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In the center is a piece of copper wire that is surrounded by an insulating material This is then enclosed by a mesh shield Finally, this is all encased in a final insulating layer Note that coaxial cable is believed to have been invented in Germany in 1884 by Ernst Werner von Siemens At the time, there was no known application for it Comparison There are two major types of coaxial cable used in homes:
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RG-59 In most video installations, you ll find this grade of coaxial
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cable This is usable but not ideal for video networks, cable, and satellite TV connections
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RG-6 This is the highest grade and quality of coax cable It offers
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the best protection from interference and is best for your video distribution needs RG-6 is thicker and heavier than RG-59 cabling,
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but it offers less signal loss at higher and lower frequencies, which is especially important when connecting to digital cable or satellite applications The big difference between RG-59 and RG-6 cabling is a matter of signal quality and the cabling s ability Basically, RG-6 cable is capable of carrying video signals cleaner for much further differences Naturally, that comes with a cost, but only a small one 1,000 feet of RG-59 coax cable costs about US$8999, while the same length of RG-6 cable costs about US$10999 Making the Connection To connect your coax cables to various devices, one uses an F connector An F connector comes in male or female versions The female connector is the type seen on the back of your television or DVD player, and the male connector is the type that screws or plugs in to your coax-connected component Figure 2-7 shows an F connector
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Figure 2-7
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Coax cable with an F connector
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Twisted Pair
You use twisted-pair cabling every day, but the name might not pop out and bonk you on the head The general category twisted-pair is used for both telephone and computer networks It is simply pairs of wires twisted together and encased in an insulating sheath Twisted-pair cable is used for a number of Smart Home functions The cabling is usually 22 or 24 gauge, depending on the function It is used for
Security systems and sensors Speaker wire HVAC systems A/V controls Computer networks Telephones
2
Twisted-pair wire comes with different numbers of wires, depending on the type you buy The number of wires in the cable will depend on how many systems you need to connect Twisted pair comes in two flavors:
STP (shielded twisted pair) A two-pair cabling medium encased
in shielded insulation to limit electromagnetic interference of signals
UTP (unshielded twisted pair) A four-pair cabling medium not
encased in shielding UTP is used in most computer networks
Shielded vs Unshielded
The more tightly twisted the copper wire strands, the less likely there will be interference or signal loss STP has only two twisted pairs, but compensates with its shielding UTP has no shielding, but compensates with an extra pair of wires Because UTP is fast, reliable, and inexpensive, it has become the predominant type of cabling used in computer networking Use of the more expensive STP is limited to environments made hostile by high levels of electromagnetic interference this probably won t be your home unless you live by an electromagnet factory Figure 2-8 shows some strands of twisted-pair cable
Figure 2-8
Twisted-pair cable
Cabling Specifications Table 2-1 explains the five categories of unshielded twisted pair specified by an international standards organization called TIA/EIA
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(Telecommunications Industry Association/Electronics Industry Association) These cabling specifications are important in that the rate at which data can be reliably transmitted is determined by a combination of factors:
How tightly twisted the copper wire is The quality of the cable s copper The type of insulation used to encase the cable The design and quality of the cable connectors
In Table 2-1, Cat 3 and 5 represent the lion s share of twisted-pair networks today Cat 3 is predominantly used for telephone networks and security systems, while Cat 5 has the lock on computer networks
Category
Cat 1 Cat 2 Cat 3 Cat 4 Cat 5
Cable Description
Traditional telephone cable Four twisted pairs Four twisted pairs with three twists per foot, rated up to 16 MHz Four twisted pairs, rated up to 20 MHz Four twisted pairs with eight twists per foot, rated up to 100 MHz
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