Showing posts with label IoT. Show all posts
Showing posts with label IoT. Show all posts

Saturday, December 31, 2022

RJ45 Ethernet Cable Color Standard - T568A and T568B - EIA/TIA Standard

Demystifying RJ45 Ethernet Cable Color Standards: T568A vs. T568B in EIA/TIA Standard

Back in the past, a few decades ago, there were no standard regulations for the wiring of structured networks in the IT industry.

The standards for these networks were decided upon by the companies or professionals responsible for installing the wired networks. 

This lack of standardization made it difficult to maintain or modify the network structures of companies, especially when done by another company or professional.

To address this issue and with the increasing growth of technology and infrastructure for wired networks, the TIA/EIA standards were developed. 

In 1991, the TIA/EIA, 568A and 568B standards were introduced by the Electronic Industries Association (EIA) and the Telecommunications Industry Association (TIA) to standardize the electrical and electronic connections of network cables and their connections. 

The 568A standard was revised in 1994 to include Category 4 and Category 5 (UTP - Unshielded Twisted Pair) wiring, and in 2001 the EIA/TIA 568-B standard was published, covering a total of 10 different categories.

You may be interested in: 

T568A and T568B Categories

There are two different categories of TIA/EIA standards, commonly known as RJ45 Standard B and RJ45 Standard A, which are actually T568A and T568B.

These are termination standards used by Internet Providers, Backbone Infrastructure, Industrial Wiring Infrastructure, and also by small businesses and residential wiring.

However, the difference between these two categories is that the orange/white and green/white pairs, which correspond to pins 1 & 2, 3 & 6, are exchanged in the assembly of the cable, as illustrated in Figure 1 below.

Fig.1-Standard-Colors-Cable-Network-RJ45-T-568A-T-568B-Standard-EIA/TIA

It is worth remembering that even with changes to the set of pairs, when the same standards are used at both ends of the cable, the results will be the same, with direct connections at their ends.

In Table 1 below, we have the configuration of the pins and their corresponding colors, following the two standards side by side for comparison.

Sequential Table of Colors and Pinning Standard T-568A and T-568B

PinT-568AT-568B
1White/GreenWhite/Orange
2Green        Orange
3White/OrangeWhite/Green
4BlueBlue 
5White/BlueWhite/Blue
6OrangeGreen
7White/BrownWhite/Brown
8BrownBrown

The T568A standard is the widely accepted standard because it is compatible with most wiring schemes and is what I recommend for most applications.

Crossover Cable

Crossover cables, use the T-568A and T-568B standards at each end as illustrated in Figure 2 below. These categories of cables are used when we need to, for example, connect two computers or laptops without using a router or switch.

Fig. 2 - Connection of Crossover Cable Standards T-568A and T-568B

It is worth remembering that if you are still using older equipment, you should not connect crossover cables between the computer and a switch or router, as in some cases it can damage the equipment.

Now if you work with newer, more modern equipment, they use AUTO MDI/MDIX technology, which automatically identifies the connected interface and even if it is of the crossover type, there is no problem, as it automatically configures itself.

I hope you enjoyed it!!!

If you have any questions, suggestions or corrections, please leave them in the comments and we will answer them soon.

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Sunday, August 22, 2021

PinOut - ARDUINO Mega Rev3 Board - ATMega328PU

Fig. 1- Arduino Mega Rev3 Board - arduino.cc

The Arduino Mega 2560 is a microcontroller board based on the ATmega2560. It has 54 digital input/output pins (of which 15 can be used as PWM outputs), 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button.

Click here to Arduino Datasheet

Source: arduino.cc

If you have any questions, suggestions or corrections, please leave them in the comments and we will answer them soon.

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Saturday, September 12, 2020

PinOut - ARDUINO UNO Board - ATMega328PU

Main Features

Arduino UNO is a microcontroller board based on the ATmega328P. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator, a USB connection, a power jack, an ICSP header and a reset button. 

It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started. 

You can tinker with your UNO without worrying too much about doing somethin

Click here to Datasheet

Source: arduino.cc

If you have any questions, suggestions or corrections, please leave them in the comments and we will answer them soon.

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My Best Regards!!!