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Have you always wondered what was the difference between T568A and T568B when making a patch cable or punching down a Keystone Jack; and did it really matter which one you used?  Both wire standards use eight position ports for connection to transmit data, but both have a different color scheme making them different.

T568A has a color scheme of: green/white, green, orange/white, blue, blue/white, orange, brown/white, brown.  Though T568B only switches up the orange and green position making its color scheme the following:  orange/white, orange, green/white, blue, blue/white, green, brown/white, brown.  As T568B is more up-to-date than T568A, it is the preferred wiring scheme to use since it accommodates for the current and future needs of transmitting data according to the ANSI, TIA, and the EIA.

While it does not matter which wire standard is used, they should never be combined since it will result in data loss during transmission.  When upgrading your existing system, be sure to check that the same wiring standard is being used, regardless of whether you are adding a patch cable, patch panel, or Keystone Jack.