PCB Design Glossary
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FR-4 is a designation for the most common dielectrics used in a printed circuit board. It describes woven fiberglass and epoxy substrate that is Fire Resistant.
The FR4 designator can be applied to a wide array of laminates.
In full-duplex communication, data is able to move bi-directionally during a data transaction. Both nodes are capable of simultaneous transmit/receive.