1G SFP Transceivers (1000BASE-SX, LX, T)

SX, LX or T

The three types differ in medium and distance, so start from the cable already in place. Cisco's gigabit SFP data sheet gives these figures for its own modules:

Cisco requires an IEEE mode-conditioning patch cord whenever an LX/LH module runs over multimode fiber, whatever the span length.

Coding and where they fit

Buy the coding that matches the switch or NIC, because platforms such as Cisco's check it; the Juniper modules here use Juniper part numbers such as 740-011613 and 740-031851, and the Cisco ones Cisco's GLC numbers. Juniper-coded optics suit the Juniper switches we sell, Cisco-coded ones the Cisco switches, and the RJ45 copper modules put a twisted-pair connection on an SFP port.

For 10 Gb/s ports see 10GBASE-SR SFP+ transceivers, and for 40 Gb/s ports 40G QSFP+ transceivers; every speed is on optical transceivers, and the switches themselves on managed gigabit switches. An Enterasource warranty applies to every module, with the term on its listing.