User:Reverend Loki/test

8P8C

See modular connector for numbering of the pins in these 8P8C modular connectors.

The assignments of wire pairs to plug and jack pins are as follows:

T568A/B RJ45 Wiring
Pin	T568A Pair	T568B Pair	Wire	T568A Color	T568B Color
1	3	2	tip	white/green stripe	white/orange stripe
2	3	2	ring	green solid	orange solid
3	2	3	tip	white/orange stripe	white/green stripe
4	1	1	ring	blue solid	blue solid
5	1	1	tip	white/blue stripe	white/blue stripe
6	2	3	ring	orange solid	green solid
7	4	4	tip	white/brown stripe	white/brown stripe
8	4	4	ring	brown solid	brown solid

Note that the only difference between T568A and T568B is that pairs 2 and 3 (orange and green) are swapped. Both standards wire the pins "straight through", i.e., pins 1 through 8 on one end are connected to pins 1 through 8 on the other end. Also, the same sets of pins are paired in both standards: pins 1 and 2 form a pair, as do 3 and 6, 4 and 5 and 7 and 8. The different pairs in an ethernet wire have different impedances, so an orange pair can not be connected directly to a green pair. In order to connect two different pairs together, a hub or switch or higher level piece of equipment like a router must be placed between the two. Splicing two cables together will result in improper termination and reflections will occur in the line. These reflections will cause errors and lower the available throughput in the wire.

UTP cables terminated according to T568A on one end and T568B on the other end are known as Ethernet crossover cables.

6P6C

Holding the connector in your hand tab side down with the cable opening toward you, the pins are numbered 1–6, left to right.


Position	Pair	T/R	±	RJ11	RJ14	RJ25	Twisted pair colors	25-pair colors	Old colors^[a]	German colors^[b]	Australian colors
1	3	T	+			T3	white/green	white/green	white	pink	orange
2	2	T	+		T2	T2	white/orange	white/orange	black	green	red
3	1	R	-	R1	R1	R1	blue	blue/white	red	white	blue
4	1	T	+	T1	T1	T1	white/blue	white/blue	green	brown	white
5	2	R	-		R2	R2	orange	orange/white	yellow	yellow	black
6	3	R	-			R3	green	green/white	blue	gray	green

^[a] While the old solid color code was well established for pair 1 and usually pair 2, there are several conflicting conventions for pair 3 (and sometimes even pair 2). The colors shown above were taken from a vendor of "silver satin" flat 8-conductor phone cable that claims to be standard. 6-pair solid (old) bellwire cables previously used by the Bell System use white for pair 3 tip but some vendor's cable may substitute orange for white. At least one other vendor of flat 8-conductor cable uses the sequence blue, orange, black, red, green, yellow, brown and white/slate.
^[b] This color scheme originates in the (withdrawn) national standard DIN 47100. The scheme shown here is the correct color code for interfacing with the RJ connector standards.

--Reverend Loki (talk) 21:20, 17 August 2011 (UTC)