The Cisco 1GBASE-ZR module supports link lengths of up to about 8 kilometers on standard SMF (G.652). This interface is not specified as part of the 1 Gigabit Ethernet standards and is, instead, built according to Cisco specifications. SFP-1G-ZR-S does not support FCoE. https://elecena.pl/product/30647735/cisco-sfp-10g-zr-s-sfp-10g-zr-s-network-transceiver-module-fiber-optic-10000 2026-09-01 https://elecena.pl/product/30647735/cisco-sfp-10g-zr-s-sfp-10g-zr-s-network-transceiver-module-fiber-optic-10000 2026-09-25