nanog mailing list archives
Re: Advice/Experience with small sized DDWM gear
From: fkittred () gwi net
Date: Thu, 07 Aug 2003 16:26:10 -0400
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
Current thread:
- Re: Advice/Experience with small sized DDWM gear fkittred (Aug 07)
- Re: Advice/Experience with small sized DDWM gear N. Richard Solis (Aug 07)