I was given a network diagram, and the question asks: what pin numbers on each RJ45 jack are used for...?

Question

According to the diagram given to me, I need to answer what pin numbers on each RJ45 jack are used for transmitting and receiving data

My guess is RJ45 doesn't rely on the same pin number to always transmit data, and it doesn't rely on the same pin number to always receive it either.

How do we know which pin numbers transmit and receive data and what determines that?

Answer 1

The answer depends on the physical circuit going across the RJ45 jack. For example, the pin-outs for a T1 are different than that for Ethernet which, in turn, are different from a 56K DDS line. However, all three can be wired onto an RJ45 jack.

On your network diagram, though, they're most probably looking for pinouts for 10BaseT:

1: Transmit +
2: Transmit -
3: Receive +
4: not used
5: not used
6: Receive -
7: not used
8: not used

Answer 2

First, I appreciate your help (all of you)

I know this is gonna make me look dumb, but I'm a little confused.

Goat_cheez says:
The answer depends on the physical circuit going across the RJ45 jack.

So, I conclude the physical circuit will determine which pin# is for transmitting and receiving

However, ShivaLee and Arc-in-the-sky say my guess is wrong (by which I assume there are specific pins that used for transmitting and receiving)

Also I looked at a couple of websites, one website says:
pin#4 and pin#1 are used for transmitting and receivining respectively
But, the other says:
pin#1,2 are for transmitting and pin#3,6 are for receiving.

So, I still don't get it

Answer 3

youre guess is wrong. thats why there are different types of cabling. the first is roll over cable, cross over cable, and a straight through cable. the color coding for each cable is significant in installing a network.

RJ45 is only a connector you must try to search the cable first which is basically what you are asking for. Try Searching on google category 5 or CAT5 on the internet. And by the way there is color coding when you are assembling cables thats why some of on the internet are pretty messed up.

Answer 4

hi..
ur assumption is wrong, there are specific pins for transmitting and receiving data on RJ45.
U can find more info here abt it

http://en.wikipedia.org/wiki/RJ-45

Answer 5

plug it in and then reboot your pc.... if nothing happens then u know something is wrong.. if you connect then problem solved hopefully... *thank god I have a hubby who knows what hes doing he shud or MCI and Cisco wudnt have hired him for so long* lol