View source for Talk:TIA-568A

===TIA-568A and RJ-45 inconsistency===

This part of the [[RJ-45]] article:

:''“The original concept'' (presumably [[RJ11, RJ14, RJ25|RJ11]], [[RJ11, RJ14, RJ25|RJ14]], [[RJ11, RJ14, RJ25|RJ25]] and [[RJ61]]) ''was that the centre two pins would be one pair, the next two out the second pair, and so on until the outer pins of an eight-pin connector would be the fourth twisted pair. Additionally, signal shielding was optimised by alternating the "live" and "earthy" pins of each pair. This standard for the eight-pin connector results in a pinout known as TIA-568A, but the outermost pair are then too far apart to meet the electrical requirements of high-speed LAN protocols. The variation known as TIA-568B overcomes this by using adjacent pairs of the outer four pins for the third and fourth pairs. The inner four pins are wired identically to TIA-568A.”''

seems to suggest that the normal wiring of TIA-568A should be:

# [[Image:Pair_4_wire_1_horizontal_stripe.png|37px|Pair 4 Wire 1]] white/brown
# [[Image:Pair_3_wire_2_horizontal_stripe.png|37px|Pair 3 Wire 2]] green/white
# [[Image:Pair_2_wire_1_horizontal_stripe.png|37px|Pair 2 Wire 1]] white/orange
# [[Image:Pair_1_wire_2_horizontal_stripe.png|37px|Pair 1 Wire 2]] blue/white
# [[Image:Pair_1_wire_1_horizontal_stripe.png|37px|Pair 1 Wire 1]] white/blue
# [[Image:Pair_2_wire_2_horizontal_stripe.png|37px|Pair 2 Wire 2]] orange/white
# [[Image:Pair_3_wire_1_horizontal_stripe.png|37px|Pair 3 Wire 1]] white/green
# [[Image:Pair_4_wire_2_horizontal_stripe.png|37px|Pair 4 Wire 2]] brown/white

(with pairs 2 and 3 swapped for 10/100Base-T crossover wiring), while according to the [[TIA-568A#Diagram|diagram in TIA-568A article]] it is actually:

# [[Image:Pair_3_wire_1_horizontal_stripe.png|37px|Pair 3 Wire 1]] white/green
# [[Image:Pair_3_wire_2_horizontal_stripe.png|37px|Pair 3 Wire 2]] green/white
# [[Image:Pair_2_wire_1_horizontal_stripe.png|37px|Pair 2 Wire 1]] white/orange
# [[Image:Pair_1_wire_2_horizontal_stripe.png|37px|Pair 1 Wire 2]] blue/white
# [[Image:Pair_1_wire_1_horizontal_stripe.png|37px|Pair 1 Wire 1]] white/blue
# [[Image:Pair_2_wire_2_horizontal_stripe.png|37px|Pair 2 Wire 2]] orange/white
# [[Image:Pair_4_wire_1_horizontal_stripe.png|37px|Pair 4 Wire 1]] white/brown
# [[Image:Pair_4_wire_2_horizontal_stripe.png|37px|Pair 4 Wire 2]] brown/white

which, incidently, is exactly the same as TIA-568B crossover wiring according to the [[TIA-568B#Diagram|diagram in TIA-568B article]] (and vice versa, [[TIA-568A]] crossover is [[TIA-568B]] normal wiring).

I am going to merge [[TIA-568A]] and [[TIA-568B]] articles for they differ only with the order of wires, whatever it is, but first I want to know whether the original diagrams which I have based the tables on are correct. They (the TIA-568A ones) seem to be incorrect in the context of [[RJ-45]] article, unless the latter itself is incorrect. In any case, they both appear to be mutually contradictory and need to be corrected.

[[User:Rfl|Rafa&#322; Pocztarski]] 07:31, 30 Jul 2004 (UTC)

Also, the [[RJ-45]] article says:

:''“The variation known as TIA-568B overcomes this by using adjacent pairs of the outer four pins for the third and fourth pairs. The inner four pins are wired identically to TIA-568A.”''

which is not true according to the [[TIA-568A#Diagram|TIA-568A diagram]] and table:

# [[Image:Pair_3_wire_1_horizontal_stripe.png|37px|Pair 3 Wire 1]] white/green
# [[Image:Pair_3_wire_2_horizontal_stripe.png|37px|Pair 3 Wire 2]] green/white
# [[Image:Pair_2_wire_1_horizontal_stripe.png|37px|Pair 2 Wire 1]] white/orange
# [[Image:Pair_1_wire_2_horizontal_stripe.png|37px|Pair 1 Wire 2]] blue/white
# [[Image:Pair_1_wire_1_horizontal_stripe.png|37px|Pair 1 Wire 1]] white/blue
# [[Image:Pair_2_wire_2_horizontal_stripe.png|37px|Pair 2 Wire 2]] orange/white
# [[Image:Pair_4_wire_1_horizontal_stripe.png|37px|Pair 4 Wire 1]] white/brown
# [[Image:Pair_4_wire_2_horizontal_stripe.png|37px|Pair 4 Wire 2]] brown/white

and [[TIA-568A#Diagram|TIA-568B diagram]] and table:

# [[Image:Pair_2_wire_1_horizontal_stripe.png|37px|Pair 2 Wire 1]] white/orange
# [[Image:Pair_2_wire_2_horizontal_stripe.png|37px|Pair 2 Wire 2]] orange/white
# [[Image:Pair_3_wire_1_horizontal_stripe.png|37px|Pair 3 Wire 1]] white/green
# [[Image:Pair_1_wire_2_horizontal_stripe.png|37px|Pair 1 Wire 2]] blue/white
# [[Image:Pair_1_wire_1_horizontal_stripe.png|37px|Pair 1 Wire 1]] white/blue
# [[Image:Pair_3_wire_2_horizontal_stripe.png|37px|Pair 3 Wire 2]] green/white
# [[Image:Pair_4_wire_1_horizontal_stripe.png|37px|Pair 4 Wire 1]] white/brown
# [[Image:Pair_4_wire_2_horizontal_stripe.png|37px|Pair 4 Wire 2]] brown/white

i.e. the inner four pins in TIA-568B are ''not'' wired identically to TIA-568A.

Most probably, the quoted paragraph from [[RJ45]] is incorrect.

[[User:Rfl|Rafa&#322; Pocztarski]] 02:54, 1 Aug 2004 (UTC)

== merging TIA-568A and B ==

I have merged these two articles, added extra material and deleted both TIA-568A and TIA-568B and installed redirects in their place. The merged article is [[TIA-568A/B]]. Let me know what you think. [[User:Karn]] 15 May 2005.