[AusNOG] DSL G.Fast Details

[Mark ZZZ Smith]

I don't care as much as to whether it is active or passive optical - symmetric bandwidth is the key. But hey, asymmetric bandwidth sounds right for residential so it must be right (despite TCP being ACK clocked and delayed ACKs due to queuing on the lower bandwidth upstream direction reducing throughput in the downstream direction ... which is what RFC3449 explains, and BCP89/RFC3819, "Advice for Internet Subnetwork Designers" further states.). Perhaps this is one of the best examples of people following their intuition rather than how things would actually best work.
IEEE EPON is better, none of this 'we need to provide legacy ATM and T1 services', because, well, the IEEE invented Ethernet, and if that is all the network is going to carry ....
Even if Google are using GPON, they're still using it to provide symmetric bandwidth:
Google Fiber’s Brewing Little Secret Exposed: It’s GPON!

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| Google Fiber’s Brewing Little Secret Exposed: It’s GPON!Summary Bullets: Google Fiber’s use of GPON, instead of active/P2P Ethernet FTTH, while somewhat shocking at first, is not surprising upon further examination, as G... |
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| View on networkmatter.com | Preview by Yahoo |
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      From: James Andrewartha <trs80 at ucc.gu.uwa.edu.au>
 To: Mark ZZZ Smith <markzzzsmith at yahoo.com.au> 
Cc: Mark Delany <g2x at juliet.emu.st>; "ausnog at lists.ausnog.net" <ausnog at lists.ausnog.net> 
 Sent: Saturday, 7 February 2015, 20:38
 Subject: Re: [AusNOG] DSL G.Fast Details
   
On Tue, 3 Feb 2015, Mark ZZZ Smith wrote:

> * I agree it should be the end game if you going to deploy FTTP. Google 
> got it right - symmetric active FTTP is the real end game if you're 
> going to go to the expense of deploying fibre (as its all going to carry 
> Internet traffic and, as described in RFC3449, the best links to carry 
> Internet protocols over, and more specifically TCP, are symmetric ones.)

Is Google Fiber active ethernet? [1] claims that apart from one legacy 
network it bought for $1 they use GPON, and their Network Engineer job [2] 
lists "Familiarity with GPON and optical fiber access technologies."

[1] http://networkmatter.com/2014/02/27/google-fibers-brewing-little-secret-exposed-its-gpon/


[2] https://www.google.com/about/careers/search#!t=jo&jid=200001

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