[opendtv] Re: News: Microsoft, Philips Offer New White Space Test Results

  • From: "johnwillkie" <johnwillkie@xxxxxxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Mon, 1 Oct 2007 11:17:46 -0700

"showing test results" (after implying FCC staff may have altered your
equipment) isn't going to cut it.  They have to prove it.  

Where is the sentence about them submitting the devices to the FCC for
testing "like everybody else does?"

John Willkie

-----Mensaje original-----
De: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] En
nombre de Craig Birkmaier
Enviado el: Monday, October 01, 2007 4:53 AM
Para: OpenDTV Mail List
Asunto: [opendtv] News: Microsoft, Philips Offer New White Space Test
Results

http://www.tvtechnology.com/pages/s.0157/t.8766.html


Microsoft, Philips Offer New White Space Test Results

September 28, 2007

Microsoft and Philips, seeking FCC rules that would allow unlicensed 
mobile devices to operate in the unused channels known as white 
spaces, showed the FCC new test results the companies say prove their 
prototype devices have the ability to detect-and thus avoid 
interfering with-DTV signals.

TV Technology columnist Doug Lung takes a close look at the 
Microsoft-Philips data in this week's RF Report.

The tests were conducted at about 1,000 sites in the New York and Los 
Angeles areas, within and 10 miles outside TV channel contours. The 
devices detected DTV signals above -114 dBm-the sensitivity threshold 
suggested by the technology companies of the White Space 
Coalition-100 percent of the time, according to the companies.

"The data collected clearly demonstrates that a threshold of -114 dMb 
protects viewable TV signals within and even well outside of 
television contours," the companies wrote in a 73-page presentation 
to the commission. "The real world data presented here proves that 
the broadcasters' assertion that over-the-air sensing is not 
technically feasaible and does not provide them with adequate 
protection is simply wrong."

Edmond Thomas, the former FCC Office of Engineering and Technology 
chief now representing the White Space Coalition, made the company's 
case in person to current OET boss Julius Knapp and others Sept. 20.

Thomas encouraged the FCC to do its own testing of the devices, even 
if it meant delaying an order on the spectrum by a few months. 
Microsoft and Philips have previously asked the FCC to conduct more 
tests before making a decision.

David Donovan, president and CEO of the Association for Maximum 
Service Television (MSTV), panned the tests.

"If you go through their data, they found holes. In fact, they found 
lots of holes," he said, referring to spots where the DTV signals 
dropped to -115 dBm. In those places, sensing no channel, the white 
space devices would transmit, causing interference. "Their own data 
proves our point."

Asked about the tests, FCC Chairman Kevin Martin said evaluation the 
devices was ongoing and that all parties involved are interested in 
ensuring the devices are working properly. He said he would rely on 
FCC engineers to set the pace did not predict a timeline for an FCC 
order.

Summer tests by the FCC showed a range of interference issues for the 
prototypes. Microsoft said later its box had been defective, and 
Philips made improvements later to its box, the company told the FCC.
 

 
 
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