Each Fibre NIC card has two ports for transceivers. Without the transceiver, your fiber cable will not be able to connect to the NIC card. The number of transceivers required will depend on your Storinator configuration. If you purchase one NIC card, you would buy 1-2 transceivers. If you buy two NIC cards, you can opt to have 1-4 transceivers. We recommend at least one transceiver per NIC, whether purchased through 45 Drives or another source of your choosing.
Please note: Copper NIC cards do not require transceivers.