[168596] in North American Network Operators' Group
Re: Is there such a thing as a 10GBase-T SFP+ transciever
daemon@ATHENA.MIT.EDU (Eric Clark)
Fri Jan 31 07:40:06 2014
From: Eric Clark <cabenth@gmail.com>
In-Reply-To: <52EB09B1.3040606@team.dcsi.net.au>
Date: Fri, 31 Jan 2014 04:39:48 -0800
To: Chris Balmain <chris@team.dcsi.net.au>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
What I want to see is reasonably priced 40G single mode transceivers.
I have no idea why 40G and now 100G wasn't rolled out with single mode =
as the preference. The argument that "there's a large multimode install =
base" doesn't hold water.
For one thing, you're using enormous amounts of MM fiber to get at best =
1/4 of the ports than you previously had.
The best case is that you could get 12 ports where you used to have 48, =
but that's messy.
The second issue is cost, if you're running and distance, you've got to =
go to OM4, because MM fiber has very limited range at 10G (you're =
multiplexing 10G links), and OM4 is insanely expensive.
Single Mode on the other hand is 'cheap' in comparison. One pair of SM =
fiber will handle every speed from 10M to 100G, and over much longer =
distances than MM, no matter what grade.
Unfortunately, since the manufacturers haven't seen fit to push the SM, =
the optics are extremely expensive, so we're stuck with 4-12 times the =
amount of installed fiber than we really need.
Grumble.
On Jan 30, 2014, at 6:25 PM, Chris Balmain <chris@team.dcsi.net.au> =
wrote:
> You may wish to consider twinax for short distance 10G over copper =
with SFP+ at both ends
>=20
> =
http://en.wikipedia.org/wiki/Twinaxial_cabling#SFP.2B_Direct-Attach_Copper=
_.2810GSFP.2BCu.29
>=20
> Typically marketed as "direct-attach" (you can't remove the cables =
from the transceivers, it's all integrated)
>=20
> On 31/01/14 12:26, james jones wrote:
>> I would like to know if anyone has seen one of these? If so where? =
Also if
>> they don't exist why? It would seem to me that it would make it a lot
>> easier to play mix and match with fiber in the DC if they did. Would =
be so
>> hard to make the 1G SFPs faster (trying to be funny here not =
arrogant).
>>=20
>>=20
>> -James
>=20
