Re: Regulatory Alert - anyone's still using 802.11a?

info_at_cabling-design_dot_com@xxxxxxx (Dmitri(Cabling-Design.com))
hath wroth:

Could be of interest to those deploying wireless in 5.25-5.35Ghz band

Excerpts from Proxim memo:

Regulatory Alert
A new FCC regulation will impact the sale of radios operating in the
5.25-5.35 GHz band. On July 20, 2007 only products that support detection
of the 5 radar types specified by the FCC in the 5.25-5.35 GHz band can be
imported or marketed.

The following document on FCC website describes the rules and has
additional links:
http://www.fcc.gov/oet/ea/presentations/files/oct06/Oct_06-DFS_Equipment_Authorization-AL.pdf

Does not sound like it's going to affect existing equipment but will
impact sales of new devices. Proxim, for example had to axe 3 devices.

--

Best Regards,
Dmitri Abaimov, RCDD
http://www.cabling-design.com/
Home Cabling Guide, Cabling Forum, color codes, pinouts and other useful
resources for premises cabling users and pros

It's not just 802.11a. There are plenty of non-802.11a type systems
using the various UNII bands. 802.11a is just one of many
modulation/encoding schemes in use on these bands. A few notes...

DFS (Dynamic Frequency Selection) and TPC (Transmit Power Control) are
part of 802.11h, which is the European flavour of 802.11a as adopted
by WRC-03 (World Radiocommunications Conference 2003):
<http://standards.ieee.org/getieee802/download/802.11h-2003.pdf>
<http://en.wikipedia.org/wiki/Dynamic_Frequency_Selection>
<http://en.wikipedia.org/wiki/Transmit_Power_Control>
In theory, this makes such equipment compliant with European HiperLAN
systems.

In 2003, the FCC released another 255MHz (11 channels), in addition to
the existing 325Mhz (13 channels), making DFS workable. The problem
was that it took another 2-3 years for the chip manufacturers to
incorporate these frequencies and 802.11h features in their chipsets.
As a result of the delay, much of what's on the market today does not
support 802.11h.

The FCC prohibits ad-hoc wireless between clients for 802.11a. There
is no such restriction for wireless bridges.

Note that 802.11h features must be in both the client and the access
point.

I don't have a clue what will happen to all the grandfathered
equipment or non-compliant equipment still in inventory.

--
Jeff Liebermann jeffl@xxxxxxxxxx
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
.

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