Twisted pair crimp circuit
In that article we looked at the entire crimping process, starting from stripping the wires. In this article we will take a closer look at the most critical stage of twisted pair crimping, namely the crimping circuit. The order in which the conductors should be placed inside the connector raises the most questions and difficulties for inexperienced users. Therefore, it is worth examining this topic again.
As you know, there are four crimping schemes for twisted pair cables. Two crimping schemes for straight cable, and two for crossover. But, do not rush to be afraid of such a variety of circuits; in practice, you will need a maximum of two, and most likely, only one crimping circuit.
Straight cable option No. 1. The most common crimping pattern for straight cable. TIA/EIA-568B standard.
- White-orange
- Orange
- White-green
- Blue
- White-blue
- Green
- White-brown
- Brown
Straight cable option No. 2. A less common straight cable crimping pattern. TIA/EIA-568A standard.
When using this twisted pair crimping scheme, the colors go in the following sequence:
- White-green
- Green
- White-orange
- Blue
- White-blue
- Orange
- White-brown
- Brown
It is necessary to note two very important points that may not be obvious to the inexperienced eye.
- Since this is a straight cable, the order of the conductors is the same on both sides of the cable. If on one side the first contact of the connector is connected to the green conductor, then on the other side of the cable the first contact is also connected to the green conductor. No changes required.
- When placing the conductors, the connector is positioned with the latch facing down.
Crossover cable option #1. For 100 Mbit/s networks.
If you want to get a crossover cable for 100 Mbps networks, then you need to crimp one side of the cable to the TIA/EIA-568B standard and the other to the TIA/EIA-568A standard. Figuratively speaking, a crossover cable for 100 Mbit/s networks is something between the first and second methods of crimping a straight cable.
When using this twisted pair crimping scheme at one end of the cable, the colors go in the following sequence:
- White-orange
- Orange
- White-green
- Blue
- White-blue
- Green
- White-brown
- Brown
And at the second end of the cable the following sequence of colors is used:
- White-green
- Green
- White-orange
- Blue
- White-blue
- Orange
- White-brown
- Brown
Crossover cable option No. 2. For 1000 Mbit/s networks.
For 1000 Mbit/s networks, a different scheme is used to crimp the twisted pair into a crossover cable. In this case, a crimp according to the TIA/EIA-568B standard is used on one side of the cable, that is, like this:
- White-orange
- Orange
- White-green
- Blue
- White-blue
- Green
- White-brown
- Brown
And on the other side of the cable a new color sequence is used, namely:
- White-green
- Green
- White-orange
- White-brown
- Brown
- Orange
- Blue
- White-blue
Conclusions. At first glance, twisted pair crimping circuits are a dark forest that you will never understand. But, as you can see from this article, everything is much simpler.
There are two standards for straight cable crimping, and a crossover cable crimping pattern is the use of both of these circuits simultaneously at different ends of the cable. For 1000 Mbps networks, the crossover cable crimp scheme is a little more complex, but you will probably never need it. Because even a crossover cable for 100 Mbit/s networks is practically no longer used.
Nowadays, all modern network equipment can automatically detect the cable crimping pattern and adapt to it. Thus, the crossover cable has lost its relevance and is currently practically not used. Therefore, if you don’t know which twisted pair crimping scheme to choose, then use the first one (TIA/EIA-568B) and don’t hesitate.
