Wireless Interfaces

Question 1

Infrared

Answer 1

• Standards from the IRDA (Infrared Data Association)
• 4 Mbit/s speed / Line of sight
• 1 Meter distance limitation
• Laptop, phone, camera, etc.

Question 2

Near Field Communication

NFC

Answer 2

• 106 Kbit/s, 212 Kbit/s & 424 Kbit/s
• Range of 10cm or less
• Movile devices, payment devices (Apple/Samsung Pay

Question 3

Bluetooth Radio

Answer 3

• Categorized in classes
• Class 1 - Industrial use - 100 meters
• Class 2 - Used in Mobile devices - 10 meters
• Class 3 - Short range use - 1 meter

Question 4

Bluetooth Versions

Answer 4

-Version 1.2 (1995) Fast connection & Recovery

• Version 2.0 + EDR (& 2.1 EDR)
  
  • Enhanced Data rate
• Version 3.0 + HS (High Speed)
  
  • Bluetooth used for negotions &Establishments
  • 802.11 used for data transfer

-Version 4.0 = Included low-power specification

Question 5

Bluetooth Speeds

Answer 5

• Version 1.2 - 1 Mbit/s
• Version 2.0 EDR - 3 Mbit/s
• Version 3.0 + High Speed - 24 Mbit/s
• Version 4.0 - 24 Mbit/s

Question 6

802.11 Networking

Answer 6

• 802.11a - 5Ghz - 54 Mbit/s - 1 Stream - 120 Meters
• 802.11b - 2.4Ghz - 11 Mbit/s - 1 Stream - 140 Meters
• 802.11g - 2.4Ghz - 54 Mbit/s - 1 Stream - 140 meters
• 802.11n - 5 or 2.4Ghz - 150 Mbit/s - 4 Streams - 250 meters
• 802.11ac - 5Ghz - 866.7 Mbits - 8 Streams - 250 meters