Convert and extend a gigabit ethernet connection up to 248 miles40 km over single mode sc fiber the et91000sm402 1000 mbps gigabit single mode fiber media converter sc 40 km lets you extend a gigabit ethernet network over single mode fiber by up to 40km 25 miles a cost effective solution for connecting a gigabit ethernet 1000base t network to remote network segments over a 1000base lxsx fiber backbone the gbe to sm fiber converter supports full gigabit speeds for ideal network p