Cable Characteristics

Question 1

Fiber Communications

Answer 1

• Transmissions by light
  
  • Visible spectrum
• No RF signal
  
  • Very difficult to monitor or tap
• Signal slow to degrade
• Immune to radio or electrical interference

Question 2

Multimode Fiber

2km distance

Answer 2

• Short range communication
  
  • Up to 2km
• Inexpensive light souce
  
  • LED

Question 3

Singlemode Fiber

100km distance

Answer 3

• Long - Range communication
  
  • Up to 100km without processing
• Expensive lightsource
  
  • Laser

Question 4

Twisted Pair Copper Cabling

Answer 4

• Balance pair Operation
  
  • Two wires with equal & opposite signals
  • Transmit + , Transmit - / Receive + , Receive -

Twist is the secret

 - Keeps single wire away from interference
 - Opposite signals are compared at the end

-Pairs in the same cable have different twist rates

Question 5

Unshielded Twisted Pair

UTP

Answer 5

• Unshielded Twisted Pair (UTP)
• No additional shielding
• The most common twisted pair cabling

Question 6

Shielded Twisted Pair

STP

Answer 6

• Shielded Twisted Pair (STP)
• Additional shielding protects against interference
• Requires the use of an electrical ground

Question 7

Plenum Space

Answer 7

-Space between drop ceiling & the actual ceiling of the building

Question 8

Plenum -Rated Cable

Answer 8

• Cable jacket
  
  • Fluorinated Ethylene Polymer (FEP) with low-smoke made from Polyvinyl Chloride (PVC)

-Plenum rated cable not as flexible

Question 9

Coaxial Cable

Answer 9

-Two or more forms share a common axis

• RG-6 used in television / digital cable
  
  • And high speed internet over cable
• RG-59 used as a patch
  
  • Not designed for long distances