Common Connector Types
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- čas přidán 5. 07. 2024
- In this video for ITFreeTraining, I will go through the common connector types that you are required to know for the CompTIA exam. Many IT departments have piles of assorted cables. Being able to recognize a connector quickly will allow you to find what you are after quickly, or you could just tidy up the cables!
Download the PDF handout: itfreetraining.com/handouts/ap...
Connectors Covered in This Video
0:19 In this video, I will look at the following connectors. These connectors are primarily used for data transfer. Not all connectors are covered, for example, fibre connectors as they will be covered in later videos. This video will cover the more common connectors that you are likely to come across.
Registered Jack (RJ)
0:36 The first connector that I will look at is the registered jack or RJ. The RJ is a standardized telecommunication network interface used for voice and data equipment. The first connection I will look at is the RJ11.
The RJ11 connector has a six-pin connector allowing for six wires. You can see in this example that two wires are in use. This is true to the RJ11 standard. If you used four wires this would be called RJ14 and six wires would be RJ25.
In computing, you will most likely hear this sized connector referred to as RJ11 regardless of how many wires are used. For the CompTIA exam you only need to know that it is the RJ11 connector. If you ever get a job in telecommunications you may need to know the others, but within computing, if you see this connector, regardless of how many wires it is using, no one will criticize you for calling it an RJ11 connector, simply because everyone in the IT industry is so used to referring to it as RJ11.
The next connector that I will look at is the RJ45 connector. The connector used for the RJ45 has eight pins making it slightly larger than the RJ11 connector. Technically, the connector we use in computing is not the true RJ45 connector. However, like the RJ11 connector, it is a de-facto standard, so no one will blink an eye if you call it that; in fact they will be expecting you to refer to it by that name. I won’t go into much detail about why it is not a true RJ45 connector because, in IT, you just need to know that a connector that looks like this is an RJ45 connector.
In some cases, you will see an RJ45 cable like the one shown which only has two pairs of wires making a total of four wires. For networking you only need two pairs of wires, one for sending and one for receiving.
Looking at these cables side by side illustrates an important point. Notice that with the RJ45 cable, one of the wires is connected away from the others. This is done so the RJ11 wires occupy different positions to the RJ45 wires.
To illustrate this better, notice that if I have a standard network socket, I can plug the RJ11 cable into a standard network plug. Since the RJ11 pair is separated from the two pairs used for networking this won’t cause any issues. If I want to swap the cable, I can just unplug the RJ11 and plug in the RJ45 cable. Both connectors will work in the same plug without issue.
You will find that older telephones will use the RJ11 connector. These will be plugged into RJ45 network sockets and run over RJ45 cables back to the network cabinet. Since the RJ11 pairs are separate from the two pairs for networking this will not cause any problems.
Generally speaking, a standard network cable will use four pairs for a total of eight wires as shown in this example. You can’t tell that one of the pairs has been separated by looking at the cable; however, this becomes important if you start crimping your own cables. Crimping is the process of attaching a connector to a cable. When crimping cables, it is important to ensure all the wires are connected correctly. I will cover how to do this in a later video.
In the real world, the vast majority of network cables will have all eight pins connected. The extra four wires are generally not used, although in some cases they may be. For example, if power over ethernet is used, the extra pairs can be used to carry power to the device they are connecting. This eliminates the need to have power installed where the device is. This is often used for wireless devices where installing them may be impractical or expensive to run power cables to.
Description to long for CZcams. Please see the following link for the rest of the description itfreetraining.com/ap/1c80
References
“Registered jack” en.wikipedia.org/wiki/Registe...
“RS-232” en.wikipedia.org/wiki/RS-232
“BNC connector” en.wikipedia.org/wiki/BNC_con...
“USB” en.wikipedia.org/wiki/USB
“Lightning (connector)” en.wikipedia.org/wiki/Lightni...)
“Molex connector” en.wikipedia.org/wiki/Molex_c...
Credits
Trainer: Austin Mason ITFreeTraining.com
Voice Talent: HP Lewis hplewis.com
Quality Assurance: Brett Batson www.pbb-proofreading.uk
Thank in millions for sharing your rich knowledge on this platform, God bless you.
So nice of you
Awsome video. Just to add some info: using 8 wires in a RJ-45 connector may also means that you are going to use such a cable in 1000Base-T Ethernet (and up) scenarios: DA,DB,DC, DD. For 100Base-TX situations only 4 wires (of the 8 avaliable) are acually used.
Knowledge ka bhander means you're knowledge very very genuine 😊 thanks for uploading a videos for our help 🌹
Thanks for watching.
You missed PS/2, not to mention Firewire/i.Link, and it's replacement - Thunderbolt.
Also, I was wondering why you left out display connectors.
We have whole video on those content common out since there is so much to discuss. However, the PS/2 we should have included in this video, so nice pick up pointing that out.
Hi to Itfreetraining team! Would you guys please publish some linux tutorials? That'd be great!!
Best wishes and a happy new year 2021 :)
We don't have any current plans, but maybe one day.
10:07 the keyboard must be the host and the tablet must be the hist device so you can control the tablet or write command to it , if not why would i bother plugging keyboard to tablet? Am I wrong?
Nice
Thanks for watching.
BNC (Bayonet Neill-Concelman)
Thanks for pointing that out.
I came to find if someone had pointed out this fault.
👍🌹
Thanks for watching.
What's the meaning of NO BEEP SOUND? When post testing motherboard?
Mine never beeps, just works. If you've got a fault, but no beep, then get a PCI POST card. That will tell you the issue unless your PSU is down.
If the system is working, no beeps means the speaker is broken or not connected. Some BIOS, will also have an option to switch the start up beeps off so that may have also occurred.
Where i get this connectors?
These connectors are used on a lot of standard cables. Thus come with the cable.
I thought BNC stood for Bayonet Neill-Concelman
You are correct. The smaller BNC is the baby one not the standard one we showed. We will get the video corrected. Thanks for letting us know.