Merit Network
Can't find what you're looking for? Search the Mail Archives.
  About Merit   Services   Network   Resources & Support   Network Research   News   Events   Home

Discussion Communities: Merit Network Email List Archives

North American Network Operators Group

Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical

Re: Advice/Experience with small sized DDWM gear

  • From: fkittred
  • Date: Thu Aug 07 16:29:59 2003

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.


Discussion Communities

About Merit | Services | Network | Resources & Support | Network Research
News | Events | Contact | Site Map | Merit Network Home

Merit Network, Inc.