Comtest Networks MTAS-192 METALLIC TEST ACCESS SYSTEM - Manual (Page 64)

Comtest Networks CT-IG-MTAS192-2008-v1_8.doc
MTAS-192
58 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).