For a normal cable you can use either T568A or T568B as long as you use|
the same scheme on both ends. For a cross-over cable use one of each.
EIA/TIA 568A Color Scheme
EIA/TIA 568B Color Scheme
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||RJ25 pin||RJ14 pin||RJ11 pin||Pair||T/R||Cat 5e/6 colors||Old colors|
While the old solid color code was well established for pairs 1 and 2, there are several conflicting conventions for pair 3. The colors shown above were taken from a vendor of "silver satin" flat 8-conductor phone cable that claims to be standard. Other 6 pair solid (old) bellwire cables may substitute white for orange. At least one other vendor of flat 8-conductor cable uses the sequence blue, orange, black, red, green, yellow, brown and white/slate.
In modern structured wiring Cat5e or Cat6 is commonly used in homes and buildings. The Cat 5e and Cat 6 data lines are often used for both voice or data. The color codes above are the standard and defined within wiring guides.