[184641] in North American Network Operators' Group
Re: GPON Optical Levels
daemon@ATHENA.MIT.EDU (Florian Lohoff)
Tue Oct 13 09:25:42 2015
X-Original-To: nanog@nanog.org
Date: Tue, 13 Oct 2015 15:06:53 +0200
From: Florian Lohoff <f@zz.de>
To: Baldur Norddahl <baldur.norddahl@gmail.com>
In-Reply-To: <CAPkb-7ADK0qoq8X99s-+zvocYASCmsFHwdv5L+YkjiZs7E4Y9Q@mail.gmail.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
--Yylu36WmvOXNoKYn
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable
On Mon, Oct 12, 2015 at 10:46:59PM +0200, Baldur Norddahl wrote:
> Here is a small secret: If you attenuate the PON port so the signal level
> at the OLT is as low as possible, your network will be more robust against
> people connecting P2P fiber media converters to your network. This is
> because these devices typically have TX power that is significantly less
> than your ONUs. By attenuate the signal you can bring the rogue signal
> below the detection threshold of the OLT.
>=20
> In my experience one way to do this is to always use 1:128 splits. Even if
> you are only going to connect less than 32 ONUs, you will find that 1:128
> can be more robust. In fact I discovered this little trick after we start=
ed
> using 1:128 splits (for flexibility, not because we actually connect that
> many clients). Because the fiber plant is shared with other service
Wouldnt a 1:32 splitter + a 9dB attenuation be the same? From
the price/performance the 1:128 splitter should be much more expensive.
We have seen happening the same converting a former p2p footprint to
GPON and somebody got a left over p2p device connected. But this was
a single incident so far.
Flo
--=20
Florian Lohoff f@zz.de
We need to self-defend - GnuPG/PGP enable your email today!
--Yylu36WmvOXNoKYn
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: Digital signature
Content-Disposition: inline
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.10 (GNU/Linux)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=sTsC
-----END PGP SIGNATURE-----
--Yylu36WmvOXNoKYn--
