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Blue + OrangeTelephone
Green + BrownEthernet Jack

June 20, 2025, Friday Rewired the "Main" CAT5 cable in the Shop:

  • Removed the RJ11 wallplate jack using Blue and Orange pairs
  • Wired an RJ25 telephone snap-in module using Blue and Orange pairs
  • Wired an RJ45 Ethernet snap-in module using Green and Brown pairs
  • Installed modules in a 2-place snap-in wall plate and mounted the wall plate

Telephone jack with 4 conductors on RJ25 (6P6C):

PINFUNCTIONCOLOROLD-STYLE
1(n/c)  
2Line2 TipOrange/WhiteBlack
3Line1 RingBlueRed
4Line1 TipBlue/WhiteGreen
5Line2 RingOrangeYellow
6(n/c)  

Ethernet jack with 4 conductors on RJ45 (which limits speeds to FastEthernet 100Mbps; 8 conductors needed for Gigabit Ethernet). Because the Orange pair is already committed to the USOC phone standard, the Brown pair is used in place of the Orange:

PINFUNCTIONCOLOR
1TX+Green/White
2TX–Green
3RX+Brown/White
4(n/c) 
5(n/c) 
6RX–Brown
7(n/c) 
8(n/c)