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Difference | Cat6 & Cat5 & Cat7

RJ45 is the electrical interconnection standard that defines the coupler of telecommunications equipment and how the wires are arranged at the end of the cable while Cat6/e/Cat5 is a standard regarding Ethernet cables.

1. What is RJ45 

RJ (registered jack) is the standard physical coupler of telecommunications equipment such as telephone and computer network equipment.  It becames widerspread in computer networking, while some homes do have RJ45 wall outlets, RJ45 coupler can be used for data transmission, but which are often for VoIP phones rather than laptops.

A standardized design covers all the port connections in market is EIA/TIA (Electronic Industries Association/ Telecommunications Industry AssociaTIon).

TIA/EIA-568 ("T568") is a kind of wire sequence used in RJ45 port to connect twisted pair wire. According to the twist degree of copper wire, it can be divided into TIA/EIA-568-A wire sequence and TIA/EIA-568-B wire sequence.

RJ45 keystone jack 2

RJ45 coupler has PC end and network cable is the 8-core male plug which can be explained from RJ45 DTE type pin definition and the RJ45 DCE type pin definition:

  1 TX+Tranceive Data+ 

  2 TX-Tranceive Data- 

  3 RX+Receive Data+ 

  4 n/cNot con nec ted 

  5 n/cNot connected 

  6 RX-Receive Data- 

  7 n/cNot connected 

  8 n/cNot connected

For the whole system, the modularization plays an important role in the stability and scientificity of the whole system. 

2. Development of Cables

Cat6/e/Cat5 is a classification of cables, used for Ethernet network and can be divided from Category1 (Cat1) to the latest Category7 (Cat7).
Among these cables, Cat6a cable can support bandwidth up to 500MHz and transmit data at speeds up to 10Gbps. It can connect to LAN/WAN segments and networking gear at maximum speeds and has been passed the fluke test. 
Compared with standard 23AWG Cat6A cables, it has a thinner Outsider Diameter and its 0.9 meters-length enables you to put it inside your bags easily. CM grade PVC jacket makes it enjoys high elasticity and plasticity. 

cat6 cat6a cable


It’s one which is different from data transmission category. It was mainly used for telephone cables in order to transmit voice before the early 1980s.


Began to transfer data though with a quite low speed at a maximum transmission rate of 4Mbps and used for voice transmission. It is common in the old token network using the 4Mbps standard token transfer protocol.


It specifies in the ANSI and EIA/TIA568 standards. It is used for voice transmission and at a maximum date transmission rate of 10Mbps with the limited transmission frequency is 16MHz.It mainly applies to 10BASE-T, which is the most common form of traditional Ethernet with unshielded twisted pair (UTP) used initially. That’s what we’ll talk about later.

· What are MHz and Mbps?

MHz  - signal oscillations transmitted on the line per unit time, which actually indicates the basic bandwidth of information transmission provided by the transmission medium. This value is constant results from the quality of the wires used, the precise length of each wire and the transmission technology.

Mbps - binary digits transmitted on the line per unit time, which we calls transmission rate. The transmission rate is the ability to transmit information in a specific bandwidth. The encoding method in the network system establishes the connection between MHz and Mbps.


The transmission frequency of this type of cable is 20MHz, which is used for voice transmission and data transmission at a maximum transmission rate of 16Mbps. It is mainly used for token-based LANs and 10BASE-T / 100BASE-T.


This category has increased internal winding density with external high-quality insulation material, allowing 100MHz transmission frequency with maximal 100Mbps.  

Cat5 enhanced (Cat5e): Designed to better support Gigabit Ethernet speeds of up to 1000Mbps by using all four copper wire pairs compared with only two pairs used in Cat5. Cat5e has greatly improved performance with less attenuation, less crosstalk, higher attenuation-to-crosstalk ratio (ACR), higher signal-to-noise ratio (SNR) and smaller delay errors.  

Actually, Cat5 cables are capable of supporting gigabit speeds at shorter distances as well. Because of the combination of affordability and high performance that Ethernet gear offers, Cat5 cable remains the popular choice for most wired local area networks.


The transmission frequency of this category ranges from 1MHz to 250MHz. Cat6 should have a large margin at 200MHz for the comprehensive ACR, which provides 2 times as the bandwidth of Cat5. The transmission rate of Cat6 is much higher than the Cat5, and it is most suitable for applications with transmission rates higher than 1Gbps. Compared with Cat5e, the considerable merit of Cat6 is that it improves the performance in terms of crosstalk and return loss, which is extremely important for new generation full-duplex high-speed network applications.


An improved version of Cat6 which has even better performance than Cat6 in crosstalk, attenuation, and SNR. It is also an unshielded twisted pair cable specified in ANSI / EIA / TIA-568B-2 and ISO Category 6 / E standards. Although its transmission frequency is same as Cat5, it mainly used in 200MHz to 250MHz, and it best applies to a gigabit network with maximal transmission rate of 1000Mbps.

3.Why we need Cat7

Cat7 cable is the latest twisted pair in the ISO Class 7 / F standard. It is mainly used to adapt to the application and development of 10 Gigabit Ethernet technology.It is fit for your home or office network system, mainly adapted to the application and development of 10 Gigabit Ethernet technology, is a shielded twisted pair. Their transmission rate can reach 10Gbps.

However, it is no longer an unshielded twisted pair, but a shielded twisted pair (STP), so its transmission frequency can reach at least 500 MHz, which is more than twice higher than Cat6 and Cat6a, and the transmission rate up to 10Gbps.


- RJ45 is the electrical interconnection standard

while Cat6/e/Cat5 is the cable standard

- RJ45 dictates with what you can use the cable for

while Cat6/e/Cat5 determines how large a bandwidth you have



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