Cable Modems

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Cable Modems

• John Mickey

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Definition

• Cable stands for Cable TV Network
• Modem is modulator/demodulator
• Works more like a local area network interface
  than a modem
• CATV used for TV Networks but can be upgraded to
  allow signals to flow in both directions

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www.cable-modems.org
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Technical

• What is inside a Cable Modem?
• Tuner
• Demodulator
• Burst Modulator
• Media Access Control (MAC)
• Interface
• CPU

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Speed

• Telephone 56 Kbps
• ISDN 128 Kbps
• DSL 1.5-2 Mbps
• Cable 10 Mbps

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• Cable Companies
• ATT
• Cablevision
• Comcast
• Cox
• Time Warner

• Cable Modem Vendors
• 3Com
• Cisco
• Motorola
• New Media
• Many more

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Pricing

• ATT - 39.95/month for modem and service
• Cablevision - 29.95/month for service, modem is
  299
• Comcast - 39.95/month for modem and service
• Cox - 44.95/month for modem and service
• All companies had 150 installation

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Comparison Pricing

• USWest 2nd Phone Line - 23.72/month
• 33 Installation
• AOL, MSN, Prodigy, etc.
• Approximately 21/month
• DSL MegaBit from USWest - 29.95/month ISP

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Networking with a Cable Modem

• Physical structure
• Software setup
• Cost benefits
• Security

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Advantages

• Speed
• Always Connected
• Price
• Multiple Computers Connected At Once

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Disadvantages

• Speed can be effected by network usage
• Price
• Not available in all areas
• Cannot use AOL or other popular ISPs