What's with all the suffixes?
|Standard||Data Rate Mbps||RF GHz||Channels||Range in feet||Comment|
|802.11||2, 1||Non starter|
|802.11a||54, 48, 36, 24, 18, 12, 9, 6||5
(5.725 to 5.850)
|12||Up to 500||High density|
|802.11b||11, 5.5, 2, 1||(2.4 to 2.4835)||3||Up to 1,000||Common|
|802.11g||54, 48, 36, 24, 18, 12, 9, 6,11, 5.5, 2, 1||(2.4 to 2.4835)||3||Up to 1,000||Replacement
data rate and better security
The IEEE ratified the initial 802.11 standard. The initial products sucked big time! No interoperability. Just like modems! Never learn eh!?!
The cost disadvantage of an 802.11a system is not limited to the price of the individual components. Total cost of ownership of an 802.11a system must take into account the number of access points required to cover the network geography.
Range is reduced because it uses the higher 5 GHz frequency band: it's half the range of 108.11b.
More sensitive to obstructions.
802.11b has a theoretical speed of 11 megabits per second. 5 Mbps typical
This is the mature standard running at 2.4 GHz.
Linksys WPC54G Wireless-G - 22 Mbps
Netgear FM-114P winner
Linksys BEFW11S4 second
D-Link DI711 At a distance of 23 meters, this unit still manages a speed of 450 kilobytes per second.
Here's what I ended up with.
Wired Equivalent Privacy (WEP) was added to the 802.11 standard to provide a level of security that was equivalent to the level of physical boundaries on a wired network.
This uses RC4 encryption algorithm between the client and the access point. WEP not only offers privacy, but also adds authentication by requiring an encryption key for access.
Most 802.11b products include it. Enabling WEP will decrease performance.
WEP key format ASCII and Hexadecimal. Some products expect you to know your ASCII table!
SSID (Wireless Network Name)
The ESSID (Extended Service Set ID) defines the access point's network name. Your client machines need to be configured to associate with an access point with that ESSID. Some clients allow a wild card in the ESSID configuration. In this mode, they will associate with the strongest access point, regardless of its ESSID.
MAC address filtering
Response Time as in ping - 1ms - negligible impact.
access points (AP)
Ethernet bridge - probably a required feature
used to be simple:
Access Points had just one mode, which allowed client devices operating in Infrastructure mode to associate (connect) and access the wired LAN to which the Access Point was connected.
new class of products, also capable of wireless bridging. These products, such as Linksys' WET11, and Hawking's WB320, go by different names, but provide the ability to take any device with an Ethernet connector and connect it to a wireless network.
an Access Point is a wireless transceiver that connects a wired LAN with wireless clients.
An AP in its basic form can only connect to wireless clients, and not to another AP.
"Bridge" refers to a device that connects two LANs
Some access points include this feature.
most companies support bridging between their products only
wireless router a AP with DHCP and firewall
The most important thing you need to know about devices of this class is that they cannot act as Access Points! This means that you can't set them to a mode where wireless clients that are set to Infrastructure mode will be able to associate, or connect, to them.
WEB config - default IP may be silly! 192.168.1.254
NETGEAR MA401 (Original Intersil PRISM II based card)
ORiNOCO Gold (Agere Systems chipset)
D-Link DWL-650+ (TI ACX100 chipset)
D-Link's Intersil PRISM GT-based products
NETGEAR WAB501 (Atheros 5100X dual-band chipset)
SNMP - features..
Absolutely dire - just like modems!
SMC wireless AP 2652w Belkin
PC world. Linksys wap + pcmcia card £100
Use good quality cards / dongles. The cheaper ones tend to have poorer receiver performance which reduces their range in noisy environments. Make sure you can attach external antennas to whatever you buy.
Cisco and Lucient/Avayra/Orinoco are IMO the best bets. If you are concerned about bandwidth you may wish to consider 802.11A (Hiperlan 1) - the prices have fallen dramatically over the last year or so.
Make sure you enable security and use a good shared secret on the hub and cards. You may wish to consider using VPN and authentication over the radio link. Assume that anything you transmit can be monitored and that services are available to anyone who has a WLAN card.
I recently say a comparison on receiver performance. Linksys came out badly with their access point having a very poor BER, speed and range in the presence of noise.
Wi-Fi Alliance (formally Wireless Ethernet Compatibility Alliance