[60368] in North American Network Operators' Group
Re: Advice/Experience with small sized DDWM gear
daemon@ATHENA.MIT.EDU (fkittred@gwi.net)
Thu Aug 7 16:28:33 2003
To: deepak@ai.net
Cc: "Arman" <arman@unitedlayer.com>, nanog@merit.edu
From: fkittred@gwi.net
In-Reply-To: Your message of "Fri, 20 Jun 2003 14:56:41 EDT."
<GPEOJKGHAMKFIOMAGMDIAEPFONAB.deepak@ai.net>
Date: Thu, 07 Aug 2003 16:26:10 -0400
Errors-To: owner-nanog-outgoing@merit.edu
On Fri, 20 Jun 2003 14:56:41 -0400 "Deepak Jain" wrote:
> > Nanogers,
> >
> > We are looking for advice/experience from folks who has used small 6-8
> > Wavelength DDWM.
> >
> > Also what are the pros and cons of CDWM and DDWM?
> >
> > Application; 5 Mile Dark Fiber between two carrier neutral hotels in SF.
> >
> > All help is appreciated and results will be shared if requested.
> >
>
> Arman,
>
> I think the biggest difference between small DWDM and CWDM is how much
> growth room you need.
>
> If you need 8 wavelengths (possibly 16 is still called CWDM but I doubt
> it)
> you can stay on the CWDM side. The lasers and the gear is generally cheaper.
>
> With DWDM gear everything seems to be more expensive, but you get a lot
> more control as the electronics governing the chassis' tend to be much more
> advanced. On a short run like that, many advanced features like all-optical
> amplification and such are not necessary. I am not aware of any all-optical
> CWDM amplifiers yet. (for example).
>
> If you are planning more than just 1 DF run, you could buy the less
> expensive solution and just swap it out when you need something more and use
> the CWDM solution somewhere else.
>
> If you have decent/modern fiber, you should be able to comfortable sign
> al
> 8 waves x 1G or 8 x 2.5G (full duplex). Some DWDM gear will let you double
> that on just 8 colors by going full duplex on each fiber (each thread).
>
> So its a question of how much BW you need and how much you want to pay
> for right now.
>
> (If I am wrong, someone please correct me).
>
> Hope this helps, let me know what you decide.
I would be interested in recommendations for specific hardware. We
are looking at longer runs and the units must be NEBS compliant as the
nodes are in telco COs.
thanks,
fletcher
