Chapter 2 Specifications
9
Remark
1) UTP : Unshielded Twisted Paired Copper Cable
FTP : (Overall) Foiled Twisted Paired Copper Cable
STP : (Overall) Shielded (and Shielded Individually Pair) Twisted Paired Copper Cable
2) Patch Cable (or Patch Cord)
Stranded conductor composed of stranded cable instead of solid conductor may be used to increase the
flexibility of UTP 4-paired cable. Representative specification and material are un-coated AWG 24
(7/0203A).
In other words, the diameter of a single cable is 0.203mm, and this cable is of 1+6 structure as
standardized with annealed copper cable.
2.3.2 Frequency classification
Classification Frequency (MHz)
Transmission speed
(Mbps)
Purpose
Category 1 Phonetic frequency 1
ㆍ Phone network (2-Pair)
Category 2 4 4
ㆍ Multi-Pair communication cable
Category 3 16 16
ㆍ Phone network + computer network
Category 4 20 20
ㆍ Computer network transmission
speed up
ㆍ Low- loss communication cable
Category 5 &
Enhanced Category5
100 100
ㆍ Digital phone network + computer
network
ㆍ Low -loss, broadband cable
[Table 2-4] Frequency classification
Remark
1) Presently classified items are Category 3, 5, Enhanced Category 5 and Category 6 inside and outside of the
country, where Category 4 has been replaced by Category 5 and Category 7 is being under development all
over the world as STP structure.
-UTP- -STP-
-FTP-
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