RJ45 - All about

RJ45 connector
RJ45 connector

RJ45


This cable is also called ETHERNET cable its connector is called 8P8C connector (8 positions and 8 electrical contacts).

This connector is physically compatible with the RJ11
RJ11
RJ11 – Regitered Jack 11 – is used for the landline. It is an international standard for connecting the fixed telephone to the telecommunications network.
RJ11 uses a 6-slot connector. In this one RJ11 has 6 slots (positions) and two drivers, the standard is written 6P2C. The information transmitted on the line can be digital (DSL) or analog. The telephone cable that arrives at the subscriber has 4 cond......
connector if an adapter is used.
On RJ45 computer cabling in 10/100 Mbps, only 4 pins 1-2 and 3-6 are used to transmit information.
In 1000 Mbps (1Gbps) of transmission, the 8 pins of the socket are used.
Two RJ45 cabling standards are mainly used to cable outlets : the T568A standard and the T568B standard.
These standards are very similar : only pairs 2 (orange, white-orange) and 3 (green, white-green) change.

There are 6 categories of RJ45 transmission cords. For a particular network a category 5 RJ45 cable is sufficient. For larger networks, there is a higher category RJ45 cable (5E or 6).
RJ45 internet port on a laptop
RJ45 internet port on a laptop

Color codes

The cabling industry uses cabling code standards. These standards allow technicians to reliably predict how the Ethernet cable ends at both ends in order to facilitate the work of technicians, this serves as a benchmark and allows to know the function and connections of each pair of strands.
The ethernet cable socket cabling follows the T568A and T568B standards.

There is no electrical difference between the different strands T568A and T568B, so neither is better than the other. The only difference between them is how often they are used in a particular region or type of organization.
Thus, your choice of color code will largely depend on the country in which you work and the types of organizations for which you install it.

RJ45 right :

The straight cable (marked PATCH CABLE or STRAIGHT-THROUGH CABLE) is used to connect a device to a network hub or network switch.
The strands are connected in a straight line to the 2 connectors, the same strand on the same contact.

T568A

T568A is the majority standard followed for individuals in European and Pacific countries. It is also used in all U.S. government facilities.

T568A Right


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right and crossover RJ45 wiring diagram
right and crossover RJ45 wiring diagram

T568B

T568B is the standard followed by the majority of Ethernet installations in the United States. This is the most commonly used standard for corporate cabling.

T568B right

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T568A crossover

The crossover cable (marked CROSSOVER CABLE) is typically used to connect two hubs or network switches.
Pairs 2 and 3 are crossed keeping the same polarity. Pairs 1 and 4 are also crossed, but in addition to this, the strands composing each of these pairs are also crossed, causing a change in polarity.
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T568B crossover

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RJ45 connector
RJ45 connector

So for a cross-link :

The RJ45 links of the transmitter and receiver are reversed :
The transmit pair on one side is connected to the receiving pins on the other side.


Types of RJ45 cables

Called Ethernet cables. The cables referred to as Cat5, Cat6 and Cat7 are the most commonly used RJ45 cables in today's network connections.

Cat5 vs Cat5e

Category 5 was originally designed to transmit at 100 MHz frequencies, offering a nominal line speed of 100 Mbit/s. Cat 5 uses two twisted pairs (four contacts) with a maximum range of 100 meters. A Cate5e specification was then introduced with stricter specifications and standards. The new standard also required new cables to include the four twisted pairs.

Over short distances, under ideal signal conditions and assuming they have four pairs, cat5 and cat5e patch cables are capable of transmitting at Gigabit Ethernet speeds.
Gigabit Ethernet uses an optimized encoding scheme specifically designed to operate within these lower signal tolerances.

Cat6 vs Cat6a

Backwards compatible with Cat5e, category 6 has strict standards and significantly improved shielding. The Cat6 cable was designed as the standard for Gigabit Ethernet, offering native speeds of up to 1000 Mbps on a frequency of 250 MHz. By reducing the maximum cable distance from 100 meters to 55 meters, 10 Gigabit Ethernet is supported.

Cat6a doubles the frequency to 500 MHz while continuing to reduce sound interference with grounded sheet shielding. These improvements remove the cable distance penalty when operating in 10 Gigabit Ethernet.

Category 7

Operating at frequencies up to 600 MHz, Cat7 has been specifically designed to support rated speeds of 10 Gigabit Ethernet. In addition to the shielding introduced by Cat6e, this new specification provides individual shielding for each of the four twisted pairs. Cat7 has a maximum distance of 100 meters while maintaining backward compatibility with Cat5 and Cat6. Cat7a increases frequencies to 1000 MHz, providing an augmented specification capable of supporting future 40/100 Gigabit Ethernet speeds. The increase to 1000 MHz also allows the transmission of low-frequency cable TV
Digital terrestrial TV
Two major types of broadcasting exist for television; the so-called analogue and digital television. The analogue television appeared the first. This is widely spread around the world. However, this type of diffusion is ageing and not very innovative.
For this reason analogue television is currently tending to disappear to give way to digital television. Digital television is largely based on analogue televisio......
streams.

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