Siemens 6GK1970–5CA20–0AA2 Instructions De Montage page 296

SIMATIC NET PROFIBUS Plastic Fiber Optic
Other commercially available accessories
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Sharp scissors for shortening the Kevlar and the fibers
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Sharp knife for separating the duplex cords
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Clean, soft cloth for cleaning the polishing discs and the connector end face.
Installation Instructions for BFOC Connectors
Page 12