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Winning Back the Weather Radio Channels Adds Capacity to 5GHz Wi-Fi Spectrum

In my last blog on 5 GHz spectrum, I discussed the recent FCC ruling that permitted outdoor access points to use the U-NII 1 band (5150-5250 MHz).

But the story doesn’t  stop there. As mentioned last time, there are significant technical challenges to using the 5 GHz band. It is not cleared spectrum. It contains incumbent uses that are important for national security and public safety. Therefore, it is imperative that Wi-Fi not create harmful interference to these incumbent systems. Cisco will not settle for less.

On the topic of interference, a particularly interesting component of the same  FCC ruling that opened the U-NII1 band for outdoor AP’s is that it also re-opened the Terminal Doppler Weather Radar (TDWR) band (channels 120, 124, 128) with new test requirements for DFS protection. Hold on, let’s backtrack a bit before diving into what this means:

What is TDWR?

In brief, Terminal Doppler Weather Radar (TDWR) “is a Doppler weather radar system used primarily for the detection of hazardous wind shear conditions, precipitation, and winds aloft on and near major airports situated in climates with great exposure to thunderstorms in the United States.” TDWR uses the frequency band from 5600-5650 MHz which is why wireless network equipment needs to be proven to “do no harm” to TDWR. If you’re curious for more information on TDWR, then please click here and/or here.

A Brief History

Many of you reading this will recall that the FCC closed the use of the TDWR band several years ago as the result of numerous reports of wireless equipment creating interference with TDWR. Read More »

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U.S. EPA Lauds Cisco for Meeting Greenhouse Gas Reduction Goal

Cisco is pleased to announce that we received the U.S. Environmental Protection Agency (EPA) 2014 Climate Leadership Award for Excellence in GHG Management (Goal Achievement). This award recognizes organizations that publicly report and verify corporate greenhouse gas (GHG) inventories and achieve aggressive GHG emissions reduction goals.

This is the second year in a row Cisco has been recognized by the EPA. Last year we won the Supply Chain Leadership Award for managing and reducing GHG emissions throughout our supply chain.

Cisco was one of 15 organizations and two individuals recognized at the Climate Leadership Conference in San Diego, California yesterday. Cisco received the award because we met our first 5-year goal, announced in June 2007 to reduce all scope 1, 2 and business air-travel Scope 3 GHG emissions* worldwide by 25% on an absolute basis from 2007 to 2012.

 

Andy Smith (right) accepts the 2014 EPA Climate Leadership Award on behalf of Cisco

Andy Smith (right) accepts the 2014 EPA Climate Leadership Award on behalf of Cisco

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