RJ-45 Ethernet Cable Wiring: T568A vs T568B Color Order for Modem-Router Connection

Hello,
I admit that I have not dealt with building a network, but I have a question.
I have patched the network cable to connect the modem-router according to the colors in the following order:
white-orange
orange
white-blue
blue
white-green
green
white-brown
brown
On both sides the plug was tight and the network did not work (no net, no automatic ip).

By changing the order on both sides to:
white-orange
orange
white-green
blue
white-blue
green
white-brown
brown
Everything is OK...
The malice of inanimate things, what is it?

It should work for both. Maybe you pinched the pins incorrectly or you have damaged one of the veins.
Take a look here: https://www.elektroda.pl/rtvforum/topic215819.html

Hmm, I use the latter and it always works. Ew is changed from orange to green - also should work.

Maybe someone will need it:

witux wrote:

Take a look here: https://www.elektroda.pl/rtvforum/topic215819.html

After all, the cable clamped according to options 1 and 2 is symmetrical on both sides ... So why 1 does not work?
The best part is that they recommend Option 2 everywhere which is:
By changing the order on both sides to:
white-orange
orange
white-green
blue
white-blue
green
white-brown
brown
Weird line with these colors, but I'll squeeze again and check

Transmission and reception pass through 1,2,3,6 pins. See how it is shown here http://www.gbwr.pl/cie_schemat_rj45.htm

bkroy wrote:

After all, the cable clamped according to options 1 and 2 is symmetrical on both sides ... So why 1 does not work?

It does not work because different colors have different frequency of twisting the wires, with longer sections the crosstalk is too high and the transmission is transformed.

abdenagof wrote:

It does not work because different colors have different frequency of twisting the wires, with longer sections the crosstalk is too high and the transmission is transformed.

All the wires are twisted in the same way, in practice, the colors of the wires can be changed and it will not have any effect on the operation, as for the length, theoretically up to 100m should work, in practice, using a good cable, you can reach up to 200m.
A lan cable tester would be useful here, after checking the correct clamping of the wires, you can also check whether the cable is functional.

PS
There may also be a problem with twisted pair transmission if the LAN cable goes parallel to the power cable in a close distance of

wojtek_1985 wrote:

All the wires are twisted in the same way, in practice you can change the colors of the wires and it will not affect the operation,

You can see buddy that you have never had contact with computer networks and you like to make posts.
Link

In addition, in the 100m section of the twisted pair, individual pairs are of different lengths, the differences reach about 15% between the longest and the shortest pair

abdenagof wrote:

You can see buddy that you have never had contact with computer networks and you like to make posts.
Link


In addition, in the 100m section of the twisted pair, individual pairs are of different lengths, the differences reach about 15% between the longest and the shortest pair

This is just a disadvantage, not an advantage (you can even read it from your link).
These length differences are not the result of transmission, but of twisting inaccuracies, the best situation is when all pairs are twisted in the same way, which is not possible in practice.

And below is a quote from the page from your link:

A parameter closely related to the delay is the delay spread (DELAY SKEW). This parameter results from the construction of the cable, because each pair of wires is twisted with a different pitch, which means that they have a slightly different length. This parameter plays a particularly important role in technologies that use all four pairs for transmission - Gigabit Ethernet. The acceptable difference between the "fastest" and "slowest" pair is 50ns over a distance of 100m. If the measurements show a dangerously high spread and we are dealing with applications using 2 pairs (10Base-T), the system should still work, unfortunately, in the case of networks using 4 pairs, exceeding the allowable threshold is most often the source of transmission failure.

If all pairs were to be twisted the same along their entire length, it would be so, but wise engineers did not accidentally design the cable in this form. Worse than the spread of lags would be the mutual interference if the pairs had the same turning radius. That is why colors should be adhered to, because network cards expect that the pair used for transmission has the appropriate length and radius of twisting in relation to other pairs, if we change the colors, distortions and transmission errors may occur

below a quote from Wikipedia, which clearly shows that the twisting is not a coincidence, the current technology allows the construction of a cable with evenly twisted pairs

Quote:

Twisted-pair wire - a type of signal cable used to transmit information, which is made of one or more pairs of twisted copper wires, with each pair having a different twist length to reduce mutual interference , known as crosstalk. Twisting the wires causes the transmission band to be narrowed at the same time.

abdenagof wrote:

If all pairs were to be twisted the same along their entire length, it would be so, but wise engineers did not accidentally design the cable in this form. Worse than the spread of lags would be the mutual interference if the pairs had the same turning radius. That is why colors should be adhered to, because network cards expect that the pair used for transmission has the appropriate length and radius of twisting in relation to other pairs, if we change the colors, distortions and transmission errors may occur

below a quote from Wikipedia, which clearly shows that the twisting is not a coincidence, the current technology allows the construction of a cable with evenly twisted pairs

Quote:

Twisted-pair wire - a type of signal cable used to transmit information, which is made of one or more pairs of twisted copper wires, with each pair having a different twist length to reduce mutual interference , known as crosstalk. Twisting the wires causes the transmission band to be narrowed at the same time.

When it comes to what is written there, I approach what is written there with the appropriate distance - in the end, each of us can write what we want. And I have never heard of a different twist, so I also approach it with a distance.

It is proposed by my friend an educational game, take a 2m section of the twisted pair, remove the outer protective layer and post your observations on the construction and twisting pairs on the forum. Maybe your distance will decrease.

abdenagof wrote:

It is proposed by my friend an educational game, take a 2m section of the twisted pair, remove the outer protective layer and post your observations on the construction and twisting pairs on the forum. Maybe your distance will decrease.

Maybe I will not destroy the cable, but I clamped different colors many times, but so that the pairs match and it always works.