[38575] in North American Network Operators' Group
Re: POS OC48 interfaces using different wave length
daemon@ATHENA.MIT.EDU (Dalvenjah FoxFire)
Thu Jun 7 13:37:23 2001
X-Envelope-To: nanog@nanog.org
Date: Thu, 7 Jun 2001 10:36:27 -0700
From: Dalvenjah FoxFire <dalvenjah@DAL.NET>
To: Wayne Bouchard <web@typo.org>
Cc: Simon Lockhart <simonl@rd.bbc.co.uk>,
Vincent Gillet <vgi@opentransit.net>, nanog@nanog.org
Message-ID: <20010607103627.A19012@dragonlair.dal.net>
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In-Reply-To: <20010607100846.B66724@typo.org>; from web@typo.org on Thu, Jun 07, 2001 at 10:08:46AM -0700
Errors-To: owner-nanog-outgoing@merit.edu
Unless I've severely forgotten most of my physics classes, no; attenuators
reduce a signal's strength so as to not overload the input stage of the
receiver, if the signal is that strong; or, as mentioned later, to simulate
a long-distance run over a short length of fiber.
1310nm and 1550nm wavelengths are entirely different frequencies
(not amplitudes) of light. The only way to convert is to use an active
repeater that has the one type of transceiver on one side, and the other
on the opposite side, or to use Acme Singularity Inc's black hole with
ST connectors in a nifty in-line package to slow down the light wave
enough (and speed it up in the other direction) that it shifts
wavelengths. ( }:P )
-dalvenjah
On Thu, Jun 07, 2001 at 10:08:46AM -0700, Wayne Bouchard put this into my mailbox:
>
> So I guess the right answer here is that everyone needs to learn how
> to use attenuators propperly...
>
> On Thu, Jun 07, 2001 at 05:45:21PM +0100, Simon Lockhart wrote:
> >
> > >I am thinking about using different POS interfaces on dark-fibers.
> > >
> > >On one side, i already have POS-OC48-LR card (Cisco).
> > >This card use 1550 nm wave length.
> > >
> > >We would like to use a POS-OC48-SR (Cisco).
> > >This card use 1310 nm wave length.
> > >
> > >Are 1310 and 1550 optics comptatible ?
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