Cross cable scheme ??

Yesterday i've had to make crossover cable. So i tried to make one by wiring order noted in my notebook (B-A).
And you know what - it doesn't work.

Then i found this wiring scheme that works (?).

After that i checked on the Net, and found a whole bunch of sites on which they say that B-A is correct crossover wiring. So, 1 site with working scheme and 99 with 'correct' non-working one.

However, tomorrow i have to make another cross cable and i'm very confused.
Should i use scheme that works or one that should work?

One more Qn.
I should connect tp-link tl-sg1008d switch with D-Link DGS-1008D (or maybe Zyxel ES108 100Mbs).
As i can recall these 2 switches don't have dedicated uplink ports (i think Zyxel have 2), so do i have connect them with cross cable, or they have automatic port switching no matter of sort of cable.

Many thanks

 

Only difference between 568-A and 568-B is the Green's and Orange's are flipped.

B: White Orange\Orange\White Green\Blue\White Blue\Green\White Brown\Brown

A: White Green\Green\White Orange\Blue\White Blue\Orange\White brown\Brown.

How to Make a Patch Cable

 

99% of modern switches use a straight through cable.

 

Also, you only need one cross-over in any link between switches. Only one of the switches in any pair needs to cross over its port if you use a straight-through cable.

So as long as one of the two switches you use, has auto-sensing ports that will automatically change to cross over mode or has a dedicated uplink port, you'll be fine.

Also - if the switches are closed together (within 5 metres), I would always buy ready made cables. Connecting RJ45 connectors onto CAT5e cable is easy. However, doing so without introducing susceptibility to RF noise is a skill that takes a lot of practice and guidance. For short lengths, it just isn't worth the effort when ready made cables are so cheap and easily obtained.

 

Thanks for the replies.

The strange thing here is the crossover scheme:
B: White Orange\Orange\White Green\Blue\White Blue\Green\White Brown\Brown
<-->
A: White Green\Green\White Orange\Blue\White Blue\Orange\White brown\Brown
didn't work to me

And the following:
B: White Orange\Orange\White Green\Blue\White Blue\Green\White Brown\Brown
<-->
A: White Green\Green\White Orange\White Brown\Brown\Orange\Blue\White Blue
IS OK

How comes?

Could someone test this?

 

Ok, understand that, but let me reformulate: WHY the mentioned scheme works in regards it is completely different from 'official' one.
(And why that /and as i know, only that/ site gives exact that 'wrong' /but working/ scheme?) - isn't it a bit confusing ?


Thanks

 

If you want to learn more about cabling, I can highly recommend Practical Network Cabling (Que publishing, ISBN 078972247X). Easy to read with lots of useful information.

If you want to do this professionally, most good cabling companies (Krone and Molex for example) offer courses to train you to install their cabling correctly. Once trained you'll be able to offer manufacturer's warranties with your installs. The good cable companies work hard to ensure that the people installing their products know what they are doing as good installation is essential for best performance from their cables.

 

I don't understand. I did list the official ones. There is no other way to do it.

Orange's and greens do the send and receive. (pins 1236) the rest are just to cancel out noise. The connection will still work if the blues and browns aren't even connected.
Many times in homes with limited cat5 runs we use the blues to run a phone line on the same peice of cable.

 

That's it!
In the mentioned site's scheme, greens and oranges have the same order as in official one (1236), and blues and browns have different position.

Thanks a lot for this clarification, and all replies.

 

That site's crosover diagram is wrong. Blue's and Brown's don't change.
It will probably still work but the official 568-A and 568-B wiring is correct on the site I posted the link to.

 

This is the correct one dude.

When I crimp, I make sure that the wire ends are straightly aligned after I cut it. Then ALL the ends are sticking to the inner most part of RJ-45.

 

These are the best thing since sliced bread.

http://www.newtechindustries.com/newtech/platinumtools/ezrj45_cat5e_connector.htm