I'm not sure there is much difference in 1310nm (single-mode) between 2km and 20km (maybe 2km to 40km) it might just be different labels/marketing fluff
On Mon, Dec 2, 2024 at 7:05 PM Jim Bouse [Brazos WiFi] <j...@brazoswifi.com> wrote: > Different frequency light has different loss per km. > > Jim > > > > Sent via the Samsung Galaxy S22+ 5G, an AT&T 5G smartphone > > > > -------- Original message -------- > From: Adam Moffett <dmmoff...@gmail.com> > Date: 12/2/24 9:02 PM (GMT-06:00) > To: AnimalFarm Microwave Users Group <af@af.afmug.com> > Subject: [AFMUG] Optics light budget > > Help me understand this: > > 20km transceiver (SFP+ CWDM) > https://www.fs.com/products/38707.html?now_cid=65 > Max Tx power +6dBm. Rx sensitivity -14.4dBm. So a power budget of 20.4dB > > 40km transceiver (SFP+ CWDM > https://www.fs.com/products/15385.html?now_cid=65 > Max Tx power +5dBm. Rx sensitivity -15dBm. So a power budget of 20dB. > > What am I missing? These seem roughly equivalent. What makes one of > them more appropriate for the 40km distance? > I looked at Precision OT as well. Their 40km CWDM SFP+ has a power budget > of about 20dB, and they don't even make a 20km one. Could this be kind of > like CPUs where the 20km ones are just 40's that didn't test well? > > -Adam > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > -- Thank you, TJ Trout Volt Broadband 209.480.3122 Cell
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