《信息工程网络双语10.pptVIP

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2016-12-28 发布于北京
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《信息工程网络双语10.ppt

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Ring Repeater States （a）Listen state 侦听状态（b）Transmit state 传输状态（c）Bypass state 旁路状态 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. (a) Listen State Functions Scan passing bit stream for patterns Address of attached station Token permission to transmit Copy incoming bit and send to attached station Whilst forwarding each bit Modify bit as it passes e.g. to indicate a packet has been copied (ACK) (b) Transmit State Functions Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. (c) Bypass State Signals propagate past repeater with no delay (other than propagation delay) Partial solution to reliability problem (see later) Improved performance Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 802.5 MAC Protocol Small frame (token) circulates when idle Station waits for token Changes one bit in token and append rest of data frame Frame makes round trip and is absorbed by transmitting station Station then inserts new token when transmission has finished and leading edge of returning frame arrives当帧已经传输完并且被传输的帧的前端返回到该站点。 Under light loads, some inefficiency Under heavy loads, round robin Advantage -------efficient and fair Disadvantage ------Token maintenance Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Token: a small frame Token Ring MAC Frame Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. William StallingsData and Computer Communications7th Edition Chapter 16 High Speed LANs Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Chapter 16 High-speed LANs 16.1 The emergence of high-speed LANs 16.2 Ethernet 16.3 Token ring 16.4 Fibre cha