It stands for sealed maintenance free battery. You dont need to top up it.
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There should always be some type of bending loss in a fiber optic cable, whether it's a SMF or MMF cable. The reason for a bend loss being higher in SMF than MMF is that the core diameter of a SMF fiber can be significantly smaller than the core diameter of a MMF fiber, thus more of the light traveling down the SMF cable will hit the cladding at angles above the TIR angle, and more power will be lost.
Not really. These are two different types of fiber optic cable and are used for different reasons. In other words, you can't mix SMF and MMF fiber in the same cable, but they could be used in separate cables in the same network (although it isn't likely) MMF fiber is used for short haul interconnects, and SMF fiber is typically used for longer distances,
There are lots and types of battery
Its the CR2032 battery
It's what happens when a battery is about to expire.