An Installation Pocket Reference Guide.pdf - Anixter
An Installation Pocket Reference Guide.pdf - Anixter
An Installation Pocket Reference Guide.pdf - Anixter
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|3. Twisted-Pair Cable<br />
SECTION 3: TWISTED-PAIR CABLE<br />
Twisted-Pair Cable<br />
Twisted-pair cable consists of two insulated copper wires twisted around each<br />
other with neighboring pairs in a bundle typically having different twist lengths,<br />
between 5 and 15 cm, to reduce crosstalk or electromagnetic induction.<br />
The conductor insulation and overall jacketing of the cable can utilize various<br />
shielded or unshielded elements. The ISO/IEC 11801 cable designations are<br />
noted in the following figures.<br />
8-conductor/4-pair twisted-pair cable is generally used in horizontal applications<br />
from telecommunication closets to a workstation or desk. A multipair twisted-pair<br />
cable is generally used in intra- or inter-building backbones.<br />
U/UTP<br />
Cable Sheath<br />
Pair<br />
Conductor<br />
F/UTP<br />
Cable Sheath<br />
Foil Screen<br />
Pair<br />
Conductor<br />
U/FTP<br />
Cable Sheath<br />
Foil Pair Screen<br />
Pair<br />
Conductor<br />
<strong>Guide</strong> to understand twisted-pair cabling types abbreviations<br />
Balanced element<br />
Element screen<br />
Overall screen<br />
TP = Twisted pair<br />
U = Unscreened<br />
F = Foil screened<br />
F = Foil screened<br />
S = Braid screen<br />
SF = Braid and foil screen<br />
SF/UTP<br />
Cable Sheath<br />
Braid Screen<br />
Foil Screen<br />
Pair<br />
Conductor<br />
S/FTP<br />
Cable Sheath<br />
Braid Screen<br />
Foil Pair Screen<br />
Pair<br />
Conductor<br />
Figure 3.1 – Twisted-Pair Cabling Types<br />
|22 1.800.ANIXTER
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