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Media and Medium

Media and Medium. Jason Smith August 9, 2014. Transmission Media. Coaxial Cable Twisted Pair Copper Cable Fiber-optic Cable Wireless. Coaxial Cable. Two types ThinNet (10Base2) 10 Mbps, 30 nodes per segment, max 180 meters LAN ThickNet (10Base5)

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Media and Medium

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  1. Media and Medium Jason Smith August 9, 2014

  2. Transmission Media • Coaxial Cable • Twisted Pair Copper Cable • Fiber-optic Cable • Wireless

  3. Coaxial Cable • Two types • ThinNet (10Base2) • 10 Mbps, 30 nodes per segment, max 180 meters • LAN • ThickNet (10Base5) • 10 Mbps, 100 nodes per segment, max 500 meters • Backbone • Insecure • Coax is easy to splice

  4. Twisted Pair Copper Cable • Copper wire • Twist reduces EMI • Classified by transmission rates • Cat3, Cat5, Cat5e, Cat6

  5. Fiber-Optic Cable • Glass core with plastic shielding • Small, light, fragile, and expensive • Very fast transmission rate • Can transmit data very far • Immune to interference • Hard to splice

  6. Wireless • Microwave, radio and infrared

  7. Security Concerns • Easy to insert a node or splice into network • Most attacks involve eavesdropping or sniffing • Physical security • War driving

  8. Storage Media • Magnetic Storage • Optical Media • Solid-State Storage Media

  9. Magnetic Storage • Floppy Disks • 8”, 5.25” • 3.5” • Double Density – 800KB • High Density – 1.4MB • Zip Disks • 100MB, 250MB, 750MB • Other Disks • Jazz, Pocket Zip, Super Disk,Tape Backup

  10. Around $1/GB Three interfaces SCSI Introduced in early 1980’s Very fast, reliable, expensive Up to 320MB/s Up to 16 devices IDE / ATA Cheap, common, easy to setup Somewhat unreliable Serial ATA Introduced in 2002 150MB/s Hot-plugging capability Serial Attached SCSI Magnetic Storage – Hard Drives

  11. Optical Media - CD • CD-ROM, CD-R, CD-RW • Typically store 700MB • 1.8GB/$

  12. Optical Media - DVD • Digital Versatile Disc • Typically store 4 to 17GB • Standards • DVD, DVD-RAM, DVD-R, DVD-R/W, DVD+R/W • Non-standards • DVD-VCD, DVD-SVCD,DVD-MP3

  13. Future Standards DVD+RW DL 8.5GB DVD+RW Alliance Available now DVD HD 20+GB Toshiba and NEC Available in 2005 Blu-ray 27GB on single sided, single layer disc blue-violet laser Panasonic, Pioneer, Sharp, Samsung, Sony Optical Media - DVD

  14. Solid-State Storage Media • No moving parts • Slow/fast • Very small • Generally used in cameras, PDAs, etc. • Several types • CompactFlash (1GB) • Memory Stick (512MB) • Secure Digital (512MB) • Smart Media (128MB)

  15. Security Concerns

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