Communication Media(channel) Means by which data are transmitted · Cable media (1) wisted pair wire双绞线(电话线 Copper wires,( Coaxial Cable同轴电维(有 线电视),(4) Fiber Optics 双绞线 怒签
HUANG Lihua, Fudan University Communication Media (channel) • Means by which data are transmitted. • Cable Media: – (1)Twisted Pair Wire双绞线（电话线）;(2) Copper Wires, (3)Coaxial Cable同轴电缆（有 线电视）, (4) Fiber Optics * 双绞线 PVC外壳
Communication Media(channel) Wireless media (1)Microwave;(2)Satellite; (3)Global Positioning Systems;(4)Radio; (5) Infrared; (6) Cellular Radio Technology (7) Mobile Computing 绝缘层 外导线 铺铺 金属防层 内导层
HUANG Lihua, Fudan University • Wireless Media: – (1) Microwave; (2) Satellite; (3) Global Positioning Systems; (4) Radio; (5) Infrared; (6) Cellular Radio Technology; (7) Mobile Computing. * 外壳 绝缘层 金属防护层 导体 绝缘层 内导层 外导线 外壳 Communication Media (channel)
FIBER OPTICS光纤 Made of thousands of super clear glass strands Fast, light, durable trillions of bits per second, full duplex,以光脉冲 形式在电缆中传输 EXPENSIVE. HARDER TO INSTALL OFTEN USED AS BACKBONE OF NETWORKS PHOTO SIGNAL LASER CABLE DETECTOR SIGNAL
HUANG Lihua, Fudan University • Made of thousands of super clear glass strands • Fast, light, durable • trillions of bits per second, full duplex, 以光脉冲 形式在电缆中传输 • EXPENSIVE, HARDER TO INSTALL • OFTEN USED AS BACKBONE OF NETWORKS * FIBER OPTICS光纤 SIGNAL LASER CABLE PHOTO DETECTOR SIGNAL
FIBER OPTICS BACKBONE主干网 Fiber optics cable carries light signals to distribution nodes, which use copper wires to user DENSE WAVE DIVISION MULTIPLEXING (DWDM)高密度分波多路转接器 Next-generation, uses many colors,(up to 160)each a channel, increases capacity of a fiber to 6. 4 terabits per second DWDM使用不同颜色的光缆或不同波长在同以时间 及同一光缆上传送不同的数据流来提高传送容量 DWDM每条光缆包含了最多160个波长,每秒最多 可以在单一光缆上传送64 terabits
HUANG Lihua, Fudan University FIBER OPTICS • BACKBONE主干网 – Fiber optics cable carries light signals to distribution nodes, which use copper wires to user • DENSE WAVE DIVISION MULTIPLEXING (DWDM)高密度分波多路转接器 – Next-generation, uses many colors, (up to 160) each a channel, increases capacity of a fiber to 6.4 terabits per second – DWDM使用不同颜色的光缆或不同波长在同以时间 及同一光缆上传送不同的数据流来提高传送容量。 – DWDM每条光缆包含了最多160个波长，每秒最多 可以在单一光缆上传送6.4 terabits。 *
Wireless/Transmission (egahert。赫 105-108 AM Radio: Short Wave. FM: VHF-TV 108-1010:UHF-TV, Cellular phones(移动电话, 天线与基地台,8英里)), RAM Mobile,Data, Cordless phone, Paging(呼叫系统), Narrow Band PCs Industrial 1010-1012: Radar Microwave 1013-1014: Infra red. Remote Control. wireless 1015-1016: Visible Light; Fiber Optics 1018-1022: X-Ray, Gamma, Cosmic, Personal Communication Services(PCS)(数字移动电 直辖疼sf能智能终端、PDA)
HUANG Lihua, Fudan University Wireless Transmission (Megahertz兆赫) • 105 - 108: AM Radio; Short Wave; FM; VHF-TV • 108 - 1010: UHF-TV, Cellular Phones（移动电话， 天线与基地台，8英里））, RAM Mobile, Data, Cordless Phone, Paging（呼叫系统）, Narrow Band PCS, Industrial • 1010 - 1012: Radar, Microwave • 1013 - 1014: Infra Red, Remote Control, Wireless • 1015 - 1016: Visible Light; Fiber Optics • 1018 - 1022: X-Ray, Gamma, Cosmic, Personal Communication Services (PCS）（数字移动电 直线波、微波中继站 话，smart phone智能终端、PDA)