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Black Box Guide to Structured Cabling

Section NameSection Name

Cabling

The importance of cable

Cabling is one of the most important components of your network and is the most

long-lived with an expected life span of 15–20 years. You’ll most likely replace your

network equipment three to four times over the life of the cabling system. Plan on

cabling to be about 15% of your total network cost. And don’t skimp on the cable

or the installation. An investment in a high-quality cabling system is easily justified

in reduced downtime, reduced maintenance, and better network performance.

So think long-term and buy the best cable and installation services.

Cabling considerations.

Network application. The type of network you

plan to run will influence the cable you choose.

Upgrades. Anticipate changes and upgrades

in equipment and applications.

Life span. Expect 10 years minimum and 20 years

maximum.

Distance. Review the maximum distance between

your network switches and the farthest desktop.

Cable routing. Consider bend radius and available

space for running cables in the floor and ceiling.

Fire risk. Abide by all regulations.

Existing cable. Is there existing or abandoned

cable that needs to be removed?

EMI (electromagnetic interference). Don’t forget

to check for it.

Environment. Any physical limitations that could

affect your cable choice?

Choosing cable.

When planning your cabling infrastructure, you

have two basic choices: copper or fiber. Both offer

superior data transmission. The decision on which

one to use depends on your current network, your

future networking needs, and your applications,

including bandwidth, distances, environment, cost,

and more.

Traditionally, copper was used in lower-speed,

short-distance networks, and fiber was used in

higher-speed, long-distance networks. But with the

advent of copper cable running at 10-Gigabit rates,

this maxim no longer holds true. You may even find

a mixed network with a fiber backbone and copper

horizontal cable to be an optimum solution.

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