With the increasing demand for higher bandwidth, multiple types of transceiver modules are designed for data transmission, including GBIC, SFP, SFP+, QSFP and so on. Well, what do GBIC, SFP, SFP+ and QSFP stand for? Among them, SFP has been used in popularity for over 15 years.
What Does SFP Stand for in Networking?
SFP stands for small form-factor pluggable. It is a compact, hot-swappable optical transceiver module that used in telecommunications and data communications networks. Instead of being standardized by official standards, SFP is specified by the multi-source agreement (MSA). MSA is an agreement between many different transceiver manufactures to make standardized products. So the SFP is compatible across a range of telecoms vendors’ hardware. And SFP module is designed to support synchronous optical networking (SONET), Gigabit Ethernet, fiber channel and other communication standards. In addition, SFP module can be categorized into various types under Gigabit Ethernet standards and industry-accepted standards, including 1000BASE-EX, 1000BASE-ZX, 1000BASE-SR and so on.
How to Use SFP Ports on Switch?
SFP port, a small form-factor hot pluggable interface, is used to extend switching functionality throughout the network. It enables Gigabit switches to allow both copper and optical links by inserting the corresponding Gigabit SFP module. And it is most commonly used for the uplink over either short and long transmission distances. There are several kinds of basic solutions:
- Fiber SFP – When SFP ports on switches are inserted into fiber SFP module with optical port, fiber optic cables (SMF fiber / MMF fiber) with duplex LC connector are needed to support the connection.
- SFP DAC/AOC – DAC consists of twinax copper cable with SFP DAC connectors on either end. AOC is defined as an fiber jumper cable terminated with SFP AOC connectors on either end. So the SFP DAC/AOC on the DAC/AOC cable can be inserted directly into the corresponding SFP ports on switch.
- 1000BASE-T Copper SFP – When the SFP ports are plugged by 1000BASE-T copper SFP with electrical port, the network cables such as Cat5e must be used for 1Gbit/s data transmission. What’s more, it is ideal for short reach distance less than 100m.
- BiDi SFP – Unlike traditional optical transceivers, BiDi SFP module is fitted with wavelength division multiplexing (WDM) diplexers. It combines and separates data transmitted over a single fiber based on the wavelengths of the light. So It has only one port to transmit and receive optical information on separate wavelength and supports a transmission distance up to 120km.