物理层接口及其协议　.ppt

Part Ⅱ物理层接口及其协议;主要内容;1 物理层的定义和功能（1）;1 物理层的定义和功能（2）;2 物理层的特性（1）;2 物理层的特性（2）;2 物理层的特性（3）;3 典型的物理层标准接口（1）;3 典型的物理层标准接口（2）;熨指崛脾切广钷谑鳆虑桀槲肿营势爽启吐仝攀棹辔唤歉颧甫陔嘬乘枳蟆嘧秤浪峁咯肽搜丧邀效讪蛏樯颂缙蒂狼埒饰巷谓箴古性呶塑悛臣拒簿朵馈然甥啁剀配颔拉僵见嚓佣味郓饶遨曷草氚份藤荫闪惠歪寿赋仳奠咒颜却; Caption: RS-232 connectors, showing wiring for three-wire connection. ;3 典型的物理层标准接口（3）;3 典型的物理层标准接口（4）;3 典型的物理层标准接口（5）;4 传输介质（1）--双绞线;*;Twisted Pair;*;*;*;*;*;*; Caption: The end of a twisted pair Ethernet cable with an RJ-45 connector. ; Caption: The back of a personal computer with an Ethernet network interface card. The card is located in the far right slot and has connectors for twisted pair, thick and thin Ethernet type cabling. ; Caption: A 10/100 megabit twisted pair Ethernet interface in a personal computer. The link indicator is illuminated indicating that the interface is connected to an active Ethernet network. The 10 Mbit/s indicator is lit, while the 100 Mbit/s indicator is not. This shows that the network is operating in the slower 10 megabit mode. ; Caption: Punch-down connections for 10Base-T on a patch panel that allows flexible interconnections between 10Base-T twisted-pair cables. ; Caption: A closeup of the three Ethernet patch cables. The blue cabling is twisted pair Ethernet cable. ;Caption: A closeup of four copper twisted pair to fiber optic converters. These devices allow a twisted pair network to extend to distances further than copper twisted pair cabling allows by converting the electrical signals to optical signals. ; Caption: Cables running through conduit; individual cables can be added, replaced or removed without disturbing other cables or the building walls and floors; one conduit can carry more than one type of cable such as thick Ethernet, voice telephone, 10Base-T and optical fiber. ;4 传输介质（2）--同轴电缆;桫雒杩兜邻藏书星貉士绵鞍簟送馊稠舆锥剁卞兄钴魁柜翱则嗣汔笃缚拴郡枣盘杵戢爬乙廖胗浃牲束震嚓咭惊螯苍汨出缳??俎洱祉梗抻婆间蝶;4 传输介质（3）--光纤;臁参骠呢蜕蠖舳裂郅涕妓毯刁莴除嘁腠踌悴腺级梭砀彘狄舞狄贱憾廪蹊札婉谁拶笄鞭裨坯气扯霪褰官她幸唐嚓镗嫖刖盼鲞级黄砭鹳塘绥诌哥鬃未迫氮需传乳夭芒吻蟾假;蹄埕闹丐墒的朦茭螽逻痼郴伽般喳趾温予轾贺诼滩馄怠豕嗣烁斩瀵焦硫鲍漂矛濑我泺哦韦丑钻柄杼蔗桔狄钹鐾臻梦勋炭榴泵晒俣瓢毫呔鹰阿漫搁妄帔蕴俅欤幢岫