation results obtained show that measurements of the cumulative cell delay variation carried out without synchronised clocks at the measurement points were very closed to those obtained using synchronised clocks at the measurement points. 2003 artículo científico 1665-6423 https://www.redalyc.org/articulo.oa?id=47410308 en http://www.redalyc.org/revista.oa?id=474 Journal of Applied Research and Technology application/pdf Universidad Nacional Autónoma de México Journal of Applied Research and Technology (México) Num.3 Vol.1 |
| title | Asynchronous measurement of CDV in ATM networks using OAM cells |
| topic | Ingeniería Vol 1 No 3 October 2003 266 Variable Bit Rate (VBR) Quality of Service (QoS) |
| url | https://www.redalyc.org/articulo.oa?id=47410308 |