[Cerowrt-devel] DC behaviors today
Joel Wirāmu Pauling
joel at aenertia.net
Mon Dec 4 05:27:19 EST 2017
How to deliver a switch, when the wiring and port standard isn't
10GBase-T is out of Voltage Spec with SFP+ ; you can get copper SFP+
but they are out of spec... 10GbaseT doesn't really work over Cat5e
more than a couple of meters (if you are lucky) and even Cat6 is only
rated at 30M... there is a reason no-one is producing Home Copper
switches and it's not just the NIC Silicon cost (that was a factor
until Recently obviously, but only part of the equation).
On the flip side:
Right now I am typing this via a 40gbit network, comprised of the
cheap and readily available Tb3 port - it's daisy chained and limited
to 6 ports, but right now it's easily the cheapest and most effective
port. Pitty that the fabled optical tb3 cables are damn expensive...
so you're limited to daisy-chains of 2m. They seem to have screwed the
pooch on the USB-C network standard quite badly - which looked so
promising, so for the moment Tb3 it is for me at least.
On 4 December 2017 at 23:18, Mikael Abrahamsson <swmike at swm.pp.se> wrote:
> On Mon, 4 Dec 2017, Joel Wirāmu Pauling wrote:
>> I'm not going to pretend that 1Gig isn't enough for most people. But I
>> refuse to believe it's the networks equivalent of a 10A power (20A
>> depending on where you live in the world) AC residential phase
>> distribution circuit.
> That's a good analogy. I actually believe it is, at least for the near 5-10
>> This isn't a question about what people need, it's more about what the
>> market can deliver. 10GPON (GPON-X) and others now make it a viable
>> service that can and is being deployed in residential and commercial
>> access networks.
> Well, you're sharing that bw with everybody else on that splitter. Sounds to
> me that the service being delivered over that would instead be in the 2-3
> gigabit/s range for the individual subscriber (this is what I typically see
> on equivalent shared mediums, that the top speed individual subscriptions
> are will be in the 20-40% of max theoretical speed the entire solution can
>> The problem is now that Retail Servicer Provider X can deliver a post
>> Gigabit service... what is capable of taking it off the ONU/CMNT point in
>> the home? As usual it's a follow the money question, once RSP's can deliver
>> Gbit+ they will need an ecosystem in the home to feed into it, and right now
>> there isn't a good technology platform that supports it; 10GBase-X/10GBaseT
>> is a non-starter due to the variability in home wiring - arguably the 7 year
>> leap from 100-1000mbit was easy It's mean a gap of 12 years and counting for
>> the same.. it's not just the NIC's and CPU's in the gateways it's the
>> connector and in-home wiring problems as well.
> As soon as one goes above 1GE, prices increases A LOT on everything
> involved. I doubt we'll see any 2.5G or higher speed equipment in wide use
> in home/SME in the next 5 years.
>> Blatant Plug - request :
>> I'm interested to hear opinions on this as I have a talk on this very
>> topic 'The long and Winding Road to 10Gbit+ in the home'
>> https://linux.conf.au/ at Linuxconf in January. In particular if you
>> have any home network gore/horror stories and photos you would be
>> happy for me to include in my talk, please include.
> I am still waiting for a decently priced 10GE switch. I can get 1GE 24port
> managed ones, fanless, for 100-200USD. As soon as I go 10GE, price jumps up
> a lot, and I get fans. The NICs aren't widely available, even though they're
> not the biggest problem. My in-house cabling can do 10GE, but I guess I'm an
> Mikael Abrahamsson email: swmike at swm.pp.se
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