On Mon, 4 Dec 2017, Joel Wirāmu Pauling wrote:
How to deliver a switch, when the wiring and port standard isn't
actually workable?
Not workable?
10GBase-T is out of Voltage Spec with SFP+ ; you can get copper SFP+
Yep, the "Cu SFP" was a luxury for a while. Physics is harsh mistress
though.
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).
I have CAT6 in my home, and not more than 30 meters anywhere. So it would
work for me. You need CAT6e for 100M, so anyone doing new installs should
use that. Stiff cable, though.
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.
With that distance, you could probably run 10GE over CAT3 wiring. So there
is a reason 10GE requires more for longer distances, because it's bad
cable so instead you need lots of power and DSPs to figure out what's
going on.
--
Mikael Abrahamsson email: swm...@swm.pp.se
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