Types
SFP transceivers are available with a variety of transmitter and receiver types, allowing users to select the appropriate transceiver for each link to provide the required optical reach over the available optical fiber type (e.g. multi-mode fiber or single-mode fiber). Optical SFP modules are commonly available in several different categories:
- for multi-mode fiber, with black or beige extraction lever
- SX - 850 nm, for a maximum of 550 m at 1.25 Gbit/s (Gigabit Ethernet) or 150m at 4.25 Gbit/s (Fibre Channel)
- for single-mode fiber, with blue extraction lever
- LX - 1310 nm, for distances up to 10 km
- BX - 1490 nm/1310 nm, Single Fiber Bi-Directional Gigabit SFP Transceivers, paired as BS-U and BS-D for Uplink and Downlink respectively, also for distances up to 10 km. Variations of bidirectional SFPs are also manufactured which use 1550 nm in one direction.
- 1550 nm 40 km (XD), 80 km (ZX), 120 km (EX or EZX)
- CWDM and DWDM transceivers at various wavelengths achieving various maximum distances
- for copper twisted pair cabling
- 1000BASE-T - these modules incorporate significant interface circuitry and can only be used for Gigabit Ethernet, as that is the interface they implement. They are not compatible with (or rather: do not have equivalents for) Fibre channel or SONET.
Read more about this topic: Small Form-factor Pluggable Transceiver
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