[工学]台湾宜兰大学互联网交换技术课程 02_Fast and Gigabit Ethernet_print.pdf

[工学]台湾宜兰大学互联网交换技术课程 02_Fast and Gigabit Ethernet_print.pdf

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[工学]台湾宜兰大学互联网交换技术课程 02_Fast and Gigabit Ethernet_print

Fast and Gigabit Ethernet Speaker: Dr. Whai-En Chen Assistant Professor Institute of Computer Science and Information Engineering National Ilan University (NIU) Email: wechen@niu.edu.tw The source is obtained from Prof. Nen-Fu Huang. Fast EthernetFast Ethernet andand Gigabit EthernetGigabit Ethernet © All rights reserved. No part of this publication and file may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanicalmechanical, photocopying photocopying, recording or otherwise recording or otherwise, without prior written without prior written permission of Professor Nen-Fu Huang (E-mail: nfhuang@cs.nthu.edu.tw). Fast EthernetFast Ethernet ThThe goall off ththe FFastt EthEthernett iis tto obtbtaiin an ordder off magnititudde increase in speed over 10BaseT Ethernet (IEEE 802.3) while retainingg the same wiringg syystems,, MAC method,, and frame formats. In IEEE 802.3, the longest distance between two stations is 2.5km, with a slot time of 51.2us (512 bits for 10Mbps). One way to increase the speed is to shorten the distance. In Hub architecture, the distance between station and Hub is at most 100m and the round-trip distance between two stations is 400m.400m. A faster speed can be used to transmit frames under CSMA/CD pprotocol while keeppingg the minimum frame size as 512 bits. In the standard, the speed is 100Mbps and denoted as 100BaseT. Fast Ethernet Characteristics 100 Mbps IEEEIEEE 802.3802.3 CSMA/CDCSMA/CD frameframe format.format. Medium TwistedTwisted pairpair -- UTPUTP, STPSTP Fiber CSMA/CDCSMA/CD PProttocoll, ddo nott supportt priioritity schheme. Do not support guaranteed delay service Frames collision Bandwidt

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