Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.

UTP Cat 5 Wiring): Whats the difference between 568A and 568B?

April 26, 2017cat difference UTP wiring

0

10 Posted

UTP Cat 5 Wiring): Whats the difference between 568A and 568B?

1 Answer

0

10 Posted

TIA/EIA-568A and -568B are two standards for connecting Category 3 and Category 5 wire to connectors. Both are appropriate for high speed data, though 568B is somewhat more common for installed wiring and 568A is more common in jumpers. There is no performance advantage either way. The only real difference between the two is the order in which the pairs are used (orange and green). Hold a cable as if to plug it into a wall jack, the locking tab down (contacts facing you). The contacts are numbered 1-8 from left to right. Here’s what you will see: EIA/TIA-568A: Pin 1: White/Green Pin 2: Green/White (or just plain Green) Pin 3: White/Orange Pin 4: Blue/White (or just plain Blue) Pin 5: White/Blue Pin 6: Orange/White (or just plain Orange) Pin 7: White/Brown Pin 8: Brown/White (or just plain Brown) EIA/TIA-568B: Pin 1: White/Orange Pin 2: Orange/White (or just plain Orange) Pin 3: White/Green Pin 4: Blue/White (or just plain Blue) Pin 5: White/Blue Pin 6: Green/White (or just plain Green)