Comtest-networks MTAS-192 METALLIC TEST ACCESS SYSTEM Uživatelský manuál stáhnout pdf (Strana 64)

Comtest Networks

CT-IG-MTAS192-2008-v1_8.doc

MTAS-192

Installation Guide May 2008

Solid category 5 (or CAT5) cable is recommended for:

• all horizontal runs

• runs between wiring closets

• runs over 25 feet

• runs less than 328 feet or 100 meters (the maximum recommended length)

• applications in which the cable is not flexed.

Stranded category 5 (or CAT5) cable is recommended for:

• applications that may involve repeated flexing of the cable (stranded cable is built

to withstand repeated flexing without damage to inner conductors)

• PC-to-wallplate applications

• short runs of 25 feet or less (due to the higher attenuation associated with

stranded cabling).

NOTE: In addition to choosing between stranded and solid CAT5 cabling, be sure to

determine whether plenum-rated or non-plenum-rated cable is required for your

particular application. Plenum-rated cable has a special outer jacket and is generally

required in all air returns, dropped ceilings, and public buildings. As fire codes vary

from area to area, be sure to check with your local Fire Marshall.

E.4. Common Causes of Cable Failure

Table 25 shows a list of cabling mistakes that are often the cause of cable failures.

Table 25: Common Causes of Cable Failure

Problem Solution

Modular plugs are not

terminated properly

• Use the right type of plug (stranded vs. solid conductor).

• Follow the appropriate color code.

Pair-twists are not

maintained

• Add an additional twist to the pair (if needed) when

terminating the modular jack to ensure that the cutter on

the termination tool is facing the right direction.

Too much cable

jacketing is removed

• Keep the cable jacket intact up to the connector.

• Remove only enough of the jacket to terminate the pairs.

Poor cable routing

• Keep cables separate from power and other

telecommunications cabling.

• Do not exceed 25 lbs of tension on cables being pulled.

• Avoid cable twisting.

• Avoid friction and “rubs” between the cable and other

items (e.g., nails, screws, and even poorly drilled joists

and studs).

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