Distance is an issue as well. 80 km DWDM are cheaper than 80 km CWDM, but short CWDM is cheaper than short DWDM.
----- Mike Hammett Intelligent Computing Solutions Midwest Internet Exchange The Brothers WISP ----- Original Message ----- From: dmmoff...@gmail.com To: "AnimalFarm Microwave Users Group" <af@af.afmug.com> Sent: Tuesday, January 25, 2022 6:57:46 PM Subject: Re: [AFMUG] CWDM vs DWDM, Single Fiber vs Dual fiber My recollection is the DWDM optics are slightly cheaper, but the CWDM muxes are cheaper. I think if you fully populate the CWDM MUX then the cost was a wash and it didn’t matter which one you bought. If you are only ever going to use a few channels then CWDM is noticeably cheaper. The biggest hassle IMO is inventory and spares. If you’re using 10 different color optics then you need 10 different spares on the shelf. If you use 40 colors that cost $400 each then you need $16,000 in spare optics. That’s not even a bad scenario. Some of the more exotic optics are $2300 from Fiber Store. I have a quote in hand for 80km 100G Arista branded optics from another vendor for over $6000. If you’re using multiple colors of those then you may find yourself with a whole lotta capital tied up in spare parts. From: AF <af-boun...@af.afmug.com> On Behalf Of Carl Peterson Sent: Tuesday, January 25, 2022 4:43 PM To: AnimalFarm Microwave Users Group <af@af.afmug.com> Subject: [AFMUG] CWDM vs DWDM, Single Fiber vs Dual fiber We are leasing a few new strands of dark to a couple locations. On our other paths we have just Done BiDi for our ring or payload and used another for our routed/management network. For these strands, I'm thinking of doing passive WDM. Any benefit to DWDM vs CWDM if you aren't expecting to scale it? Why would you use two strands vs one strand? We generally use one strand for everything, either BiDi or GPON so my brain just sort of assumes that. What am I missing? -- https://www.fs.com/products/43711.html?attribute=4364&id=297095 -- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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