Can I use 40Km SFP for Fiber distance below 10Km ? I knew 10Km SFP is recommended, but putting aside costing, do I have any drawback using 40Km SFP in this environment ?
Yes and no.
In ideal condition, the answer is no, however, if forced with the issue please consider the risk of permanently burning out the optics of the already-expensive SFP.
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It depends on the optics. Some might be just fine, some could be damaged.
What you could do is use an attenuator to insure RX is within the spec range.
Yes you CAN, BUT
you must measure your RXlevel at both far ends. You need to procure sutable opitcal attenuators for both ends. it is likley that the optical losses are symmetrical , however it is best to testand not assume
look at the SFP input range, ensure that the incoming sigbal does not exceed the range.
the opitcal attenuators are placed at the far end RX link and NOT on the TX local link
you CAN destroy the SFP receiver
you may not drop enough db light than the RX will have no much db light, the RX reciever may die
you may drop too much db light than the RX may no see enough light. thus it wont work
thus you need to measure your RX db level at both far ends BEFORE you buy the correct opitcal attenuators