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Duh!
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Duh!,
User Rank: Blogger
5/10/2019 | 3:40:26 PM
Re: Good one. Finally and hope the hype curve flattens soon and we can focus on real challenges and goals
I have to correct myself: Prop through fiber is 4.9 µs/km, not 98. Somehow my brain crossed Prop delay with attenuation. Max of 200 km to a data center is reasonable.

[imitates Emily Litella] Never mind.
Duh!
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Duh!,
User Rank: Blogger
5/10/2019 | 2:50:55 PM
Re: Good one. Finally and hope the hype curve flattens soon and we can focus on real challenges and goals
Seven,

The 10 ms is just for the one-way network portion of latency. Compute comes out of another piece of the end-to-end budget.

Dan
brooks7
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brooks7,
User Rank: Light Sabre
5/10/2019 | 1:52:39 PM
Re: Good one. Finally and hope the hype curve flattens soon and we can focus on real challenges and goals
Duh!,

I think you will find compute time is actually longer than you think...especially if any scale of data is involved that requires retrieval from a disk.

seven

 
Duh!
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50%
Duh!,
User Rank: Blogger
5/10/2019 | 1:35:45 PM
Re: Good one. Finally and hope the hype curve flattens soon and we can focus on real challenges and goals
That only counted first-order affectors. At >10 Gbit/s, all of those are in the noise.
brooks7
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brooks7,
User Rank: Light Sabre
5/10/2019 | 1:20:11 PM
Re: Good one. Finally and hope the hype curve flattens soon and we can focus on real challenges and goals
Duh!,

And that assumes that modulation delays and group delays are essentially 0.  This would mean that processing times are 0 as well.

seven

 
Duh!
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50%
Duh!,
User Rank: Blogger
5/10/2019 | 11:11:01 AM
Re: Good one. Finally and hope the hype curve flattens soon and we can focus on real challenges and goals
Propagation through fiber is a bit less than 100 µs per km, so 1 ms is a bit more than 10 km.  Does he claim that he has an existing data center within 10 km of every gNB (assuming that's where the micro-data center is collocated)?

But I agree that realistic use cases for <10 ms latency over 5G are few and far between.
komatineni
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komatineni,
User Rank: Lightning
5/9/2019 | 4:50:29 PM
Good one. Finally and hope the hype curve flattens soon and we can focus on real challenges and goals
"Deploying in tens-hundreds-thousands of micro-data centres would only improve latency by 1ms or less, and in some cases introduce latency depending on where the peering occurs"

This summarizes the challenge with EDGE compute or MEC. Cisco started talking about FOG at least five years ago and delivered a hardware platform that can be deployed. Did it revolutionize the industry? no not at all. Reason: What and where is the business case. Just like with NFV, the MEC hype with AR/VR/V2X/Tele-X/Cache/micro EPC hit a wall and now the focus appears to be on latency. But the 'packets' need to be sent somewhere be it via peering or service termination. The latency is important and sub 10ms is critical for some very unique and niche services that are offered in specific locations without much mobility needs. V2X touted as the killer app but still going with 5G-G5 battle. So, in the end, it's back to basics and hope we'd go back to solving real challenges. 


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