| IEEE标准容限内以太网转发时延的测试与分析 |
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| 引用本文： | 梁永生,张基宏,张乃通.IEEE标准容限内以太网转发时延的测试与分析[J].电子学报,2008,36(1):46-50. |
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| 作者姓名： | 梁永生 张基宏 张乃通 |
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| 作者单位： | 1. 深圳信息职业技术学院,广东深圳 518029;2. 哈尔滨工业大学通信技术研究所,黑龙江哈尔滨 150001 |
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| 基金项目： | 中国人民解放军总装备部重大预研项目，国家自然科学基金 |
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| 摘 要： | 本文在介绍以太网时延和以太网线速的基础上,对线速转发丢包问题进行分析.以测试交换机和Smartbits测试卡作为两个对接交换设备的模型,提出了时钟频偏是交换机转发时延的主要影响因素.推导了以太网交换机内部转发时延和频偏时延的计算公式,进行了以太网交换机一次、二次转发时延测试,理论计算和实验研究的结果验证了提出理论的正确性.
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| 关 键 词： | 以太网时延 线速 Smartbits测试卡 时钟频偏 转发时延 |
| 文章编号： | 0372-2112（2008）01-0046-05 |
| 收稿时间： | 2006-09-22 |
| 修稿时间： | 2007-08-10 |
Measurement and Analysis of Forwarding Delay in Ethernet Architecture Within Tolerances of the IEEE Specifications |
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| LIANG Yong-sheng,ZHANG Ji-hong,ZHANG Nai-tong.Measurement and Analysis of Forwarding Delay in Ethernet Architecture Within Tolerances of the IEEE Specifications[J].Acta Electronica Sinica,2008,36(1):46-50. |
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| Authors: | LIANG Yong-sheng ZHANG Ji-hong ZHANG Nai-tong |
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| Affiliation: | 1. Shenzhen Institute of Information Technology,Shenzhen,Guangdong 518029,China;2. Communication Research Center,Harbin Institute of Technology,Harbin,Heilongjiang 150001,China |
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| Abstract: | Based on ethernet delay and ethernet frame rate are briefly introduced,packet loss under the frame rate is analyzed in this paper.The model between a switch under tested (SUT) and a Smartbits card is presented and used for two interconnecting switches,this paper presents that clock frequency error (CFE) between a SUT and a Smartbits card is a leading factor of forwarding delay in an ethernet switch.The formulae of internal forwarding delay and forwarding delay caused by existing CFE are deduced.experimental measurement on primary Forwarding delay and secondary forwarding delay is implemented.Theoretical analysis and experimental study testify the accuracy of the above theory. |
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| Keywords: | Smartbits |
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