Consult everybody bosses, a problem about twisted-pair:
Does the last sentence of this passage mean 5 below is simplex communication? So on both ends of a piece of string, the end of 1, 2 is green and white, green, and whether the other end must be 1, 2 for white, orange orange?

International commonly used making twisted-pair standards including EIA/TIA 568 a and EIA/TIA 568 b two kinds,
EIA/TIA 568 a line of sequence definition of green and white, green, orange, white, blue, blue, white, orange, brown, white, brown,
The EIA/TIA 568 b line sequence definition of orange and white, orange, green and white, blue, blue and white, green, brown, white, brown,
100 base - T4RJ - 45 provisions to twisted-pair are as follows:
Used to send 1, 2, 3, 6 for receiving, 4, 5 for voice, 7, 8 is bi-directional line,