[149144] in North American Network Operators' Group
Re: LX sfp minimum range
daemon@ATHENA.MIT.EDU (Tom Storey)
Sun Jan 29 07:36:04 2012
In-Reply-To: <CAEGdXrMnM8W5qiwL1313EU4cvKgdcu9GgxuyoVhs3Ba9GCE_7Q@mail.gmail.com>
Date: Sun, 29 Jan 2012 12:35:40 +0000
From: Tom Storey <tom@snnap.net>
To: Pierre-Yves Maunier <nanog@maunier.org>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
I once tried an LX-SMF-MMF-LX type setup using mode conditioning patch
leads between the SMF-MMF and MMF-LX portions of the span. I would be
hesitant to recommend it, simply touching the patch lead on the MMF-LX
portion would result in horrendous error counts. Suffice to say, we bit the
bullet and got some SMF blown through (tubes ftw).
I have also used LX-LX on short SMF runs of a couple of metres, for 1G and
10G, with no issues.
On 27 January 2012 16:47, Pierre-Yves Maunier <nanog@maunier.org> wrote:
> 2012/1/27 Steven Tardy <sjt5@its.msstate.edu>
>
> > On 01/26/12 16:33, Pierre-Yves Maunier wrote:
> >
> >>
> >>
> >> It can happends that SX works on singlemode but it can fail anytime.
> >>
> >> just because you can doesn't mean you should.
> >
> > we have experience multiple cases where LX-MMF-LX works great for 3-5+
> > years...
> > then one day no longer gets link. swapping to a different fiber pair
> > restores link.
> > can't remember SX-MMF-SX failing after years of service.
> >
> >
> That's why I wrote 'but it can fail anytime' meaning, I strongly recommand
> to NOT do it.
>
>
> --
> Pierre-Yves Maunier
>
