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Twisted Pair Overview

Posted on 1st Apr 2016 @ 2:14 PM

Twisted Pair (TP Twisted Pair) is composed of two copper conductors with an insulating protective layer composition. The extent of the two insulated copper wires twisted by a certain density with each other, can reduce signal interference, each conductor radiated in the transmission radio waves will be offset by the other line sent.

By category:common twisted pair has cat 5, cat 5e and cat 6.
By structure:According to the structure can be divided into shielded (STP) and unshielded (UTP) , the shielded is divided into aluminum foil shielded twisted pair (FTP), braided shielded twisted pair (SCTP) and aluminum foil braided double shielded twisted pair (SFTP).
American wire gauge:
commonly used wire gauge: 

Commonly used sheath material:PE,PVC,LSZH
Copper core material: copper core cable common materials are bare copper (BC), copper clad aluminum (CCA) etc. According to the structure is also divided into single strand and multiple strands of two. Cat 5, Cat 5e, Cat 6 and Cat 7 copper cable are both eight-core cable, according to the color is divided into four pairs, which are orange, green, blue, brown. Two cores of each pair twisted with each other by a certain density, the aim is to minimize signal interference. Two core insulation sheath color is a full color, a color is.
Eight core colors are as follows:
Orange white, orange; green white, green; blue white, blue; brown white, brown
Network cable should be used with crimping RJ45 connector, commonly known as crystal head.

Cat5/Cat5e Unshielded Twisted Pair Structure and Technical Parameters

Commonly used conductor:BC or CCA
Gauge: standard 24AWG
Ripcord (also known as cutting rope is twisted by the three strands of nylon yarn, mainly used to tear the outer sheath)
Performance: the main choice of insulation material HDPE high-density polyethylene
Outer sheath (light blue other colors can be customized)
Performance:Conventional polyvinyl chloride (PVC), can also be used as low smoke halogen free flame retardant materials (LSZH) or polyethylene (PE) 
The surface should be smooth, no holes, cracks, bubbles
Minimum average thickness ≥0.5mm
The maximum outer diameter of the cable ≤6.3mm
The outer surface of the sheath should be clear printing

Cat6 Twisted Pair Structure and Technical Parameters


Commonly used conductor:BC or CCA
Gauge: standard 23AWG

Ripcord (also known as cutting rope is twisted by the three strands of nylon yarn, mainly used to tear the outer sheath)
Performance index: the main choice of insulation material HDPE high-density polyethylene
Cross skeleton(Cat 6 Twisted Pair Specific)
Performance: The insulation material should have a transparent LDPE insulation, reducing interference between wire pairs. This is very important, the first to use a line of reduced cross interference on the line, followed by a more cross more tension.
Drain wire (ground wire)
Performance:the drain wire diameter should be not less than 0.5mm
Using TR single round copper wire or tin round copper wire 
Drain wire located within the complex of aluminum foil on one side of the metal surface, if you double shield located between two layers of shielding
Polyester tape (Mylar,located between aluminum foil and twisted pair) 
Performance:waterproof, moisture proof, insulation 

Aluminum foil (conventionally used aluminum foil shield)
Performance:Using single-sided aluminum foil having a thickness ≥0.012mm
In the single-sided aluminum foil for the metal foil should be wrapped, overlapping rate ≥25%
Braided
Performance:Single cylinder circular wire or tinned copper wire (TC with copper)
One way single strand break length is not more than 150mm 
Fill factor shall not be less than 0.41 (braided density of not less than 65%)

Distinction between different categories of cable
1.Distinction between cat5e and cat6 twisted pair


2.Distinction between Cat5e and Cat5 twisted pair