802.11h

Extensions to the physical layer of 802.11 for regulatory compliance in Europe in the 5 GHz band (802.11a). To coexist with signals from licensed carriers, 802.11h adds Transmit Power Control (TPC) and Dynamic Frequency Selection (DFS). These functions enable 802.11 devices to "listen" before transmitting so that they can adjust their power and change channels as required.

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References in periodicals archive

Amp'ed RF Wi-Fi IC (ACC1340) unlocks 802.11h DFS through hardware and embedded software.

Amp'ed RF unlocks dynamic frequency selection

We are proud to be enabling this wireless ecosystem by supporting the Wi-Fi Direct standard in our Avastar family and by working with device manufacturers to help them deliver a new generation of mobile devices to consumers worldwide." Key features of Marvell's Avastar 88W8787 includes: support up to 150Mbps bit rate over the air with 40 MHz channels in both bands, best-in-class leakage current with up to 4x lower than existing solutions and 802.11h Dynamic Frequency Selection (DFS) for detecting radar pulses when operating in the 5 GHz range.

MARVELL AVSTER 88W8787 ACHIEVES DUAL-BAND 802.11N WI-FI DIRECT

WIRELESS STANDARDS Data Throughput Data Throughput Standard (Theoretical Speed) (Practical Speed) 802.11 Up to 2 Mbps 1 Mbps 802.11b 11 Mbps 6 Mbps 802.11g** 54 Mbps 27 Mbps (g-only networks) 9-13 (b/g combination networks) 802.11a 54 Mbps 27 Mbps 802.11 super a + g 108 Mbps 54 Mbps 802.11h 54 Mbps 27 Mbps Standard Frequency Band High Interference 802.11 2.4-2.4835 Ghz Yes* 802.11b 2.4-2.4835 Ghz Yes 802.11g** 2.4-2.4835 Ghz Yes 802.11a 5.12-5.25 Ghz No 5.47-5.725 Ghz 5.725-5.825 Ghz 802.11 super a + g 2.4 GHz 802.11 b/g No or dual band 2.4/ 5 GHz 802.11 a/b/g 802.11h Same as 802.11a No *Since 2.4 GHz has only three non-overlapping channels, users may share this frequency with their neighbors' wireless networks or other wireless devices, such as cordless phones and microwave ovens.

Wireless networks and security issues

* Standard-based: Support for 802.11 a/b/g and emerging 802.11i and worldwide 802.11h standard

SYMBOL INTRODUCES NEW WI-FI PRODUCTS

With bursting, 802.11g clients send several 54-Mbps packets in succession-in about the time it takes an 802.11h client to send one 11-Mbps packet.

The role of industry standards

5GHz, a dedicated band for WLANs, up to 54 Mbps, fast enough for streaming multimedia, similar to 802.11h European standard

Pulling the plug: thanks to 802.11b, educators are awash in wireless networking products. Is this a standard schools should embrace, or is something better just around the corner? (Cover Story)

* decide on a potential upgrade from lower-speed 802.11h to 802.11a or 802.11g networks.

Test parameters for VoWLAN