3.1 - 568A and 568B Colors

Question 1

Structured cabling standards

Answer 1

• International ISO/IEC 11801 cabling standards
  – Defines classes of networking standards
• Telecommunications Industry Association (TIA)
  – Standards, market analysis, trade shows,
  government affairs, etc.
  – ANSI/TIA-568: Commercial Building
  Telecommunications Cabling Standard
  – http://www.tiaonline.org
• Commonly referenced for pin and pair assignments of
  eight-conductor 100-ohm balanced twisted pair cabling
  – T568A and T568B

Question 2

T568A and T568B termination

Answer 2

• Pin assignments from T568-B standard
  – Eight conductor 100-ohm balanced twisted-pair cabling
• T568A and T568B are different pin assignments for
  8P8C connectors
  – Assigns the T568A pin-out to horizontal cabling
• Many organizations traditionally use 568B
  – Difficult to change in mid-stream
• You can’t terminate one side of the cable with
  568A and the other with 568B
  – This has never been the definition of a
  Gigabit Ethernet crossover cable

Question 3

T568A & T568B Colors Image

Answer 3