4. Structured Cabling

Note

Please bring headphones to the lab for this activity.

In this task, you will tour a virtual mock-up of a structured cabling plant in a small building. You will take note of various identifiers in order to ‘make live’ the Work Area Outlet (WAO).

Note that the cabling plant is generally a passive component, but today devices such as patch panels are becoming more intelligent, in order to reduce the cable clutter and reduce electrical noise.

Finally, you will answer some questions about what you have seen and about structured cabling in general. Watch the provided video[7], and record the following identifiers, for use in a cable identification scheme used by Pandiut Corp.

Some things are not shown in the video, but it should be sufficient to give you a good idea.

There are many different cable identification schemes. The scheme you use will depend on the installer and the size of the installation. A work area for example, could be an entire building, or it could be one part of a floor.

A cable can be identified using the identifiers of both its end-points. This is particularly useful when you are putting labels on the cable, which should be done as they are installed.

Assume you have a cable that terminates on Floor 2, telecommunications closet A, rack 1, row 2, port 12. You might identify that end of the cable as 02A-1-2-12. The other end of the cable might terminate at the work area outlet A27 on that floor, and so you might refer to the basic link (the cable between the wall outlet and the patch panel) as 02A-1-2-12/A27. Putting this identifier on both ends of the cable will be useful for maintenance.

Assessment

4.1.

Identify the particular basic link (eg. 02A-1-2-12/A27) that leads to the computer in the video.

4.2.

Although it is not shown in the video, each WAO might have a label identifying the other end of the cable. Why can this be useful? It’s not often done, probably because of the amount of labelling required. How else might this task be accomplished?

4.3.

Describe what might happen when a duplex mismatch occurs: one end of a link is half-duplex, the other full-duplex. Remember that in full-duplex operation, operation can go in both directions simultaneously.

Would a ping test be likely to demonstrate the presence of a duplex mismatch? Why or why not. To help you, consider the network traffic that ping generates. If a ping test would be insufficient describe a test that would detect the presence of a duplex mismatch.



[7] There should be a CD available in the lab, otherwise you can find it from the course webpage.