Analyst confirms Siemens' 802.11n claims

05 Mar 2008

Test results by Farpoint Group verify Siemens' claim that its HiPath wireless access points run dual-radio 802.11m functionality within power-over-Ethernet (PoE) limits.

Recently launched Siemens' HiPath AP 3610/3620 access points touted dual-radio, 3x3 MIMO 802.11n functionality while remaining compliant with wattage limitations of industry-standard 802.3af PoE.

At present, two 802.11n radios require around 15watts, more than can be delivered over the IEEE 802.3af standard for powered Ethernet, which cannot go above 12.95watts.

Rival vendors like Aruba and Cisco have come up with various ways such as using shorter cables or fewer antennas without success.

The new HiPath access points can run 802.11n using two concurrent radios - at 2.4GHz and 5GHz simultaneously - consuming just above 12watts, according to Siemens.

The 3x3 MIMO technology for 802.11n relies on the use of six transmitter/receivers (three for each radio), compared with just two for 802.11a/b/g access points.

Depending on the implementation, this additional hardware could consume significantly more power than the 12.95watts that 802.3af PoE is designed to deliver across a 100-meter Ethernet cable.

"We expect Siemens to gain some real market advantage from this for some time," said Craig Mathias of the Farpoint Group, who authored the group's published technical research results.

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