https://www.gbic-shop.de/de/produkte/transceiver/sfp/kompatibel-6/1000base-sx/zyxel-sfp-sx-detail.html The SFP transceivers are hot-pluggable devices and are also very compact. The SFP stands for Small Form Pluggable and has a great utility in the data communication and telecommunication.
DGS-3420-28SC for 20 SFP ports + 4 Combo 1000Base-T/SFP ports + 4 10GE SFP+ Switch Moduel well tested with one year warranty
24 Port 10/100 Base T/TX Managed Stackable Switch + 2 SFP/RJ-45 Dual Media Ports
HP V1910-48G Ethernet Switch - 48 Port - 4 Slot - 48 x 10/100/1000Base-T - 4 x SFP (mini-GBIC) Slot by HP. $625.00. HP V1910-48G Ethernet Switch - 48 Port - 4 Slot - 48 x 10/100/1000Base-T - 4 x SFP (mini-GBIC) Slot
Cisco Compatible 1000BASE-EX SFP, To light up the world with Cisco Catalyst 3650 Series