Singlemode Simplex Fiber Optical Cable with D4 Connector

Singlemode Simplex Fiber Optical Cable with D4 Connector

The NEC D4 was probably the first connector to use ceramic or hybrid ceramic/stainless steel ferrules. It uses a smaller ferrule than SCs or FCs. It was widely used in telco networks in the 80s to early 90s and some may still be in use.

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