How/Why there are 4 twisted pairs in UTP/STP
 

Hello,
I'm sorry in advance for such a newbie question, but I'd like to know more about how networks work physically, and came to this question.

In some older materials I have, there are UTP cables shown and described. They contain two twister pairs on for sending and one for recieving.

However, RJ-45 connector has 8 pins, and cables used with it have 4 twisted pairs. Now I've heard the method used to trasmit signal is called differential signaling, but I don't know anything else about it.

Would anyone mind to elaborate, and post why is better to have 4 twisted pairs there, how does the method work, etc.?


Thanks,

Skyer

Member response
 

Hi,
Look at 'Ethernet over twisted pair';
Definitions from the above should provide enough information to aid in understanding. Twisted pairs are used to reduce signal noise from EMI due to the noise canceling effect of the pairs.

Look at differential signaling to get a basic understanding. This Transmission/Receiver technique has been around long before Ethernet.
HTH!

Thank you, I'll check it. The biggest part of the problem, I guess, is the language barrier :).


Skyer

Member response
 

Hi,
If you have a problem or question then feel free to query. Basic understanding for signal transmission/reception for UTP is not that difficult. Yes, the semantics can be difficult but most of the content is linked to expand your understanding.
If it is a linguistics barrier then we will still be glad to help where we can. :)

Alright,
seems like I've found what I needed. I'll go through the materials you've posted - and hope you don't mind me asking question, eventually.


Skyer

Member response
 

Hi,

Fire away!

If I cannot answer then I am sure that we can figure things out somehow. :)
Or someone else here on LQ can augment any findings or questions.
:hattip: