Features of Cisco GLC-LH-SM Optics . The GLC-LH-SM, can be used and interchanged on a wide variety of Cisco products and can be mixed in combinations of 1000BASE-SX, 1000BASE-LX/LH, or 1000BASE-ZX on a port-to-port basis Cisco Catalyst 6500 or 7600 Series Supervisor Engine 720. . The industry-standard Cisco Small Form-Factor Pluggable (SFP) Gigabit Interface Converter