I'm going to be doing a 200+ ft run in a month or so to the new
garage, and will try both ways and see if one is more reliable than
the other (I've got four cables run, only need one of them...)
If it interests you, that's cool, but I wouldn't lose sleep over it.
There's absolutely no detectable difference.
AFAIK, the difference is
in the approach of IBM versus other telecom producers. In the 1980's
and 1990's, it was a headache trying to keep up with each system and
its unique connectors.
Also, it depends on the kind of equipment you will be attaching. If
you're equipment wants to see TIA 568A and you wire for 568B, you will
possibly have problems.
All 4 pairs are seldom used. The TIA standard was an attempt to
conventionalize building wiring, that's all. If you look at the RJ-45
connector head on, the blue white pair is always the centre 2 pins on
both TIA 568 A and B. That represents tip 1 and ring 1 (T1, R1).
Surrounding those centre pins is the or O/W pair on T568A and the G/W
on T568B.
So, starting from one end, the pins are numbered 1 to 8, with B/W on
pins 4 and 5. Pins 3 and 6 become O/W on T568A and G/W on T568B.
Here's T568A(hope this comes out):
1 2 3 4 5 6 7 8
T3 R3 T2 R1 T1 R2 T4 R4
w/g g/w w/o bu/w w/bu o/w w/br br/w
note that the w/bu pair are reversed in the middle pins with the o/w
pair around them. The w/g pair is on pins 1 and 2 while the b/w pair
is on pins 7 and 8.
Here's T568B:
1 2 3 4 5 6 7 8
T2 R2 T3 R1 T1 R3 T4 R4
w/o o/w w/g bu/w w/bu o/w w/br br/w
note the b/w and w/br are in the same place on both. So, it's the g/w
and o/w pairs that move. If you regard this arrangment without colour,
there is virtually no difference. They all connect to the same pins on
either end, wire for wire. The difference is in which twisted pair
connects where.
If you have an open-wiring system, the equipment should not care
provided it is connecting to equipment out in the field which uses the
same category. Where it would make a difference is in a system where
the wiring was dedicated from a jack field to specific equipment.
That's not something I think you'd encounter.