Ethernet Standards

Question 1

100BASE-TX

Answer 1

• “Fast Ethernet”
  
  • Two pair
    
    • 100 Mbps
  • Category 5 minimum twisted pair copper wires
  • 100 meter max. distance

Question 2

1000BASE-T

Answer 2

• Gigabit Ethernet over Category 5
  ○ 4-pair balanced twisted-pair
  
  • Category 5
    ○ Cat. 5 is deprecated, so we use Cat 5e today
    ○ A shift to using all four pair
    ○ 100 meter maximum distance

Question 3

10GBASE-T

Answer 3

• 10 Gig Ethernet over copper
  ○ 4-pair balanced twisted-pair
  
  • Frequency use of 500 MHz
    ○ Well above the 125 MHz for gigabit Ethernet
  • Category 6
    ○ Unshielded: 55 meters
    ○ Shielded: 100 meters
  • Cat 6A (augmented)
    ○ Unshielded or Shielded: 100 meters

Question 4

40GBASE-T

Answer 4

• 40 gigabit per second Ethernet
  ○ 4 pair balanced twisted pair
  
  • Cat 8 cable
    ○ Up to 30 meters

Question 5

100BASE-FX

Answer 5

○ Pair of multimode fiber
○ Used the fiber as FDDI
○ Laser components
○ 400 meters (half-duplex), 2 kilometers (full-duplex)
100Mbps

Question 6

100BASE-SX

Answer 6

A less-expensive version of 100 megabit Ethernet over fiber
LED optics
300 meters maximum distance

Question 7

1000BASE-SX

Answer 7

○ Gigabit Ethernet using short wavelength laser
○ Usually over multi-mode fiber
○ 220 meters to 550 meters, depending on fiber type

Question 8

1000BASE-LX

Answer 8

○ Gigabit Ethernet using long wavelength laser
○ Multi-mode fiber to 550 meters
○ Single-mode fiber to 5 kilometers

Question 9

10GBASE-SR (Short Range)

Answer 9

○ Multimode fiber
○ 26 to 400 meters, depending on the fiber specification

Question 10

10GBASE-LR (Long Range)

Answer 10

○ Single-mode fiber
○ 10 kilometers maximum range

Question 11

WDM

Answer 11

• Wavelength-Division Multiplexing
  ○ Bidirectional communication over a single strand of fiber
  
  • Use different wavelengths for each carrier
    ○ Different “colors”
  • CWDM (Coarse Wavelength-Division Multiplexing)
    ○ 10GBASE-LX4 uses four separate 3.125 Gbit/sec carriers at four different wavelengths
  • DWDM (Dense Wavelength-Division Multiplexing)
    ○ Multiplex multiple OC carriers into a single fiber
    ○ Add 160 signals, increase to 1.6 Tbit/s