Cisco 1000BASE-SX SFP (SFP-GE-S) only for multimode fiber.

The Cisco Gigabit Interface Converter 1000BASE-SX SFP (SFP-GE-S) only supports multimode fiber 1000BASE-SX standard IEEE 802.3z

The Cisco Gigabit Interface Converter 1000BASE-SX SFP (SFP-GE-S) only supports multimode fiber 1000BASE-SX standard IEEE 802.3z, operating in multimode fiber links of up to 550 meters and 50um multimode fiber FDDI grade 62.5 um to 200 meters. It can support up to 1000 meters on a multimode fiber optimized for laser 50um.

The specifications of the Cisco Gigabit Interface Converter 1000BASE-SX SFP (SFP-GE-S) are:

http://www.cisco.com/en/US/prod/collateral/modules/ps5455/ps6577/product_data_sheet0900aecd8033f885/

The module Cisco 1000BASE-SX SFP product has a number of SFP-GE-S.