Telecom Cables
 Cabling
and fiber designed specifically for telecommunication applications
vary depending on the distance and volume of voice channels to be
carried.
Home or Office
Commonly Unshielded Twisted
Pair (UTP) cabling is used in the home or office. Each pair
can be used for an analogue or digital telephone handset (sometimes
analogue requires a third cable), referred to as the "ring"
and the "tap". The pair not only carries full-duplex audio
but also provides a minimal 50 volt power supply for the phone handset.
In an office, bulk cables are used that may carry as many as 50
twisted pairs.
Telegraph and Underground Cables
Groups of pairs are usually transported underground
or by telegraph using bulk Shielded
Twisted Pair (STP) cabling to connect homes and offices to Phone
Connection Point (PCP) boxes located in public areas. These connect
individual telephone lines to the local loop and exchange, allowing
voice information to be switched between other lines.
New telephone and cable operators are moving over
to local fibre loops, preferring to end the twisted pair cabling
at the PCP or even on the premises where the telephone lines are
located.
International Voice Transit
Transit of voice and data over long distances
and under the ocean require a reliable, high-capacity method of
communication. Fibre optic cabling
is the most efficient way of connecting countries, and almost all
international voice and data travels through these fibre links.
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for suppliers of network cables, cable companies and network
structured cabling in the UK, France, Germany and Spain
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