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ZKTel is major in SFP, range from 155M to 10G, with 1310nm,1550nm

- Apr 29, 2016 -

The small form-factor pluggable (SFP) is a compact, hot-pluggable transceiver used for both telecommunication and data communications applications. The form factor and electrical interface are specified by a multi-source agreement (MSA). It interfaces a network device motherboard (for a switchroutermedia converter or similar device) to a fiber optic or coppernetworking cable. It is a popular industry format jointly developed and supported by many network component vendors.[1] SFP transceivers are designed to support SONETgigabit EthernetFibre Channel, and other communications standards. Due to its smaller size, SFP obsolesces the formerly ubiquitous gigabit interface converter (GBIC); the SFP is sometimes referred to as a Mini-GBIC. In fact, no device with this name has ever been defined in the MSAs.

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). SFP modules are commonly available in several different categories:

  • 1 to 2.5 Gbit/s multi-mode fiber, LC connector, with black or beige[1] 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)[3]

  • 1 to 2.5 Gbit/s single-mode fiber, LC connector, with blue[1] extraction lever

    • LX - 1310 nm, for distances up to 10 km

    • EX - 1310 nm, for distances up to 40 km [4]

    • ZX - 1550 nm, for distances up to 80 km (depending on fiber path loss), with green extraction lever (see GLC-ZX-SM1) [4]

    • EZX - 1550 nm, for distances up to 160 km (depending on fiber path loss) [4]

    • 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.[5][6] Variations of bidirectional SFPs are also manufactured which use 1550 nm in one direction, and higher transmit power versions with link length capabilities up to 80 km.

    • 1550 nm 40 km (XD), 80 km (ZX), 120 km (EX or EZX)

    • SFSW – Single Fiber Single Wavelength transceivers, for bi-directional traffic on a single fiber. Coupled with CWDM, these double the traffic density of fiber links.[7][8]

    • CWDM and DWDM transceivers at various wavelengths achieving various maximum distances

  • 1 Gbit/s for copper twisted pair cabling, 8P8C (RJ-45) connector

    • 1000BASE-T - these modules incorporate significant interface circuitry[9] 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) Fiber channel or SONET. Unlike non-SFP, copper 1000BASE-T ports integrated into most routers and switches, 1000BASE-T SFPs usually cannot operate at 100BASE-TX speeds.

  • 100 Mbit/s copper and optical - some vendors have shipped 100 Mbit/s limited SFPs for fiber to the home applications and drop-in replacement of legacy100BASE-FX circuits. These are relatively uncommon and can be easily confused with 1 Gbit/s SFPs

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