Turn any switch into a mini RFTS (Remote Fiber Test System).
Just plug a few Smart SFP OTDRs into existing equipment.
Or build it from scratch based on a 5-port switch plus a few Smart SFP OTDRs.

Smart SFP OTDR plus BiDi SFP

In data transmission mode, Smart SFP OTDR can work with any BiDi SFP.Replace SFP on one side and get fiber fault monitoring capability.