SFP Transceiver Types

Posted on Jun 21, 2010 in Knowledge Base

SFP Transceiver Types

SFP transceiver is available with a variety of 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
  • 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.

SFP sockets are found in Ethernet switches and network interface cards. Storage interface cards, also called HBAs or Fibre Channel storage switches, also make use of these modules, supporting different speeds such as 2Gb, 4Gb, and 8Gb. Because of their low cost, low profile, and ability to provide a connection to different types of optical fiber, SFP provides such equipment with enhanced flexibility.

Above are the common SFP transceiver types which we may use in some deployments, for more details of SFP transceivers, you may have a visit the article “What is SFP”.