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!
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.
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.
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.
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