gearlinkoptic
https://www.gearlinkoptic.com/products/sfp-1.25g-850nm-550m-lc-transceiver/
GearLink's gigabit optical transceiver GCS1L0C85 is used in Gigabit Ethernet, dual-channel, and bidirectional transmission synchronous optical network (SONET). GCS1L0C85 conforms to SFP multi-source protocol and SFF-8472, with digital diagnostic monitoring(DDM) function. The package of GCS1L0C85 is SFP with LC interface, the rate is 1.25G, the optical wavelength is 850NM, and the maximum transmission distance is 550m.
Compatibility of SFP 1.25G 850nm 550m LC Transceiver
GLC-SX-MMD 1000BASE-SX SFP 850nm 550m
GLC-SX-MMD-RGD 1000BASE-SX SFP 850nm 550m
ONS-SC-GE-SX 1000BASE-SX SFP 850nm 550m
WS-G5484 1000BASE-SX MMF 850nm 550m GBIC
SFP-GE-S 1000BASE-SX SFP 850nm 550m
GLC-SX-MM 1000BASE-SX SFP 850nm 550m
Technical Specification Of SFP 1.25G 850nm 550m LC Transceiver
Absolute Maximum Ratings of 1.25G 850nm 550m LC Transceiver