[AusNOG] 10GBase-T SFP modules?

[Beeson, Ayden]

I'd disagree; we are looking at installing it not for single user performance, but for multi-user throughput, particularly in semi-dense or dense deployment areas.

A single user has no use (right now) for that sort of bandwidth, but you start throwing a few users on w/ high bitrate applications and the beam forming allows you to realise a lot more of that theoretical bandwidth than before in large deployments.

Even with 80 MHz channels (which you can use those restricted ones if you have the radios that are certified for it with DFS and TPC, giving a total of 4 usable IIRC) you can easily make over 1gbps per user with the multiple streams.

They can also do some cool stuff with split 160 MHz channels, allowing them to join 80 MHz blocks in a staggered fashion to create alternate channels to reduce overlap, but you are still right, it's unlikely to see use in the enterprise space.

As for the 10gbps ports, watch this space, a lot will change in the next few years, we are on the cusp of a new network refresh and will definitely be looking to design for wave 2. Our current 11n wireless is saturated pretty much 99% of the time by student traffic already.

I know a few manufacturers have a lot more 10Gbase-T stuff about to come out, some of them a lot more access focused....

Power wise, you would be hard pressed to find new POE gear these days that didn't do 802.3at. The equipment we are installing now in the interim is 3850 UPOE switches, which can do a full 60w per port. Older deployments will obviously have problems there, but I don't expect many people will be installing AC wave 2 wireless radios without some thought to upgrading the wired equipment behind it anyway....

I definitely agree, it's a niche market at the moment but I think we will all be shocked how quick the ac deployments ramp up once wave 2 drops and there is a compelling reason to upgrade...

Heaps of good info in this btw:
http://www.cisco.com/c/en/us/products/collateral/wireless/aironet-3600-series/white_paper_c11-713103.html#_Toc331821649

Disclaimer - Obviously wave 2 could turn out to not meet any of these expectations, it's hard to say seeing as I don't have any of the gear yet but for now, it looks useful to me and something we are definitely planning for.

Thanks,
Ayden Beeson


-----Original Message-----
From: James Andrewartha [mailto:trs80 at ucc.gu.uwa.edu.au]
Sent: Thursday, 10 July 2014 1:18 PM
To: Beeson, Ayden
Cc: Skeeve Stevens; Lincoln Dale; <ausnog at lists.ausnog.net>
Subject: RE: [AusNOG] 10GBase-T SFP modules?

On Thu, 10 Jul 2014, Beeson, Ayden wrote:

> Agreed, with Wave 1 it's basically a "nice to have" at the most, in a lot of cases, fairly redundant.

I was talking about wave 2.

> Wave 2 will change that though, with theoretical speeds going much
> higher with 160 MHz channels and beamforming to allow 3+ Gbps.

There's a single 160Mhz channel available, no enterprise is going to use it. There's only two 80MHz channels that aren't affected by weather radar.
So real business deployments will use 40MHz channels to avoid channel overlap.

> The AP will absolutely need to deliver more than 1gbps to reach
> anywhere near its speed allowances, even if that bandwidth is spread
> across multiple users.

And what applications need those speed allowances?

Don't get me wrong, I think the PHY improvements in 802.11ac are great for increased speed, but I can hardly see the need to cater for > 1Gbps real througput. I don't see companies paying four times the price for 10GBASE-T switches just so their APs can gain marginal improvements in peak performance.

Recent Wave 1 APs have reduced power enough to fit into 802.3af, but I bet Wave 2 will require 802.3at for 4SS, which a large amount of the installed base of switches don't support. PoE over 10GBASE-T isn't even ratified yet from what I can tell, although it does work OK according to this report from May: http://www.ieee802.org/3/bt/public/may14/darshan_2_0514.pdf

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