I've always done this at *both* ends of a straight through cable: pin1 blue stripe pin2 blue pin3 orange stripe pin4 orange pin5 green stripe pin6 green pin7 brown stripe pin8 brown Mate of mine says it's all wrong. Google confuses me still further. Is there anything wrong with my wiring? Thanks, Steve.
On Fri, 2003-04-18 at 12:04, fsanta wrote:
I've always done this at *both* ends of a straight through cable:
pin1 blue stripe pin2 blue pin3 orange stripe pin4 orange pin5 green stripe pin6 green pin7 brown stripe pin8 brown
Mate of mine says it's all wrong. Google confuses me still further. Is there anything wrong with my wiring? Thanks, Steve.
Here is a more "official" source: http://yoda.uvi.edu/InfoTech/rj45.htm I've known patch cables to work as long as both ends of the cable match. Matt
On Friday 18 April 2003 20:16, Matt wrote:
On Fri, 2003-04-18 at 12:04, fsanta wrote:
I've always done this at *both* ends of a straight through cable:
pin1 blue stripe pin2 blue pin3 orange stripe pin4 orange pin5 green stripe pin6 green pin7 brown stripe pin8 brown
Mate of mine says it's all wrong. Google confuses me still further. Is there anything wrong with my wiring? Thanks, Steve.
Here is a more "official" source:
http://yoda.uvi.edu/InfoTech/rj45.htm
I've known patch cables to work as long as both ends of the cable match.
Matt
Hi and thanks. So it seems that mine is totally wrong and shouldn't work. So why does it? Or maybe it's not working as fast as it should be? Steve.
Steve, A straight through cable as you have been building will work just fine for a short distance. That distance depends on all sort of things such as how the wire is run, how close it is to other wires, and a whole buch of other electromagnetic gobbly gook. The twisting of the pairs is done to provide a "cleaner" signal through the patch cable. Using the standard twist will provide a longer capability with the same cable. If you have a chance give it a try get 100' of cat5 and put on the ends straight through as you have been doing and then try it. If it don't work, try the twist method, you should see the difference right away. Ron On Friday 18 April 2003 03:32 pm, fsanta wrote:
On Friday 18 April 2003 20:16, Matt wrote:
On Fri, 2003-04-18 at 12:04, fsanta wrote:
I've always done this at *both* ends of a straight through cable:
pin1 blue stripe pin2 blue pin3 orange stripe pin4 orange pin5 green stripe pin6 green pin7 brown stripe pin8 brown
Mate of mine says it's all wrong. Google confuses me still further. Is there anything wrong with my wiring? Thanks, Steve.
Here is a more "official" source:
http://yoda.uvi.edu/InfoTech/rj45.htm
I've known patch cables to work as long as both ends of the cable match.
Matt
Hi and thanks. So it seems that mine is totally wrong and shouldn't work. So why does it? Or maybe it's not working as fast as it should be? Steve.
On Friday 18 April 2003 8:32 pm, fsanta wrote:
On Friday 18 April 2003 20:16, Matt wrote:
On Fri, 2003-04-18 at 12:04, fsanta wrote:
I've always done this at *both* ends of a straight through cable:
pin1 blue stripe pin2 blue pin3 orange stripe pin4 orange pin5 green stripe pin6 green pin7 brown stripe pin8 brown
Mate of mine says it's all wrong. Google confuses me still further. Is there anything wrong with my wiring? Thanks, Steve.
Here is a more "official" source:
http://yoda.uvi.edu/InfoTech/rj45.htm
I've known patch cables to work as long as both ends of the cable match.
Matt
Hi and thanks. So it seems that mine is totally wrong and shouldn't work. So why does it? Or maybe it's not working as fast as it should be? Steve.
There are 2 issues here: 1] Simple DC connectivity ========================= The cable carries 4 complete 'go and return' circuits. Without checking the specs, your configuration probably maps each 'go' and 'return' on the near machine to the corresponding 'return' and 'go' on the far machine. 2] AC connectivity ================== Done correctly, the 'go' and 'return' of a single circuit should be in the 2 cores of the _same_ twisted pair. Again, without checking the specs, your scheme is probably putting the 'go' and 'return' in different twisted pairs. We are talking high frequency AC here, not simple DC - ie the capacitor effect between circuits and the magnetic linkage between circuits as the currents change will induce unwanted currents in other circuits. This will increase the 'crosstalk' between circuits - ultimately beyond a certain length of cable, the crosstalk from other circuits will become significant relative to the intended signal on any circuit and reliability will fall off. In the whole tcp/ip scheme of things, packets will be dropped and retransmissions required. Can I suggest you get 500mm of cat 5 cable and strip 300mm - there is nothing like seeing it. The 4 twisted pairs may themselves be very lightly twisted together, but should fall apart into pairs of each colour and its stripe. You will see that the twists in the pairs are of different pitches. The twists ensure that over any substantial number of pitches, both the electric and magnetic fields cancel out on any given side of the pair. The different pitches of the twists on pairs ensures that the benefit of twisting the pairs is not outwitted by the colour core of 1 pair always laying on the colour core of another pair and the stripes of the same respective pairs laying on each other at the half twist points - ie the colour and the stripe of one pair will ideally both have roughly equal contact with the both the colour and stripe of any other pair. So, if you do it to the book, you get the benefit of all that hidden design. HTH Vince Littler
The 03.04.18 at 21:04, fsanta wrote:
I've always done this at *both* ends of a straight through cable:
pin1 blue stripe pin2 blue pin3 orange stripe pin4 orange pin5 green stripe pin6 green pin7 brown stripe pin8 brown
Mate of mine says it's all wrong. Google confuses me still further. Is there anything wrong with my wiring?
Your friend is correct. That cable may work for 10mbps, short distance, but not for 100mbps or longer distance. Pin3 and pin6 should be a twisted pair, and above they aren't. Pins 4 and 5 are sometimes used for voice (phone) applications, so you could skip them for ethernet (and 7,8). Only pins 1-2, 3-6 are needed. -- Cheers, Carlos Robinson
On Saturday 19 April 2003 01:25, Carlos E. R. wrote: there's a good link where you can get that kind of information. http://www.hardwarebook.net/
The 03.04.18 at 21:04, fsanta wrote:
I've always done this at *both* ends of a straight through cable:
pin1 blue stripe pin2 blue pin3 orange stripe pin4 orange pin5 green stripe pin6 green pin7 brown stripe pin8 brown
Mate of mine says it's all wrong. Google confuses me still further. Is there anything wrong with my wiring?
Your friend is correct. That cable may work for 10mbps, short distance, but not for 100mbps or longer distance. Pin3 and pin6 should be a twisted pair, and above they aren't.
Pins 4 and 5 are sometimes used for voice (phone) applications, so you could skip them for ethernet (and 7,8). Only pins 1-2, 3-6 are needed.
On 04/19/2003 03:04 AM, fsanta wrote:
I've always done this at *both* ends of a straight through cable:
pin1 blue stripe pin2 blue pin3 orange stripe pin4 orange pin5 green stripe pin6 green pin7 brown stripe pin8 brown
Mate of mine says it's all wrong. Google confuses me still further. Is there anything wrong with my wiring?
At work, this was the way whoever installed the cables wired them. I had long ago found a color chart on the internet that was the same as Matt's link, http://yoda.uvi.edu/InfoTech/rj45.htm (great link :-) ). Anyway, all new cables I added were wired as per the specs in the link. When I was able to up all the NICs on the network to 10/100 Mbs to run at 100, some machines quit working. After some troubleshooting (they all worked at 10 Mbs), I found all that failed were the old wiring. I decided to change the wiring to match the spec (just changed the plugs), and they all worked as expected. So, experience tells me your wiring will work at 10 Mbs but not 100. HTH. -- Joe Morris New Tribes Mission Email Address: Joe_Morris@ntm.org Web Address: http://www.mydestiny.net/~joe_morris Registered Linux user 231871 God said, I AM that I AM. I say, by the grace of God, I am what I am.
participants (7)
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Carlos E. R. -
fsanta -
Joe Morris (NTM) -
Marco Oliveira -
Matt -
Ron Joffe -
Vince Littler