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
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