Cisco SFP Modules for Gigabit Ethernet Applications Data Sheet - Cisco
Gigabit Single Mode SFP Transceiver for Cisco GLC-LH-SMD, 1000Base-LX/LH Mini GBIC, 1.25G SFP LC Fiber Module, 1310nm SMF, up to 20km, for Cisco, Meraki, Ubiquiti UF-SM-1G and More : Amazon.co.uk: Computers &
Cisco GLC-LH-SM-20 1000BASE-LX/LH SFP (mini-GBIC) Transceiver - FS.com United Kingdom