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If you want more than one phone line for your Smart Home, we ll talk about some different options for adding multiline phones to the house Next, we ll explain how to install phone jacks and discuss some of the issues surrounding telephone wiring The chapter rounds out with a discussion of connecting your telephone system to a home automation or security system
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Types of Phones
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There used to be a time when telephone users were tethered to the phones, as the phones were tethered to the wall Of course, there also used to be a time when you d have to ask Mabel to ring up Klondike 227, but no one does that anymore, either While wired phones are still prevalent (and cheap you can get one for less than US$10), there have been great strides in the field of wireless telephony In this section, we ll examine not only wireless telephones and how to buy one for your Smart Home, but also wireless phone jacks These devices make it easy to connect a jack in locations that might not normally be conducive for phone jacks We ll also talk about multiline systems that make it possible for several people to use the phone at the same time a must if you have teenagers
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Wireless technology has made great leaps and bounds in the past two decades More people have wireless telephones than before, and they work better than ever This section is a quick primer on wireless technology, so you have a better grip on these appliances and their features when you go shopping for one
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Wireless telephones (also widely referred to as cordless telephones) are comprised of two parts:
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Base This is the unit that attaches to the phone jack The base
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receives the incoming call through the telephone line; converts it to an FM radio signal; then broadcasts that signal, which is picked up by the handset
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Handset This is the unit that is mobile and receives signals from
the base It converts the incoming broadcast to an electrical signal, which is sent to the handset s speaker When you speak into the
Smart Home Communication Systems
handset, the sound is converted to an FM radio signal broadcast, then received by the base and converted into an electrical signal, and finally sent back across the telephone line The base and handset operate on a frequency pair that allows you to talk and listen at the same time This is known as a duplex frequency For example, Table 12-1 illustrates how duplex frequency could be used on a given cordless telephone
Base Handset Table 12-1
Duplex Frequency Example
90138 MHz 90322 MHz 90322 MHz 90138 MHz
Transmitter Receiver Transmitter Receiver
As the table shows, two frequencies are used between both devices each frequency serves as a transmit frequency on one device and a receive frequency on the other Cordless phones have been around since the early 1980s and started with an operating frequency of 27 MHz As revolutionary as this was, there were still inherent problems, including a limited range, crummy sound quality, and awful security (anyone with another cordless phone could listen to your conversation) In 1986, the Federal Communications Commission allowed cordless phones to use the frequency range between 47 and 49 MHz In 1990, the FCC allowed the use of the 900-MHz band This ameliorated problems of clarity, crowding, and range In 1998, the FCC opened up the 24-GHz range, which increased, again, the range over which cordless phones can operate and also brought it out of the frequency range of most radio scanners which improves security and stymies that dork with the scanner down the road who holds his glasses together with tape and knows everyone s business Additionally, as cordless telephones have evolved, they have added improved encoding techniques, which keep prying ears from listening in on a conversation Cordless telephones have as many features as a new car The phone you select will depend largely on the features you want Table 12-2 lists some of the more common features on modern cordless phones