Internet Connection

Question 1

Cable Modem

Answer 1

• Data on the “cable” network
  
  • DOCSIS ( Data Over Cable Service Interface Specification
• High-speed networking
  
  • 4Mbit/s - 250Mbit/s
• Multiple services
  
  • Data , voice

Question 2

Digital Subscriber Line

DSL

Answer 2

• ADSL (Asymmetric Digital Subscriber Line)
  
  • Uses telephone line
  • Download faster than Upload (Asymmetric)
  • 10,000 foot limitation from central office
  • 24 Mbit/s downstream / 3 Mbit/s upstream
• VDSL (Very High Bit Rate DSL)
  
  • 3Mbit/s - 100Mbit/s

Question 3

Dialup

Answer 3

-Network with telephone lines

• 56Kbit/s modem
  
  • Compression up to 320Kbit/s
• Relatively slow throughput
• Legacy systems , net utility

Question 4

Fiber

Answer 4

• Fiber optics to the home
  
  • High speed networking
• Converged services
  
  • Voice , data , video
• Enhanced features
  
  • 1 Gbit/s Internet Access
  • 1 Terabyte of cloud storage
  • 2 Terabyte DVR

Question 5

Satellite

Answer 5

-Communication to a satellite

• Higher cost
  
  • 15Mbit/s down / 2Mbit/s up
  • Remote sites
• High latency
• High frequency - 2Ghz

Question 6

Integrated Service Digital Network

ISDN

Answer 6

-Integrated Services Digital Network

• BRI - Basic Rate Interface (2B + D)
  
  • Two 64Kbit/s bearer (B) channels
  • One 16Kbit/s signaling (D) channel
• PRI - Primary Rate Interface
  
  • Delivered over a T1 or E1

-Common used connectivity from PSTN to large phone system

Question 7

Cellular Network

Answer 7

• Mobile devices
• Separate land into “cells”
• Tethering
  
  • Turn phone into wireless router
• Mobile hotspot
  
  • Standalone devices
  • Use phone for other things

Question 8

Line of Sight Services

Answer 8

• Line of sight
  
  • High frequencies

-Common in Metropolitan areas

• Option for non-line of sight
  
  • Lower frequencies

-WiMAX networking (Worldwide Interoperability for Microwave access) Wireless high-speed internet