The Fundamentals Of Structured Cabling

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By Rosa Wade


Knowing how to read a blueprint is one of the most important things that a structured cabling installer first needs to know. It doesn't matter if the installation job is for a home or a small or large business. The entire job is dictated by what is on the blueprint.

What you want to do is identify where the individual jacks are going to be located. Many plans use triangles pointing to the walls. One of the other things you want to identify is where the Main Distribution Frame is going to be located. This is usually where the phone system and patch panel are going to be.

This is important because this is where all the data and phone systems are going to be connected. In smaller businesses this is usually found in a smaller room or closet outside of the office. But in larger offices or buildings this distribution point is located somewhere in the center of the office. There are two main reasons for this. The first being that it will be much easier to run the cables to the desired locations. Second and more importantly, there is a limitation of how long the loop of the wire can be.

Lets get back to the distribution point. This is the heart of the telecommunication network. The entire network comes together here in this area. In other words all those jack locations pictured on the blueprint will run from here to there. The proper way for running any type of wire is to place all the boxes of the cables here and pull it from the jack locations. This is done by using a pull string normally run through the ceiling.

It's a simple process of tying one end of the string to both the telephone and data cables together in the distribution point and start pulling. It is also a good idea to leave an extra pull string or two just in case the customer may want additional locations installed later on. It will save the installer a lot of time with any future installations.

Industry standards usually call for two color coded CAT5E cables. One is blue which is used for computers and data circuits and a white colored cable normally used for POTS lines. But be advised that you need to be sure that you can use CAT5 cables in your projects because some local building codes may not allow it.

So once the installation is complete the installer will start attaching the cables to a rack that is in the distribution point. On this rack is where a panel will be installed to connect up the blue data cables. Normally on a wooden board there will be a few punch on blocks called RJ's. These blocks are used to terminated the white cables that will be used for the phone system. The installer will then run cross connects to provide service to the phone stations. So as you can see being able to read a blueprint will make the structured cabling job a lot easier.




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