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(Small Form-factor Pluggable) A small transceiver that plugs into the SFP port of a network switch and connects to Fibre Channel and Gigabit Ethernet (GbE) optical fiber cables at the other end. Superseding the GBIC transceiver, SFP modules are also called "mini-GBIC" due to their smaller size. By choosing the appropriate SFP module, the same electrical port on the switch can connect to fibers of different wavelengths and types (multimode or singlemode). If the fiber is upgraded, the SFP module is replaced.

The SFP converts the serial electrical signals to serial optical signals and vice versa. SFP modules are hot swappable and contain ID and system information for the switch.

Combo SFP Ports
Combo ports are paired with Ethernet ports. For example, if an SFP transceiver is plugged into SFP port 24, then Ethernet port 24 is disabled even if a cable is plugged in.

10 Gigabit Support (SFP+ and XFP)
XFP transceivers were created to handle 10 Gigabit optical lines, because SFP supported only 4.25 Gbps. The same module size as SFP, SFP+ was later introduced to handle 10 Gbps but required more circuitry in the host device. As a result, SFP+ ports are mostly found in plug-in cards for servers and enterprise switches. See transceiver and GBIC.

SFP+ and XFP (10 Gigabit)
Both supporting 10 Gigabit Ethernet, the SFP+ module (left) is narrower and shorter than the XFP module (right). A cable can plug into SFP+ at one end and XFP at the other. (Image courtesy of Cisco Systems, Inc.)
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Perle SFP and XFP Optical Transceivers can adapt devices to any existing network.
This ultrasmall, low power transceiver has been standardized by the XFP multi-source agreement group to allow communication equipment manufacturers to design high port-density 10 Gbps optical line cards at lower costs.
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The last three letters of the car's registration are believed to be XFP or XPF.
Its new XFP 2000 product is selling well, at about a quarter-million dollars each, though the recession has slowed sales somewhat.
Leveraging the company's proprietary high speed ICs and its extensive expertise in optical networking and system design, Menara's portfolio of OTN XFP, SFP+ and CFP modules provide optical networks with superior performance and improved service velocity while drastically reducing floor space, power consumption and overall network cost.
Shenzhen, China, August 14, 2013 --(PR.com)-- FiberStore Co., Ltd., a vertically integrated optical Ethernet transport specialist and provider of "System-in-a module" portfolio of OTN pluggable transceivers that simplify IP and Ethernet optical transport, introduces the 50G Hz DWDM XFP 40/80 km small factor 10Gb/s transceivers which is comply with the current (MSA) specification.
With the software, you can conduct several types of measurements, including DWDM analysis; DFB, FP-LD, LED, and EDFA analysis; and optical module analysis such as XFP and SFP+ directly from the touch screen.
It is a Layer 3 routing switch that sports 24 1000Base-X SFP ports and eight 10GBase-X XFP ports, and includes two built-in FAST stacking ports in a 1.5RU form factor incorporating redundant power supplies.
The NP-3 EZappliance is a 1U stand-alone or rack-mountable system with 24 Gigabit Ethernet SFP ports and two 10-Gigabit XFP ports, and features full redundancy including swappable AC/DC power supplies, fan tray and filter tray.
Catering to the needs of global telecom operators, network system integrators and distributors, Aspen Optics product line includes MetroBlazerao switches, concentrators and media converters, as well as Geebic branded SFP, GBIC, XFP and other next generation optical transceivers.