T568A vs T568B: Usage Scenarios, Advantages and Non-Standard Wiring Possibilities

Hello everyone. I am referring to this forum with two questions that I am not able to deal with or find a reasonable answer with.

Namely:
we have T568A and T568B standard
1) Which one should you use and why? (possibly in what situations and why)
2) Is it possible to disregard the standards (eg by swapping the blue pair with the brown pair independently at both ends of the cable) and create a working cable?

Please help

https://learningnetwork.cisco.com/thread/52947
http://www.controlcable.com/custom.asp?c=6108...+Wiring+Schemes+--+What%27s+the+Difference%3F
The truth is, each of these standards is good, it's important to follow one on a given network so that you don't have to run to the other end of a 90-meter cable and check which colors are in sequence.
In the states (Cisco) they prefer B, in Poland they prefer A.

Assuming that it is a home environment, both standards seem to be fine, while the t568a standard seems to be used in networks where there is a possibility of interference with the telephone network. The t568b standard seems to be more popular and used because the pin pairs ensure faster data transmission. I found so many.

Is what I wrote true or am I missing it somewhere? is anyone able to confirm or add something more ??

bobsonn91 wrote:

The t568b standard seems to be more popular and used because the pin pairs ensure faster data transmission. I found so many.

Where did you find this?? So what, if I connect in t568a, I will have a connection between computers / devices, e.g. 10MBit, and as in t568b, the same connection will jump to 100MBit? It's bullshit

https://learningnetwork.cisco.com/thread/20757

7 comment.

Perhaps I misinterpreted something or translated it incorrectly:

According to CISCO standards, EIA / TIA T568B is the standard currently used. However, the type of the adopted sequence of numbering pairs of colored transmission wires from the point of view of the network is indifferent. In the case of network expansion, however, care should be taken to consistently apply the previously adopted sequence.

T568A is advantageous if you want to leave pins 1 2 and 7 8 - in the middle you get 2 connection pairs for analog telephone lines (POTS) terminated with an RJ11 connector, which can be connected to an RJ45 patch panel or a two-port analog modem (obsolete).
The T568B has been used frequently with what is known as "structured topology" to extend the life cycle to over 10 years. No tight bends, all connections at 90 degrees to reduce electronic interference.

T568B with all the additional rules was supposed to be better for VoIP and 1G bandwidth because the lines were optimized for higher transmissions at 500MHz (vs 250), as the standard? "B" uses an improved signal-to-noise ratio for STP. This allows twisted pair cables to be used for RJ45 connections in a patch panel with an accuracy of millimeters instead of inches. Oxygen-free cabling is used by suppliers such as Ortronic, which also offers a lifetime warranty against manufacturing defects. However, can you apply these principles to the standard? "A" and get similar results.

bobsonn91 wrote:

Namely:
we have T568A and T568B standard

You're confusing the concepts. We have EIA / TIA-568B standard. It replaced the older EIA / TIA-568A.
However, what you are talking about is called the sequence of unraveling the cables, mistakenly called standard (incorrect English translations).

bobsonn91 wrote:

https://learningnetwork.cisco.com/thread/20757

7 comment.

Perhaps I misinterpreted something or translated it incorrectly:

According to CISCO standards, this is EIA / TIA T568B [..]

Of course you are misinterpreting you confusing the wiring standard for the furrow sequence.

From what I found, this:

The wiring standard is defined by TIA/EIA-568. In 1991, the first revision of the standard, TIA/EIA-568-A, was released. In 2001, TIA/EIA-568-B was released. In 2008 (?), the new version TIA/EIA-568-C was released. The standard now defines that the wiring by color code 568-B is completely deprecated, not valid anymore. The only valid color code for structured wiring with twisted pair cable CAT 5/6/7 shall be the same color code as with the older 568-A!!

(http://www.proav.de/index.html?http&&&www.proav.de/data/cables/CAT5.html)
You can also try to get through: https://web.archive.org/web/20160303194352/ht...tandards/about/documents/StarReport_10-11.pdf

This means that the "A" standard was created in 1991, then in 2001 "B" was introduced, and then around 2010 (see the second document) - the "C" standard was introduced, restoring the color scheme as from "A".

So if we want to be "up to date", we should use "A". However, for a small installation - it does not matter as long as we do not mix them up A lot of equipment works even when we have different ends - the so-called crossover (but this is not a rule)