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Researchers Transmit Optical Data at 16.4 Tbps 2550km
Stony Stevenson writes "The goal of 100 Gbps Ethernet transmission is closer to reality with the announcement Wednesday that Alcatel-Lucent researchers have recorded an optical transmission record along with three photonic integrated circuits. Carried out by researchers in Bell Labs in Villarceaux, France, the successful transmission of 16.4 Tbps of optical data over 2,550 km was assisted by Alcatel's Thales' III-V Lab and Kylia, an optical solution company. The researchers utilized 164 wavelength-division multiplexed channels modulated at 100-Gbps in the effort."
I calculate roughly 248,000 Library of Congresses per fortnight.
Curse my geeky genes for making me calculate that when you asked.
GE/CS/IT d- s: a- C++++$ UL+++ P-- L++++ E W+++$ N+ o? K- w---() !O M- V- PS+ PE(++) Y+ PGP+++(+) t+++ !5 X++> R- t
(14 * 24 * 60 * 60) / (20 / 2.2) = 123,984 LoCs/fortnight
(total seconds per fortnight)
14 days per fortnight
24 hours per day
60 minutes per hour
60 seconds per minute
all over
(seconds per Library of Congress transferred)
20 terabytes per second (one LoC/second)
2.05 terabytes per second (16.4 terabits per second
They had 164 lasers with different colours sending 100 Gbps EACH over the same fiber, splitting the colours apart again at the other end with what probably is a little more advanced than a prism.
10 ?"Hello World" life was simple then
Consider a standard computer utilizing two channels of ddr2-800. This only has a bandwidth of of 102.4 gbps. You would need to attach this connection directly to your ram in this case. Now computers are starting to utilize ddr3 which can theoretically provide double that in the same configuration. But at those speeds, amount of available ram would be limiting the actual throughput. 100gbps utilizing 128GB of ram would be emptied in 10.24s (1024gb/100gbps). Having to have a storage array capable of sending out 100gpbs continuously would require at least 125 drives at 800mbps(100MB/s is a good number) constantly. This is the reason 100gpbs isn't being considered for lan use. It just isn't feasible at this point.
I'd wadger they're using devices like a Diffraction Grating or a Fabry-Perot Etalon
Only a little more complicated than a prism :)
The problem has never been the glass! There is absolute craploads of dark fiber just about everywhere. Last time I saw stats it was something like less than 1/3rd of installed fiber was lit up. It's the uber expensive routing equipment needed to keep up with the flood of data that's the expensive part.
There are 4 boxes to use in the defense of liberty: soap, ballot, jury, ammo. Use in that order. Starting now.
If you really need greater than 10Gbps then go with Infiniband as you can get 12x HCA's that will do 24GBps (48Gbps full duplex). But if you're paying $50 for 10Gbps ethernet you're not getting offloading and your CPU's are probably swamped of your TCP/IP stack is the problem. I would suggest getting a pair of offloading 10Gbps cards and seeing if you don't see a huge improvement.
There are 4 boxes to use in the defense of liberty: soap, ballot, jury, ammo. Use in that order. Starting now.
"Everyone" is waiting for either 40Gbit/s or 100Gbit/s Ethernet.
The first one is what server-people push (they claim they do not need more, that's why 40Gbit/s was put into Ethernet standard),
while network people want full 100 Gbit/s.
> But what about all the LAN vendors, which have a real market for 100Gbps
They don't.
There seems to be market either for 40Gbit/s in LAN/local connections or for 100Gbit/s for core/long haul. At least judging but what happened with high-speed ethernet standard.
Data per boeing 747 (LCF version)
DVDR = 159238213.7 GB/747LCF
HDVD = 677609420 GB/747LCF
BDVD = 847011775 GB/747LCF
-nB
whois gawk date unzip strip find touch finger mount join nice man top fsck grep eject more yes exit umount sleep dump
Interrupt loads can be greatly reduced by switching to a polling-driven architecture. See FreeBSD.
Mea navis aericumbens anguillis abundat
Its called dense wave division multiplexing, or DWDM. You take independent links (in this case 100Gig links), and transmit each of them on a slightly different wavelength of light called a Lambda. Since optic is looking for a specific wavelength, you can now run many "virtual links" per physical fibre. This is the standard technology for most Telcos. The innovation here is that they are doing this with 100Gig transceivers, and they have chipsets fast enough to combine the different lambda's back together into on high speed link. And yes, you can now let the Lambda Lambda Lambda jokes fly
Colin McNamara - CCIE #18233 "The difficult we do immediately, the impossible just takes a little longer"