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400 Gbit Ethernet: The Next Leap

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Bert22306
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Why not an easier path to 1Tb/s
Bert22306   8/12/2014 8:21:39 PM
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Looks like the oddity of 40Gb/s Ethernet, which doesn't fit in the powers of 10 scheme Ethernet has used in the past for speed increments, has become perpetuated. It would seem more logical to introduce a 500Gb/s version, instead of 400G, which would then give you an easy path to the 1Tb/s level.

Two lanes of 500G seem infintely easier than 10 lanes of 100G!

prabhakar_deosthali
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Do we really need that 400G ?
prabhakar_deosthali   8/13/2014 2:01:41 AM
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If any one just monitors his/her Inbox , for every genuine email there are almost 20 SPAM and univited emails pushed into your mailbox.

 If we extrapolate this , almost 95% of email internet traffic is junk.

 Similar scenario can be found in other traffic such as video downloads by individuals, the same old jokes making rounds of message boxes and overfilling them, Gbs and gbs of emails lying in everybody's mailboxes unread and undeleted just because of the laziness of the users to do some housekeeping on the regular basis, thousands of photos on each facebbok page lying unseen and what not.

 

Isn,t it an utter misuse of the available resources just because the users are getting them free  ( free email accounts with unlimited storage, free FB accounts again with unlimited storage)

 

And here we are scratching our heads as to how to go to next level of the bandwidth, the next level of storage, the next levl of data centers..

 

Isn't this a right time to make the people understand the valeue of the resources they are using( wasting is the right word) by making such services chrageable.

 

I am sure the internet bandwidth , whatever is available today will be much more than sufficient if we do way with these free services available on internet.

 

MeasurementBlues
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Re: Why not an easier path to 1Tb/s
MeasurementBlues   8/13/2014 8:57:21 AM
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The multiples of 4 (40, 400) is a leftover from telecom speeds. OC-768 is 40Gbps. Once data rates hit 40Gbps, they are now increasing in multiples of 10 instead of multiples of 4.

Ethernet has always gone in multiples of 10.
Optical Carrier:
OC-1 51.48Mbps Optical Carrier SONET - All OC-n are 51.48*n Mbps
OC-3 155.52Mbps Optical Carrier SONET
OC-12 622.08Mbps Optical Carrier SONET
OC-48 2.4Gbps Optical Carrier SONET
OC-192 9.6Gbps Optical Carrier SONET
OC-256 13.1Gbps Optical Carrier SONET
OC-768 40Gbps Optical Carrier SONET


MeasurementBlues
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Re: Do we really need that 400G ?
MeasurementBlues   8/13/2014 9:07:57 AM
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I recall attending the OFC (optical fiber) conference where a network engineer from facebook told an audience how they needed 100Gbps now (5 years ago) and they wanted 1Tbps speeds.

If someone is willing to pay for higher speeds, someone will develop it.

"And here we are scratching our heads as to how to go to next level of the bandwidth, the next level of storage, the next levl of data centers.."

Bert22306
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Re: Why not an easier path to 1Tb/s
Bert22306   8/13/2014 5:08:51 PM
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The multiples of 4 (40, 400) is a leftover from telecom speeds. OC-768 is 40Gbps.

In truth, the only 4 related to SONET/STM was 40G. (Parenthetically, the scheme that used 4 and 16 was Token Ring, but that's neither here nor there.)

SONET/STM carriage is not a real issue anymore, as it might have been ca. mid 2000s and prior.

http://features.techworld.com/networking/1294/could-wan-ethernet-replace-sonet-and-atm/

http://www.tccomm.com/Literature/Default.aspx/Ethernet-Network-White-Papers/SONET-to-Ethernet-comparison

http://www.itproportal.com/2014/06/11/beyond-the-city-limits-how-ethernet-is-exceeding-the-metro-boundary/

The motivation to use SONET/STM at the physical layer has gone away, so I'm not sure why this 40G vestige from those days is being perpetuated by multiplying it by 10.

You'll note, even in the article, they're talking about 10 Tb/s in the future. Which says to me that the powers of 10 convention for Ethernet is still in people's minds.

MeasurementBlues
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Re: Why not an easier path to 1Tb/s
MeasurementBlues   8/13/2014 5:24:42 PM
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The use of 400Gbps is really an interim technology until 1Tbps links are developed. Of course, you could argue that every technology is animterim until something better comes along.

JSMITH1972
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Re: Why not an easier path to 1Tb/s
JSMITH1972   8/18/2014 3:27:16 PM
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Yes. 400Gbps can be viewed as interim until 1Tbps. 400Gbps is viable today given current technology and the economy of components.

JSMITH1972
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Re: Why not an easier path to 1Tb/s
JSMITH1972   8/18/2014 3:36:05 PM
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There is still a desire by many carriers to use OTN as the lower layer transport and keeping Ethernet aligned (as a multiple of 4) makes it nice to have an OUT container that an Ethernet payload will fit into.

JSMITH1972
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Re: Do we really need that 400G ?
JSMITH1972   8/18/2014 3:37:53 PM
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True! Facebook, Google and others are leading the demand to higher bandwidth.  400GE can be built today (relatively speaking) using existing key components that are also commercially feasible (i.e. have material costs that result in affordable Ethernet products). Jumping to 1TB any time before about CY2020 is not commercially feasible. It is important to remember that the IEEE develops standards that have to meet all five criteria:  Broad Market Potential, Compatibility, Distinct Identity, Technical Feasibility, and Economic Feasibility. 400GE can meet all 5, 1TB in the present day cannot.

JSMITH1972
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Re: Why not an easier path to 1Tb/s
JSMITH1972   8/18/2014 3:40:25 PM
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This goes back to commercial and technical feasibility. There are many issues just moving to 50Gb/SERDES, one of the major considerations is that, even today, there is no layer instrumentation to measure 50Gb/s signaling very well. Another example is just the move from 10Gb/s SERDES to 25Gb/s SERDES required the use of a next generation, more expensive printed circuit board material called Megtron 6. This is 2-3x more expensive than FR4. Moving to even higher SERDES might mean the use of Teflon-based materials at (10-15x more cost than FR4) or optical circuits which can be even more expensive than Teflon –based materials

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