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How Microwave Transmission Is Linking Financial Centers At Near-Light Speed
The L.A. Times has a short but compelling article about the state of the art (and coming state of the art) in dedicated networking technology in one of the applications where you'd expect the customers to care most about it: connecting financial trading centers. Milliseconds count, and the traders count milliseconds. From the article, one example:
"[New York-based networking company] Strike, whose ranks include academics as well as former U.S. and Israeli military engineers, hoisted a 6-foot white dish on a tower rising 280 feet above the Nasdaq Stock Market's data center in Carteret, N.J., just outside New York City.
Through a series of microwave towers, the dish beams market data 734 miles to the Chicago Mercantile Exchange's computer warehouse in Aurora, Ill., in 4.13 milliseconds, or about 95% of the theoretical speed of light, according to the company. Fiber-optic cables, which are made up of long strands of glass, carry data at roughly 65% of light speed."
There was a story a few weeks ago about someone in Chicago that had a faster than light connection (when the Fed issued a statement about interest rates)
Whatever you're smoking please share.
Sending a neutrino beam through the earth will be faster than taking the great-circle route across the surface of the earth.
Of course, one would have to send a ridiculously large number of neutrinos to be sure to have them detected, but that's just an engineering problem.
I love Mondays. On a Monday, anything is possible.
here you'd expect the customers to care most about it:
Yeah, and what customers? Electronic trading supercomputers.
None of this makes a difference to honest trading except to ensure its loss making properties.
Do it yourself, because no one else will do it yourself. [beta blockade 10-17 Feb]
Only if not used to take advantage over said ordinary citizens.
The fact that the traders count milliseconds is proof that they are just scam artists. Parasites, producing nothing of value. High-speed trading is nothing but a mechanism for funneling money to the rich from everyone else.
Step 1: Intercept the transmisson Step 2: ??? Step 3: Profit!
Nope, nope, nope. The speed of light is c, the speed of light in various materials is denoted as factors of c (0.65c or 0.99999c).
Considering the Nova episode 'making things faster' with David Pouge as the host presented this over a month ago, and they have production lead time delayse amounting to months, I'm with the people suggesting that this is a repeat. And hardly qualifies as 'news'.
That said, cool.
Also noted in the Nova episode was that the physical path that the fiber-optic route takes is going to be longer than the path that the microwave route takes.
If they are not doing it already, I would suspect that the next step will be to move the repeater electronics up to the microwave dishes at the intermediary locations. My experience with telcom is that this is usually housed in the shelter at the base of the towers, however if they can locate it with the dishes it will eliminate a path distance of at least twice the sum of the elevations of the dishes, divided by the velocity factor of the media they use to connect those, (roughly 1 for dry waveguide, and usually between .6 and .9 for different varieties of co-ax media.) It's not a lot, but if they are looking to eliminate every possible delay, that's got to be in their plans.
You never know...
the next guy up will put up a series of dead-straight tubes, that they can create a vacuum in, then pass the microwaves through the tubes, just to get 97% of the speed of light.
and of course, he will also be able to claim a patent on transmitting the internet through a series of tubes.
Sleep your way to a whiter smile...date a dentist!
The high speed trading field is bein geviscerated by the placement of FPGA based devices on fiber leaving the building. There's no point ot a "high speed link", with all the insanity involved in that technology, when you can program a sophisticated monitor and sales control tool right outside the stock exchange.
Now, the center that analyzes the history of such data and builds your models of how to respond can be in another state and pre-program the FPGA. But these devices are already being used: It took me twenty minutes to stop laughing at a job interview with one such company: I was unsure just which of my talents they wee interested in until I noticed a display of such devices, and realized they wanted me to assist in their migration to a much, much cheaper part of the country for all their modeling and analysis tools, and just leave a box or two of Nallatech FPGA cards at the New York Stock Exchange.
It was amazing how fast they put the NDA in front of me when I explained the implications to their core business model, and started tying it to the repercussions of moving *away* from the human contacts that provide back channel, essentially insider knowledge, when the analysis boxes are no longer in the data center with your own staff on site. My speculative "if you need to tune these models manually, you need to secure the information, and who is allowed to change that model? how do you manage the provenance of such orders" discussion apparently set off alarm bells that urged them to get me under an NDA, whether or not they ever made an offer. Life got really adventuresome when I refused to sign an NDA without an offer on the table.
For some place that's supposed to be for nerds who, unlike me, finished college, this discussion is embarrassing. Parent post and 1 or 2 other posts have it right, and this is something that every radio guy knows as well.
Wikipedia references: http://en.wikipedia.org/wiki/Velocity_factor
More general discussion with heavy math: http://en.wikipedia.org/wiki/Group_velocity
The reason for it all: http://en.wikipedia.org/wiki/Refractive_index
This is straight from the horse's mouth: http://www.corning.com/WorkArea/downloadasset.aspx?id=39403
It looks like another symptom of why China is going to kick our ass. All this effort put into getting crumbs from what other people do instead of doing something tangible.
The speed of light in a vacuum is c. Otherwise you are correct.
Look up cherenkov radiation for a cool example of particles exceeding the speed of light in the local medium.
"Nine times out of ten, starting a fire is not the best way to solve the problem." - my wife