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wireles network hacks mods - briere D.

briere D. wireles network hacks mods - Wiley publishing, 2005. - 387 p.
ISBN: 0-7645-9583-0
Download (direct link): wirelesnetworkhacks.pdf
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The big advantage of this network architecture (for you as a customer) is that it can carry a lot of data across it — more than just plain phone wires, though not as much as an all-fiber network.
Speed: For most folks (at least for the unlucky majority who haven’t yet got FTTH), cable is the fastest broadband connection to the home. Typical cable modem connections offer speeds of 5 Mbps downstream, and somewhere between 128 Kbps and 1 Mbps upstream. If you’re willing to pay more for a “business” connection, you can expect to double those speeds. Expect these speeds to increase over time as cable continually uses speed to maintain an advantage over DSL.
Price: The added speed of cable modem services (compared to DSL) comes at a price — most cable modem services start at about $45 a month. The cable companies have made a conscious decision to not stake out the low price segment of the market, and instead are trying to offer a premium product (higher speeds, mainly) for a bit more money. Business-grade cable modem services cost about twice that amount.
Availability: If you have cable TV service available at your home, chances are good that you can get cable modem service. According to the NCTA (National Cable & Telecommunications Association, the cable companies’ trade group), 88 percent of homes passed by cable can get digital cable services such as cable modem high-speed Internet.
Chapter 4: Wi-Fi and Broadband Connections
Networkability: Most cable modem services offer users an Ethernet interface with a dynamic IP address — you’ll typically not need to use PPPoE or any kind of login. With a business class connection, you can upgrade to a fixed IP address and also get support for hosting your own servers on your wireless network (something that many residential cable modem services do not allow).
For many folks, cable modems offer the best combination of price and performance, offering a good bit more speed than DSL for only ten bucks a month more. The DSL providers are not unaware of this situation, however, and are going forward with new technologies (as we described in the “Fiber comes home” sidebar) to catch up with and even push ahead of cable. It promises to be a fun few years as the cable companies and phone companies strive to one-up each other.
Getting the dish out on satellite and wireless
For some folks, particularly those who live “off the grid” — or at least outside of the cities and suburbs — cable modems and DSL simply are not options. Homes may be too far from central offices and cable company “headends,” or simply too geographically dispersed to make broadband services profitable for telephone or cable companies. The number of people who fall into this category is shrinking every year, but will probably not get to zero for quite some time. (After all, a few tiny pockets of rural areas still haven’t got telephones yet — after more than a hundred years of that service!)
For these folks, the best option is to look to the airwaves to find a wireless broadband source to feed their wireless networks! The most common and widely available wireless broadband service uses satellite dishes — the same basic kinds of dishes used for DIRECTV and Dish Network TV services. In this
UDP, UDP, what's UDP?
Remember the old song that goes, "You don't know what you've got 'til it's gone?" Danny thought of that first when his cable modem provider turned off UDP on his cable modem network. UDP (User Datagram Protocol) is a protocol that runs on your network; lots of programs use this protocol to do things, such as anti-virus software that uses UDP to check for upgrades. However, UDP is also used by some
computer viruses to spread themselves, and that's why Danny's ISP turned it off. If you've ever used PING or TRACERT commands at a command prompt in Windows, you've used a UDP-based service. Without UDP, you can't do these services. So ask if UDP traffic is blocked on your intended broadband network. Not having this protocol available is a real pain.
68 Part I: Making Your World Wireless
section, we talk about satellite broadband — in the next section, we discuss some wireless options that are a bit closer to earth (using terrestrial antennas instead of satellites).
The folks at DIRECTV have put together a service called DIRECWAY (formerly known as DIRECPC) that can offer (relatively) high-speed Internet access over satellite dishes. Here’s how DIRECWAY measures up:
Speed: DIRECWAY service is considerably slower than DSL or cable modem, with a maximum downstream speed of 500 Kbps, and a maximum upstream speed of 50 Kbps. This pales in comparison to cable or DSL, but is considerably better than dial-up for many users. The biggest issue with DIRECWAY isn’t the speed, but rather the latency, or delay, in the system. The trip up to the satellite and back down takes a long time, even at the speed of light, meaning that VoIP phone calls or online games won’t work too well with this system.
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