republican-creole
Search:  

 
 
   News
newer
story category World’s Fastest Wireless Network Tested in Italy
1.2 Terabit speeds have their limitations
02:44PM Sunday Sep 14 2008 by KathrynV
tags: wireless · alternatives
Scientists working at the Sant'Anna School of Advanced Studies located in Pisa, Italy have reported successful testing of what they are saying is the world’s fastest wireless network.
"They report that during an uninterrupted 12-hour experiment, they were able to achieve throughput speeds above 1.2 Terabits per second; which they say beats the previous wireless data transmission speed record of 160 Gigabits per second by Korean scientists. The researchers claim that speeds of this magnitude can typically only be achieved using fiber optics."
However, these scientists weren’t using fiber; they were using lasers in a technology called Free-Space Optical Communications. Although the speeds are impressive, there are some serious drawbacks that prevent the technology from being used even in places where fiber isn’t a viable possibility. The main drawback is that this is a line-of-sight technology which means that if obstacles interfere with the beam then the service cuts out. One suggestion is to use this type of technology for all back-end communications and then to use radio-based wireless technology for the “last mile”.

Related:
  1. Expect Wireless Carriers To Subsidize Netbooks Soon
  2. Ultra-Wideband At Death's Door?
  3. Clearwire CEO: FCC Approval Would Be 'Good Policy.'
  4. Combo WiMax/LTE Chips Arrive In 2009
  5. AT&T Confirms iPhone Tethering 'Soon'
  6. Qualcomm's 3G-Enabled 'PC Alternative'
  7. AT&T Still Using WiMax As Rural DSL Replacement
  8. Autonet In-Car Broadband Reviewed
Forums » World’s Fastest Wireless Network Tested in Italy
view: topics flat text 
Post a:

punker
deleted by moderator
Premium
join:2004-06-21
Palmdale, CA
clubs:

wireless

fiber?

TK Junk Mail
Go ahead, make my day
Premium
join:2002-03-03
Margate City, NJ
clubs:
·Comcast


edit:
September 14th, @03:17PM

Re: wireless

said by punker See Profile :

fiber?
No. It is OTA laser communication. No fiber involved.

Distance is limited due to atmospheric conditions and need to maintain eye safety stds.

Things that limit usable distance:
However, for terrestrial applications, the principal limiting factors are:

* Beam dispersion
* Atmospheric absorption
* Rain (lower attenuation)
* Fog (10..~100 dB/km attenuation)
* Snow (lower attenuation)
* Scintillation (lower attenuation) although to a lesser degree in LED Systems
* Background light
* Shadowing
* Pointing stability in wind
* Pollution / smog
* If the sun goes exactly behind the transmitter, it can swamp the signal.

Atmospheric and fog attenuation, which are exponential in nature, limit practical range of FSO devices to several kilometres.

And must meet eye safety stds:
Class 1 & 1M

CLASS 1 LASER PRODUCT
A class 1 laser is safe under all conditions of normal use. This means the maximum permissible exposure (MPE) cannot be exceeded. This class includes high-power lasers within an enclosure that prevents exposure to the radiation and that cannot be opened without shutting down the laser. For example, a continuous laser at 600 nm can emit up to 0.39 mW, but for shorter wavelengths, the maximum emission is lower because of the potential of those wavelengths to generate photochemical damage. The maximum emission is also related to the pulse duration in the case of pulsed lasers and the degree of spatial coherence.

Class 1M
A Class 1M laser is safe for all conditions of use except when passed through magnifying optics such as microscopes and telescopes. Class 1M lasers produce large-diameter beams, or beams that are divergent. The MPE for a Class 1M laser cannot normally be exceeded unless focusing or imaging optics are used to narrow the beam. If the beam is refocused, the hazard of Class 1M lasers may be increased and the product class may be changed. A laser can be classified as Class 1M if the total output power is below class 3B but the power that can pass through the pupil of the eye is within Class 1.

en102
Canadian, eh?

join:2001-01-26
Valencia, CA
·RoadRunner Cable
·DSL EXTREME
·DSL EXTREME

Re: wireless

Mosquitos, birds, and just about anything else that comes between the 2 sites would cause disruption (i.e. as noted smog in southern Calfornia may cause diffraction).

This would be ok to use between lets say a space station and the moon if distance isn't a limitation. Lining it up at those distances would be an issue though.
--
Canada = Hollywood North

Mike
Premium,Mod
join:2000-09-17
Pittsburgh, PA
clubs:

Re: wireless

Oh sweet. A long range bug zapper / porn downloader.

Always wanted one.

TK Junk Mail
Go ahead, make my day
Premium
join:2002-03-03
Margate City, NJ
clubs:
·Comcast

Re: wireless

said by Mike See Profile :

Oh sweet. A long range bug zapper / porn downloader.

Always wanted one.
That reminds me of the film "Real Genius" where a laser fills a house with popcorn when the laser hits a big popcorn ball at the end of the movie.

»www.youtube.com/watch?v=S2rtmoSuoL4

Watch 30 secs to 90 secs in to the video.
--
My BLOG .. .. Internet News .. .. My Web Page
Ask yourself one question: 'Do I feel lucky?' Well, do ya punk?

kfolsom
Where the fit hits the shan
Premium
join:2003-01-31
Yucaipa, CA
·Verizon west (ex G..

Re: wireless

said by TK Junk Mail See Profile :

said by Mike See Profile :

Oh sweet. A long range bug zapper / porn downloader.

Always wanted one.
That reminds me of the film "Real Genius" where a laser fills a house with popcorn when the laser hits a big popcorn ball at the end of the movie.

(youtube clip)
30 secs to 90 secs in to the video.
"ICE IS NICE!!!"
--
Civil disobedience is still disobedience.

digitalfreak
Frodo failed. Bush has the ring

join:2005-12-09
49533


edit:
September 15th, @10:22AM

said by TK Junk Mail See Profile :

said by Mike See Profile :

Oh sweet. A long range bug zapper / porn downloader.

Always wanted one.
That reminds me of the film "Real Genius" where a laser fills a house with popcorn when the laser hits a big popcorn ball at the end of the movie.

(youtube clip)
30 secs to 90 secs in to the video.
LOL You realize you just posted a link to an illegal file on the internet? I guess all that anti-piracy and copyright infringement rhetoric you spew around here only applies to everyone else.

chucky5150
Divers do it Deeper

join:2001-11-03
New Iberia, LA
clubs:
·Charter Pipeline

While watching some show on the Science channel they did in fact send a laser beam from a satellite to earth and were able to transmit information. However, I don't recall what the speeds where.
--
Member of the US Air Force since May 7th, 2002 To March 29th, 2005

"You sneak up behind yourself and remove your pants before you realize what's going on." KOL
cbiggers

join:2000-08-10
San Luis Obispo, CA
clubs:

Re: wireless

That list of bullets looks strikingly familiar to Wikipedia...

totalaccess
Premium
join:2002-10-04
Elgin, TX
nope - laser. 1.2 terabytes a second.

meh37

@verizon.net

Re: wireless

1.2 terabits per second (that's "tera" as in metric/decimal--data comm speeds are measured/represented in decimal/metric and not binary, so orders of 1,000 not 1024, because bits are simply being counted and not being represented as some amount of "storage")

That's 1.2 trillion bits per second.
devnuller

join:2006-06-10
Hollis, NH
·Verizon Online DSL
·Charter Pipeline


edit:
September 14th, @03:58PM

Disclaimer


Disclaimer
For those that don't read directions until they are needed
TheMG

join:2007-09-04
Edmonton, AB

Not very impressive.

Essentially what they did is fiber without the fiber. Just beam the laser right through the air. Ok, it's not quite THAT simple, but still, I don't consider that true wireless.
EPS

join:2008-02-13
Hingham, MA

Re: Not very impressive.

Even if the technology isn't RF and is very limited in its applications, 1.2 Terabits is still fairly impressive, I'd think...
bjbrock

join:2002-10-28
Mcalester, OK
It is exactly 100% wireless. By definition. A laser beam and a radio wave are exactly the same thing - electromagnetic radiation. It doesn't get any more wirless than that.
bjbrock

join:2002-10-28
Mcalester, OK
Laser and RF are the exact same thing - electromagnetic radiation. That is about as wireless as you can get.
ITALIAN926

join:2003-08-16
Stratford, CT

silly, just silly.

Line of sight lasers, a completely ridiculous concept. Theres way too many things that can disrupt the signal. Maybe this can do better in Arizona...and all the people will walk around with saftey glasses. LOL

TCub
I'm metal.
Premium
join:2008-09-03
Olmsted Falls, OH
clubs:

Re: silly, just silly.

Why not just send the laser through some sort of pipe or small tunnel. At corners or bends you could use mirrors or something to deflect the light. Instead of worrying about losing your connection due to atmospheric conditions.

r81984
Tough to beat.
Premium
join:2001-11-14
Morgan City, LA
·Cox HSI
·Insight Communicat..
·AT&T Midwest

Re: silly, just silly.

said by TCub See Profile :

Why not just send the laser through some sort of pipe or small tunnel. At corners or bends you could use mirrors or something to deflect the light. Instead of worrying about losing your connection due to atmospheric conditions.
Or better yet, shoot the laser through small wires of glass.
--
»www.ryanoneill.us
wispalord

join:2007-09-20
House Springs, MO
thats what a fiber optic cable is.
Oedipus

join:2005-05-09

edit:
September 14th, @07:08PM

Re: silly, just silly.

No way. It's not possible that that's what he was insinuating at all.
jimbopalmer

join:2008-06-02
Greenwood, MS

FSO is a fine technology, in place today. Canobeams have been in use at least a decade. While it needs LOS, it does not need anywhere near as much Fresnel Zone as Radio.

»www.usa.canon.com/industrial_can···dex.html

»en.wikipedia.org/wiki/Free_Space_Optics

Today's announcement just increases the speed from Gigabits to Terabits.
--
I tried to remain child-like, all I achieved was childish.

hayabusa3303
Over 200 mph
Premium
join:2005-06-29
clubs:

Not be be a ass but

Where is America is this? Thats right we are playing with caps now we dont need this.
iansltx

join:2007-02-19
Fredericksburg, TX
·Comcast
·Qwest.net
·magicjack.com
·BeeCreek Communica..
·Sprint Mobile Broa..

FSO FTW

So we've got Corning bendable fiber (amazingly flexible if you ask me) pushing three terabits per second and this pushing 1.2. The thing is, regular computers can probably only sustain 400 Mbps, and laptops would be more like 300 Mbps. WIth all that leeway, surely you could use FSOs for ultra-high-speed consumer internet in rural areas. Right now these glorified WiFi systems don't do all that great with interference anyway on the 900 MHz or 2.4 GHz bands...even if FSOs allows for 0.001% of their theoretical bandwidth you'd still get a 12 Mbps connection, better than what's currently being piped over copper or coax to most of the US.

Light-based processing, fiber, FSO's...looks like photons are the new electrons. Cool?

XBL2009
------

join:2001-01-03
Chicago, IL
·AT&T Midwest

Re: FSO FTW

said by iansltx See Profile :

So we've got Corning bendable fiber (amazingly flexible if you ask me) pushing three terabits per second and this pushing 1.2. The thing is, regular computers can probably only sustain 400 Mbps, and laptops would be more like 300 Mbps.
With solid state hard drives only a couple years away having a 1Gbps network won't seem like a big deal.
iansltx

join:2007-02-19
Fredericksburg, TX

Re: FSO FTW

True; you can get an SSD now that can do 1Gbps and WD Velociraptors can do the same, but that's the equivalent of 50/20 FiOS right now...too hot to handle considering the cost for people.

mrchris
No more bailouts
Premium
join:2002-10-01
North Babylon, NY

What?

The thing is that we don't even have hard drives that can achieve such read and write speeds so what is the point besides LAN stuff and large networks?
iansltx

join:2007-02-19
Fredericksburg, TX
·Comcast
·Qwest.net
·magicjack.com
·BeeCreek Communica..
·Sprint Mobile Broa..

Re: What?

Umm...LAN stuff and large networks. If you can get a Tbps back\bone (as opposed to 10 or 40 Gbps right now) you can shoot 4k (2x HD) video through the pipe to consumers all day. Or 1080p HD video all day and all night, at Blu-Ray quality

johnny_t
Premium
join:2004-03-21
Palo Alto, CA

Re: What?

Give me 1gb/sec & no caps I'm happy.

unlucky



Re: What?

said by johnny_t See Profile :

Give me 1gb/sec & no caps I'm happy.
Amsterdam any1?

Aintskeerd

@comcast.net

Re: What? - Pushing the envelope!

If we stop evolving technologically, then there would be even less and less new cool stuff! Just because a hard drive can't achieve these speeds does not mean that there are other applications for this technology. I have installed LightPointe and fSona FSO links before and this applications is not for one pc. Sometimes it is because of cost, other times it is the inability to wait for fiber or copper to be provisioned.

gregf

@verizon.net

so

Not everything that is news on this site is for home use. Like one of the posters said above, it can be a great LOS communication for space and the like.

Futurist55

@frontiernet.net

Re: so

I can imagine this is the next communication revolution but they have to make it viable. How does a beam of light go the number of things that can get in the way. you would have to put a emense Size satellites with big enough mirrors to bounce the signal lets say from LA to NY. Not to Mention the amount of space debris that can get in the way and the alignment would have to be to a millionth to the inch. You off by a inch you are off a thousand miles. But I do believe its viable the probably the best thing out there for world communication to literally be faster and cheaper. If anyone has ever watched the serious 2054 they gave a quick peak of something like this and i believe it would be cheaper to use a satellite to bounce the beam of light from NY to Beijing then to lay thousands of miles of cable on the sea flow every few years

idjk

@144.226.x.x

Re: so

Sound like microwave of old-every time there was fog the office to office trunks (telco) would go crazy-but if they did the laser to last mile it would not be long b4 the kids were flying kites up to block the signal--what fun.
But all research has value!

maartena
Obama 2008

join:2002-05-10
Orange, CA
·RoadRunner Cable

Say we colonize the moon or Mars....

...Could we use this technology to create a pretty damn fast link between a satellite orbiting Earth, and a satellite orbiting Mars? (Maybe with a relay satellite if Mars and Earth are out of each other's view).

I mean it's pretty easy with a focused radio beam to bring lots of bandwidth up to a satellite, and beam it back down.... see satellite providers, and the ISS internet connection.

But using radio technology all the way to Mars trickles your bandwidth down to less-then DSL speeds at best... which is good enough for current orbital satellites taking pictures of the place, but if we want to setup a serious colony with some serious labs..... we are going to need a way to send over a LOT of data, using a PUSH technology (reply time is 10+ minutes, regular TCP/IP won't work) of some sorts....

I am wondering how much signal degradation there is over such enormous distances.
--
Obama 2008 - Because McCain is more of the same!

maartena
Obama 2008

join:2002-05-10
Orange, CA
·RoadRunner Cable

Evil geniuses at work.....

.... let's invent a laptop with a laser receiver. And a big OAR with a mirror on top to intercept the signal....

Heh.
--
Obama 2008 - Because McCain is more of the same!
Forums » World’s Fastest Wireless Network Tested in Italy


Wednesday, 03-Dec 13:47:43 Terms of Use | Privacy Policy | Hosting by www.nac.net - DSL,Hosting & Co-lo | feedback | contact
over 9 years online! © 1999-2008 dslreports.com.republican-creole