管理信息系统计算机硬件软件(编辑修改稿)

管理信息系统计算机硬件软件(编辑修改稿)内容摘要：

1 BLOCK 2 BLOCK 3 MAGNETIC TAPE • ENCLOSED FERROUS OXIDE TAPE • USED PERIODICALLY TO BACK UP RECORDS • INEXPENSIVE • STORED IN SAFE LOCATION • CAN BE REUSED MAGNETIC CARTRIDGE • CDROM: 500660 MEGABYTES –LAND: FLAT PARTS OF DISK SURFACE REFLECTS LIGHT –PITS: SMALL SCRATCH ON SURFACE SCATTERS LIGHT • WORM: WRITE ONCE / READ MANY • ERASABLE OPTICAL STORAGE (EOS) DISKS * OPTICAL STORAGE MULTIMEDIA WORKSTATION CDROM HEADPHONES STEREO SPEAKERS LEFT, RIGHT, WOOFER SUPER VGA MONITOR VIDEO BOARD + EXTRA MEMORY STEREO SOUND BOARD (32 BIT: WAV, MIDI, CD) AT LEAST 16 MG RAM (32 MG MUCH BETTER) JOYSTICK HARD DRIVE: 1 GIG OR MORE, JAZ DRIVE 通讯网络的组成 “ Any one in the world could be your customer。 any one in the world could be your petitor.” 网络模型 Network Model: A munication work is any arrangement where a sender transmits a message to a receiver over a channel consisting of some type of medium 第 6章 通信与网络 图 6. 1 以单计算机为中心的远程联机系统 图 6. 2 存储转发的计算机网络 组织的数据库通过M o d e m 远程访问中央服务器( 总部）局域网A局域网B局域网C局域网E局域网D图 6. 4 某人寿保险公司的局域网和广域网 图 点到点式网络的拓扑结构 (a)星 型结构 (b)环 型结构 (c)树 型结构图 6. 6 广播式网络拓扑结构 卫星(a)总线型 (b)卫星和无线电式图 同轴电缆结构图 图 6. 8 光纤传输 1 2 3 4 5 End user Tele Tele Tele puter processors Channels processors amp。 Media Computer 2 Tele softw are 五种基本部件 1. Terminals 2. Tele processors Modem, multiplexes amp。 frontend processors, Digital to Analog or back, Code amp。 decode data, Control the accuracy amp。 efficienc。