Frunple
Active Member
Lou, "they" are right and you are right except for the part that you are wrong...
Yes, the conductors are the same but there is a difference in the two standards and the twists are correct except they are wrong about the "A" and "B". How could "A" be newer than "B"?? Common sense says A comes before B. So a quick history...
"A" was always the standard, then they came out with a TDR and you can actually see the signal and what crimps and crossovers etc actually do to the signal. That created the "B". The most important aspect of cat5 is the twists. So you have to do anything you can to maintain those twists as far as you can. If you open up a cat5 and lay out the wires so they form an X or a cross, you will see the orange pair will be across from the brown pair and the blue across from the green. This is the reason "B" was adopted. When you form the wires to insert into a RJ45 using the "A" standard you will have to cross the green pair over at least one other pair. Using the "B", you will not have to cross any other pair so none of the wires are crimped and the twists are maintained the farthest they can be.
Of course this is all moot with cat6 cable because now the pairs do not lay the same depending on the manufacturer so none of it matters.
Yes, the conductors are the same but there is a difference in the two standards and the twists are correct except they are wrong about the "A" and "B". How could "A" be newer than "B"?? Common sense says A comes before B. So a quick history...
"A" was always the standard, then they came out with a TDR and you can actually see the signal and what crimps and crossovers etc actually do to the signal. That created the "B". The most important aspect of cat5 is the twists. So you have to do anything you can to maintain those twists as far as you can. If you open up a cat5 and lay out the wires so they form an X or a cross, you will see the orange pair will be across from the brown pair and the blue across from the green. This is the reason "B" was adopted. When you form the wires to insert into a RJ45 using the "A" standard you will have to cross the green pair over at least one other pair. Using the "B", you will not have to cross any other pair so none of the wires are crimped and the twists are maintained the farthest they can be.
Of course this is all moot with cat6 cable because now the pairs do not lay the same depending on the manufacturer so none of it matters.