Page 88 - DCAP311_DCAP607_WIRELESS_NETWORKS

Wireless Networks

Notes z z One or multiple WNICs supporting a part of the IEEE 802.11-standard family also
integrated into the main SoC or as separate chips on the Printed circuit board. It also can be
a distinct card connected over a MiniPCI or MiniPCIe interface.

™ z So far the PHY-Chips for the WNICs are generally distinct chips on the PCB.
Dependent on the mode the WNIC supports, i.e. 1T1R, 2T2R or 3T3R, one WNIC
have up to 3 PHY-Chips connected to it. Each PHY-Chip is connected to a Hirose
U.FL-connector on the PCB. A so called pigtail cable connects the Hirose U.FL
either to a RF connector, in which case the antenna can be changed or directly to the
antenna, in which case it is integrated into the casing. Common are single-band (i.e.
only for 2.4GHz or only for 5GHz) and dual-band (i.e. for 2.4 and 5GHz) antennas.

z z Often an Ethernet Switch supporting Gigabit Ethernet or Fast Ethernet, with support for
IEEE 802.1Q, integrated into the main SoC (MediaTek SoCs) or as separate Chip on the
PCB.

z z Some wireless routers are also include a xDSL-, DOCSIS- oder a LTE-modem in addition
to the other components.
Figure 5.4: Linksys-Wireless-G-Router

Source: http://en.wikipedia.org/wiki/File:Linksys-Wireless-G-Router.jpg
If you don’t have an ADSL connection, but have a cable broadband connection, then don’t buy an
ADSL wireless router. You want one that you can plug your modem in to. Look for any wireless
router that DOESN’T have the words ADSL in the title.

The modem you got from your ISP will probably be connected to your computer via an ethernet
cable. Unfortunately, you can’t just plug this in to your shiny new wireless router and expect it
to work! When you plug your Ethernet cable in to your computer, you’re plugging it in to an
ethernet card. Your ethernet card has a unique address called a MAC address. Cable providers
connect you via the MAC address of your ethernet card. Your new router will have a different
MAC address. So if you plug your ethernet cable in to this, your provider won’t know where you
are, and you won’t get any web pages!
The good news is that there’s something called MAC address spoofing. This is when the router
pretends to be your ethernet card. If you get a wireless router like the Buffalo AirStation G54 High
Power then the install process will take care of this for you. The process will be fairly painless.
The bad news is that some routers expect you to do all this for yourself! The manual will then
explain how to get the MAC address of your ethernet card, and how to enter this information in
to the router. The wireless cable routers we’ve chosen on our recommended pages all have easy
setup options for MAC address spoofing

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