Pre-embedded fiber splicing point is inside of the connector, there is matching oil; straight-trough type splicing point is on the surface, no pre-set matching oil, connect fiber directly through the adapter. During assembly, no need glue dispensing and polish. Connect. A fiber fast connector, also known as a mechanical splice or cold connector, is a field-installable connector that terminates fiber optic cables without requiring a fusion splicer. An optical fiber connector enables quicker connection and disconnection than splicing.