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Specialized Network Options 283<br />
Point-to-Point Wireless Networks<br />
Each wireless client sends its signal directly to the receiving client.<br />
This is much slower, but also much simpler <strong>and</strong> less expensive than<br />
star-topology wireless LANs. The following st<strong>and</strong>ards use a pointto-point<br />
topology:<br />
• HomeRF—HomeRF is a home-oriented network st<strong>and</strong>ard<br />
that runs at just 1.6Mbps currently, but future versions will<br />
run at 10Mbps. It also can be connected to st<strong>and</strong>ard Ethernet<br />
networks by means of a wireless bridge. HomeRF products<br />
running at 1.6Mbps are available now.<br />
• Bluetooth—Bluetooth is a very short-range, slow-speed<br />
(<strong>400</strong>Kbps) st<strong>and</strong>ard primarily designed for data interchange<br />
between appliance devices, such as pagers, PDAs, <strong>and</strong> wireless<br />
phones, as well as notebook computers. Bluetooth-enabled<br />
devices should become available in late 2000.<br />
Both HomeRF <strong>and</strong> Bluetooth use the same 2.4GHz frequency as IEEE<br />
802.11b, so interference between these types of networks is possible.<br />
Table 11.12 provides an overview of the various wireless network<br />
st<strong>and</strong>ards currently in use.<br />
Table 11.12 Comparison of Current Wireless Networks<br />
Connects Maximum<br />
with Number of Average<br />
Rated Logical 10BASE-T <strong>PCs</strong> per Cost per<br />
Network Speed Topology Ethernet via Access Point User5 IEEE 802.11b 11Mbps Logical Star Access point Varies by $5251,2 (requires br<strong>and</strong> <strong>and</strong><br />
access point) model; up to<br />
2048<br />
RadioLAN 10Mbps3 Logical Star Wireless 128 $6002 (requires BackboneLINK<br />
access point) (access<br />
point)<br />
HomeRF4 1.6Mbps Point-to- Symphony 10 $139<br />
Point Cordless<br />
Ethernet<br />
Bridge<br />
1. Average price of products from Cisco, Lucent, <strong>and</strong> 3Com as of 2000.<br />
2. Price includes access point (required).<br />
3. Actual throughput of RadioLAN compared to average of IEEE 802.11b products is about 25%<br />
faster due to higher radio frequency used.<br />
4. Figures for Proxim Symphony, first HomeRF product available.<br />
5. Average cost per user based on a four-station network with two PCI desktop <strong>and</strong> two notebook<br />
<strong>PCs</strong> <strong>and</strong> one access point (if needed).
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