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Question RJ45 ethernet cable wiring

cablecutter

Junior Member
Apr 10, 2020
5
0
11
I am trying to create a cable for my home networking with RJ45 connectors and Cat5e cable
Noticed this wiring diagram and it shows only 4 wires are used for data transmission (other 4 wires are unused)
Can someone confirm if this is correct and does this affect the data transmission speed?


1586537146704.png
 

ch33zw1z

Lifer
Nov 4, 2004
33,965
12,801
146
It's only wrong in the fact that it's legacy, only defining the pinout for 10/100mbps. You still follow that pinout for making gigabit cables..
 
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cablecutter

Junior Member
Apr 10, 2020
5
0
11
When making the Gigabit cable, out of these pins, which pins control the data speed
When it's connected with pins 1,2,3 and 6, my internet still working with almost 40% speed
Which pins are critical in 568B format?

1588021726623.png
 

mxnerd

Diamond Member
Jul 6, 2007
6,152
886
126
You have been told all four pairs are required for gigabit operation.


1000BASE-T uses all four pairs bi-directionally using hybrid circuits and cancellers. Data is encoded using 4D-PAM5; four dimensions using PAM (pulse amplitude modulation) with five voltages, −2 V, −1 V, 0 V, +1 V, and +2 V. While +2 V to −2 V may appear at the pins of the line driver, the voltage on the cable is nominally +1 V, +0.5 V, 0 V, −0.5 V and −1 V.

You should look at the LED light on switch/router/NIC port to tell whether it's operated at gigabits speed. You also did not mention how did you test the speed. And wired or wifi?
 
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