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How to connect the network cables and what is their color order?

Jun 15, 2022
How to connect the network cables and what is their color order?
In the last article, we discussed in detail the differences between RJ9, RJ10, RJ11, RJ12, RJ14, RJ22, RJ25, RJ45, RJ48. Now, we will talk about how to connect the network cables and what is their color order

RJ9, RJ10, RJ22
RJ9 is actually at times denoted as the RJ10 or RJ22. so RJ9=RJ10=RJ22 , they are typically terminated on 4 conductor curly phone cable and used to connect a telephone handset to a telephone receiver, they have a unique configuration type, It has the least number of positions(4 Positions). Hence, it is the smallest among the registered jacks.
 
Position Pin Description Color Code Sketch Map
1 T0+ Transmit 0+ Black
2 R0- Receive 0- Red
3 R1+ Receive 1+ Green
4 T1- Transmit 1- Yellow


RJ11
RJ11 comes under the category of 6P4C modular connectors. It is slightly larger than RJ9/RJ10/RJ22. These connectors transmit audio and control signals. They connect the telephone to the Public Switched Telephone Network (PSTN) networks. They are also used in Asymmetric Digital Subscriber Line (ADSL) and modem connections.

The 4 wires are utilized as two pairs. Thus RJ11 can make two connections to connect with two telephone lines. Usually, one pair is used and the other is kept as extra.
 
Position Pin RJ11 Color Code Sketch Map
1 Transmit + Unused /
2 Transmit + T2 Black
3 Receive - R1 Red
4 Transmit + T1 Green
5 Receive - R2 Yellow
6 Receive - Unused /


RJ12
RJ12 is a 6P6C connector. It has 6 positions and 6 wires. Thus the only difference between RJ12 and RJ11 is that RJ12 has two more wires. Since the number of positions is the same, the size of RJ12 and RJ11 is also the same.

RJ12 can make 3 connections with the available 3 pairs of wires. RJ12 is mainly used for system phones. It can also be used in place of an RJ11 connector. But the reverse is not possible since RJ11 can only make two connections as opposed to the three connections of RJ12.

 
Position Pin RJ12 Color Code Sketch Map
1 Transmit + T3 White or orange
2 Transmit + T2 Black
3 Receive - R1 Red
4 Transmit + T1 Green
5 Receive - R2 Yellow
6 Receive - R3 Blue or Brown

RJ45

RJ45 is a well-known connector and is widely used for Ethernet and data connections. Hence they are also known as Ethernet connectors. It is an 8P8C connector.

With the larger number of positions, RJ45 is slightly larger than RJ12. RJ45 terminates the coaxial cables of Cat6 and Cat5e standards.

The pinout of RJ45 is given below.

Straight cable pinout:


Crossover cable pinout:

 

RJ48

RJ48 is also an 8P8C connector that has a good similarity with RJ45. But both the connectors are not the same.

Although RJ48 is used in the networking sector, it is specifically used to terminate T1 and ISDN networks. Another advantage of RJ48 over RJ45 is that it can be used for longer-distance communications.

RJ48 is used to terminate Shielded-Twisted Pair (STP) cables. It is available in different variants such as RJ48C, RJ48X, and RJ48S.

RJ48 pin combination is 1,2,7,8 or 1,2,4,5. The pinout of RJ48 is given below:

RJ48 Pinout and Color code description:


 

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