[160249] in North American Network Operators' Group
Re: Fwd: Rollup: Small City Municipal Broadband
daemon@ATHENA.MIT.EDU (Scott Helms)
Sat Feb 2 21:31:26 2013
In-Reply-To: <CAGbD49r3+C7mOErm===DrtNzJmYx4s28gZaPgkz+cqq4Ado-eg@mail.gmail.com>
Date: Sat, 2 Feb 2013 21:29:23 -0500
From: Scott Helms <khelms@zcorum.com>
To: Jason Baugher <jason@thebaughers.com>
Cc: NANOG <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Jason,
Yeah, that's what I figured. There are lots of older PON deployments that
used the modulated RF approach.
On Sat, Feb 2, 2013 at 9:03 PM, Jason Baugher <jason@thebaughers.com> wrote:
>
> On Feb 2, 2013 3:33 PM, "Scott Helms" <khelms@zcorum.com> wrote:
> >
> ......
>
> > This is not correct. DOCSIS is an MPEG stream over QAM or QPSK
> modulation
> > and there is nothing about it that is compatible to any flavor of PON.
> In
> > fact if you look at the various CableLabs standards you'll see DPoE (
> > http://www.cablelabs.com/dpoe/specifications/index.html) which lists
> how a
> > DOCSIS system can inter-operate and provision an PON system. If you look
> at
>
> Jay may be referring to something I alluded to earlier, what Calix refers
> to as RF overlay. The RF signal from the traditional cable system is
> converted to 1550nm and combined onto the PON before the splitter with a
> CWDM module. Certain model ONT's split the 1550 back off and convert back
> to an RF port.
>
--
Scott Helms
Vice President of Technology
ZCorum
(678) 507-5000
--------------------------------
http://twitter.com/kscotthelms
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