Now blogging at diego's weblog. See you over there!

more about Nextel

In a comment to my previous post on recent moves by Nextel Juan Cruz corrected me regarding the workings of the Nextel system. He said:

Diego, in Nextel's PTT system, the message is compressed, assembled as a series of packets, and then sent to the (cell) network, that routes it to the proper handheld.

The trick here is that (from the cost perspective) is that when you send a message it usually uses the network for a couple of seconds only, and because the message goes one way, there is no need to ACK that the final recipient got it, the terminal must only make sure that the local cell has it.

Is basically a store-and-forward system.

In Argentina it (and several other countries as well) it's already a cell phone operator. The only country where it does not have decent a market as a cell-phone op is in the US.

The company is split in two branches (in the US): Nextel and Nextel International. The former handles local business and the latter only international branches.

And Jim Added:
Juan Cruz is spot on, I really didn't grasp the idea of PTT at first, but if you think of it as a form of VOIP which seems to be what FasTxt are doing with their app on Symbian phones and using GSM/GPRS as the carrier, you can see some of the advantages.

This way you only have GPRS costs for the data your phone sends and receives rather than full minute by minute pricing for a long call.

Thanks for the clarification! Obviously I got carried away by my own ideas about how these things should work :) Interesting to know that what I'm talking about (direct phone-to-phone connections when possible, something akin to WiFi in Ad Hoc mode between two nodes) doesn't even exist (at least not for cell phones :)).

Categories: technology
Posted by diego on May 23, 2003 at 5:29 PM

'Visual Java'?

News.com: New Java tool targets simplified development. They also mention Sun ONE Studio, "which is targeted as more highly skilled developers." No kidding. Sun ONE Studio is a mess, incredibly difficult to use. We'll see what they come up with to make Java easier to program against, it's certainly doable.

Categories: soft.dev
Posted by diego on May 23, 2003 at 3:00 PM

studying for profit

From the New York Times: Computing's lost allure.

<rant>
Why is this a problem? These people were getting in just because there was the promise of easy money and whatever? You need a financial bubble to like Computer Science? You should go to college to learn, and do what you like. If the situation in the stock market (or the job market even) makes you change your mind, I say: good riddance.
</rant>

Categories: technology
Posted by diego on May 23, 2003 at 12:12 PM

looking back to see ahead

Kevin Werbach on the Post-PC, Post-Web world. Quote:

Sure, computers will become more powerful, data networks will become faster, and storage devices will become capable of holding infinitely more data. That's just the background story. Getting vast numbers of individuals and businesses online was an extraordinary achievement, but except for certain underserved communities, it's largely done.

What matters today is using all that connected power, and the standards-based software environment that rides on it, in productive ways. From enabling distributed work teams in companies to collaborate on projects to giving people rich interactive experiences that travel across different hardware and connections, these are tasks we could only think about tackling once the foundations were laid.

While we were all focused on the dot-com bubble and the subsequent bust, "yesterday" shifted.
Smart companies understand this change. IBM, you will notice, is no longer touting e-business, its code word for the Web. It has shifted its energy to next-generation developments such as Linux, grid computing and autonomic computing. Microsoft is pouring resources into post-PC and post-Web businesses, understanding that it must make significant long-term bets to prepare for the day when its traditional Windows cash cow disappears. Dell Computer is even going so far as to remove "Computer" from its name. Apple Computer is rapidly moving from an emphasis on easy Internet access to "digital lifestyle" offerings such as photo sharing and music downloads. And America Online, though struggling, knows that it needs to change from the company that gets you on the Web to the company that gets you beyond the Web.

Excellent article!

And speaking of looking back, Bob Metcalfe on 30 years of Ethernet, and Philip Greenspun comparing the evolution of wireless in the US and Europe to the development of trade barriers.

Categories: technology
Posted by diego on May 23, 2003 at 10:16 AM

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