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to the Internet, we have the Internet Protocol (IP) This protocol allows computers to connect to the Internet, surf the Web, and do all the other stuff that we take for granted on the Internet (eg, checking out the latest on Brad and Jennifer and telling that doofus in Florida that he s all backwards on his Captain Janeway/ Borg Queen theory)
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So what does this all this Internet stuff have to do with Smart Homes Thanks to IP, computers have a common way to communicate, and they don t even need the Internet to do it By using IP, computers in the home LAN can communicate amongst themselves It s a good idea to use IP, especially if you plan on sharing an Internet connection, or just for the sake of sheer simplicity, as IP has become the de facto networking protocol
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The Internet is a huge community of millions of computers holding billions of pages of information and it s only getting bigger and bigger Internet designers had to figure out a way for you to easily find what you want To that end, IP addresses are used These numbers, which you ve probably seen here and there, are four sets of digits separated by decimal points (like 19216811, for example) These are the addresses that the computers in your Smart Home will have to use to be able to connect together in a network
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Every device on your home LAN (indeed on the Internet itself) must have a unique IP address There s no getting around this rule, because IP addressing is what ties your network together IP addresses are 32 bits long and divided into four sections, each 8 bits long (called octets) On the Internet, IP addresses must be unique That is, every network must have its own unique network address and all the devices within it must have their own unique device or host addresses Within a private network like your home LAN your individual devices must still have unique IP addresses, but they need only be unique within your home Consider the two home networks shown in Figure 2-4
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Figure 2-4
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IP addresses on private, home networks need not be unique, except for the routers which connect to the Internet
As the figure shows, devices on the two separate networks can have the same IP addresses the servers can be the same, the printers can be the same, the computers can all be the same, except for the router Since they are private networks and do not interact directly, there is no device conflict Neither LAN is even cognizant of the other s existence The routers, however, will have different IP addresses because they have to interact directly on the Internet However, two computers on the same network, as Figure 2-5 shows, cannot have the same IP address If two devices share the same IP address, there will be a conflict and the device added to the network last will not be recognized
Figure 2-5
Two devices on the same network cannot share an IP address
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We ll talk more about setting up your home LAN in 4
Cabling
There are a number of ways in which components of your Smart Home can be wired together Depending on the application and the needs, you can find yourself using different types of cabling For instance, video signals are best transmitted across coaxial cabling, while computer networks utilize twisted-pair wire This section examines the different types of cabling you re likely to encounter when building and augmenting your Smart Home
Coax
Coaxial cable is the cable you screw into the back of your DVD player and TV If you re like most Americans, you ve probably had a small aneurysm trying to figure out in which way coaxial cable connects between the TV, DVD player, VCR, satellite decoder, TiVo, and so forth Coaxial cable (popularly known as coax cable) is used to transmit radio frequency (RF) signals, such as television and radio signals As Figure 2-6 shows, there are two components on a chunk of coax cable
Figure 2-6
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