Post #1275561
2026-03-24 12:47 UTC
@manawyrm @ann3nova do you need attenuators if you have an especially short run of cable between transceivers or can they just deal with ~full tx power arriving at their rx port?
Unless I fumbled 100m of an OS2 cable (assuming 0.4dB/1km) with LC/APC connectors (assuming 0.2dB insertion loss) at both ends only attenuates to about 90% of the input power
Replies (1)
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@manawyrm@chaos.social 2026-03-24 13:07
@hcsch @ann3nova They can deal with it. This is well specified in the datasheet of the transceivers: https://resource.fs.com/mall/resource/sfp-1g34-bx10-datasheet-20251208090113.pdf Average Output Power POUT: -9 to -3 dBm Input Saturation Power P(SAT): -3 dBm Receiver Damage Threshold: +3 dBm So yeah, in other words: No problem, even a direct no-loss 10cm link would be (barely) in spec.