Transmission Media

• general terminology
• 4 primary types of transmission media discussed
  • Twisted Pair
  • Coaxial
  • Fiber Optics
  • Wireless

Terms:

• EMI – Electro magnetic Interference
• Crosstalk – jumping of data from one line to the next
• Attenuation – loss of signal strength over a distance

Twisted Pair

• shielded / unshielded
• colors of wires
• cost effective
• 100 meters / 326 feet
• not very secure
• emi occurs in unshielded
• Cat 3, Cat 5, Cat 5e, Cat 6 transmission speeds
• RJ45 jack

Coaxial

• Thinnet / Thicknet
• Thinnet – 185 meters
• Thicknet – 500 meters

Fiber Optic

• how fiber is put together
• how fiber works
• SMF / MMF
• distances (SMF = 60 miles / MMF 300 meters)
• highly secure
• no emi / crosstalk
• half-duplex

Wireless

• 802.11 general info
• adhoc vs infrustructure modes
• 802.11 speeds (b, g, n, ac)
  • b= 11Mbps 2.4 GHz
  • g= 54Mbps  2.4GHz
  • n= 65 to 600Mbps  2.4GHz or 5GHz
  • ac = 78Mbps to 3.2Gbps   5GHz

Cable Plant Management

• hardware involved
• layout (work area, horizontal wiring, etc)
• why we have cable management