Posts Tagged Crunch

Does AT&T need more spectrum? It’s complicated

Posted by on Wednesday, 16 November, 2011

AT&T's proposed WCS spectrum sale

Sprint believes it has caught to have AT&T in a ‘gotcha!’ moment. While AT&T is using the threat of a spectrum crunch as justification to buy T-Mobile, Ma Bell is trying to sell off mobile broadband airwaves it already owns. In a letter to the Federal Communications Commission, Sprint basically calls AT&T a hypocrite, citing AT&T’s intended sale of its 2.3 GHz spectrum as another reason for the FCC should deny AT&T and T-Mobiles’ -billion deal. While Sprint has levied plenty of dead-on criticisms against AT&T-T-Mobile deal in the past, this time the operator has overshot the mark.

Here’s an excerpt for Sprint’s letter, signed by Sprint attorney Charles Logan:

“AT&T, in fact, has more licensed spectrum than any other CMRS provider in the country. Other wireless carriers, such as Verizon, manage to serve more customers with less spectrum resources than AT&T by using their existing spectrum licenses, deploying new technologies, and investing in infrastructure. To the extent AT&T can be said to be constrained at all, therefore, any ostensible limitations are the result of years of underinvestment by AT&T in its network and AT&T’s failure to put its existing spectrum to more efficient use – or, in the case of AT&T’s WCS spectrum, to any use at all.”

Heady stuff, but it ignores the fact that the 2.3 GHz Wireless Communication Services (WCS) spectrum bands are a mess. Ever since the licenses were auctioned off in 1997, every major operator owning WCS has tried to find some use for that spectrum, but they all came up with squat. Power restrictions in the band make it useless for any kind of mobile voice and broadband service. And attempts by AT&T and BellSouth (which AT&T acquired) to use it for fixed wireless DSL-replacement technologies fell flat after numerous trials.

The specific C-block and D-block licenses AT&T is trying to sell in partnership with NextWave are even more problematic. They straddle opposite ends of the Satellite Digital Audio Radio Service (SDARS) band used by Sirius XM Radio, requiring any network to have a guard band to prevent interference with Sirius’ radio signals. That means the already small allotment of capacity in each block, 5 MHz, is cut in half.

At worst, AT&T is guilty of putting lipstick on this WCS pig — rouge and fake eyelashes as well — in attempt to find a buyer for the licenses. AT&T pointed out just how worthless these licenses are in its public policy blog after Public Knowledge made similar criticisms of hypocrisy. Yet, the little fact sheet AT&T and NextWave put together to market the spectrum paints WCS in much gentler light. In those materials, AT&T claims that the licenses can be used for all kind of nifty applications: smart grids, supplementary downlink for mobile networks, fixed wireless broadband access, backhaul and one-way broadcast services.

Related research and analysis from GigaOM Pro:
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  • Sprint’s tightrope walk: finding a balance for its network modernization plan
  • The future of mobile: a segment analysis by GigaOM Pro
  • Mobile Q1: All Eyes on Tablets, T-Mobile and AT&T



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Star Wars Vehicle Pancake Mold/Cookie Cutter Is Your Edible Deal of the Day [Dealzmodo]

Posted by on Tuesday, 20 September, 2011

The Big Crunch: Physicists Make Time End

Posted by on Thursday, 28 July, 2011

The same researchers who used exotic substances called metamaterials to make a benchtop Big Bang have mimicked the end of time, also known as the Big Crunch.



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Gadget or tragic? PIC Microcontroller Project

Posted by on Thursday, 29 July, 2010

25 years on, I decided to take up an old hobby – electronics. Whereas Z80 microprocessors were the leading edge 25 years ago, today, microcontrollers are the chip of choice. So I needed to define a simple project to grown my knowledge from zero. I took an analogy on a radio controlled vehicle and decided that was it. I would re-use an ancient joystick at one end and use even more ancient fischertechnik from my childhood days to put together a joystick controlled vehicle. At the joystick end I use 16F873 microcontroller to read the voltages on the joystick and crunch the values down to a command. for each motor I have forward, backward or stop plus a pulse width modulated power rating from 0 to 100%. The command is assembled in ASCII and then sent down the wire at 1200 baud (wireless to come shortly, hopefully) . At the fischertechnik vehicle end of the wire, a 16F627 microcontroller de-serialises the message, checks the header and payload, and if it checks out OK, sets the motors directions and speeds. This is repeated several times each second. For the pulse width modulated speed control, I use a second thread kicked off 5000 times a second to prvide the pulses. An L293D dual bridge driver powers the motors at about 7v from the 4.8v logic levels of the 16F627 chip. There are about 350 lines of assembler on the vehicle and about 250 on the joystick, most of which is defensive programming, error checking and trace. I take the NASA approach to things like this, something is
Video Rating: 4 / 5


Police sketching technology

Posted by on Thursday, 10 June, 2010

Technology Curve
technology
Image by Wonderlane

Police sketching technology
Photo:  Sean Doherty’s desk at the Concord Police Department reveals a mix of old transparency methods, left, and new computer software to create police suspect sketches from a witness’ memory of the event at the Concord Police Department on Thursday, June 10, 2010. Witnesses used to pick out various feature transparencies that matched the suspect, and those transparencies would be laid on top …
Read more on Concord Monitor

Cassidy: Linux could ease schools tech crunch
In the shadow of the world’s biggest technology companies, some Silicon Valley schools are struggling to maintain classroom computers better suited for a history museum. If tech companies aren’t ready to solve the problem, maybe Tux the Linux penguin can ride to the rescue.
Read more on San Jose Mercury News


TC Electronic VPD1 Vintage Pre Drive Review Part 1 Kleber K. Shima

Posted by on Thursday, 3 June, 2010

TC Electronic Vintage Pre Drive é um overdrive + booster que vai de um leve crunch até um hi-gain distortion. Feito na Dinamarca, é um pedal fantástisco pois conta com vários recursos, como speaker simulator, saída remote (exclusivo para o G-System). O Booster é de ganho e não de volume. No canal de booster temos um controle de grave e uma chave de três posições. Na posição superior temos um top boost de 1kHz, posição central flat e posição inferior temos um mid boost de 500hz. Isso faz com que o VPD-1 seja extremamente versátil, além da qualidade indiscutível da TC. Particularmente, estou aposentando quase todos os meus pedais de boutique, pois esse pedal tem uma aplicação extremamente profissional.
Video Rating: 4 / 5