【正文】 PLASTIC TAPE COVERED WITH FERROUS OXIDE (2400 feet per spool) ? RECORD GROUPS: BLOCKING FACTOR (., 10 records per block) ? GROUPS SEPARATED BY INTERBLOCK GAP ? RECORDS READ BLOCK AT A TIME * HEADER IBG BLOCK 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 通訊網(wǎng)絡(luò)的組成 “ Any one in the world could be your customer。 A building。 media Copper wires, Coaxial cable, Fiber optic cables, microwave’s system, Communications satellites. 4. Computers Mainframe, Host puters Miniputer Front end processors Microputer Network server 5. Telecontrol software Monitors (Mainframe) Network operating systems (Micro) Communication package (Micro) 對絞線 Twisted wire 同軸電纜 Coaxial cable 光纜 Fiber Optic 陸基微波 Land based Microwave 通訊衛(wèi)星 Satellite 蜂窩網(wǎng) Cellular radio 無線 LAN Wireless LAN 網(wǎng)絡(luò)的類型 LANs Local Area Networks 有限空間