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What is the maximum power consumption of SFP?
Knowledge Base + 2024.01.10

The maximum power consumption of SFP (Small Form-Factor Pluggable) modules can vary depending on the specific type of SFP module, its features, and the technology used. SFP modules are available for various applications, including Ethernet, Fiber Channel, and other communication standards, each with its own set of specifications. 


As of my last knowledge update in January 2022, the power consumption of an SFP module is typically specified in the module's datasheet. Here are some general considerations:

  1. Low-Power SFP (LPSFP):

    • Some SFP modules are designed as low-power variants, and they are often labeled as "LPSFP" or "Low Power SFP." These modules are optimized for reduced power consumption compared to standard SFP modules.

  2. Power Classes:

    • SFP modules are often classified into different power classes, such as Class 1, Class 2, and so on. These classes correspond to different power consumption levels, and the specific class designation is mentioned in the module's datasheet.

  3. Distance and Data Rate:

    • The power consumption of an SFP module may be influenced by factors such as the supported data rate and the distance over which it is transmitting. Modules designed for longer distances or higher data rates may consume more power.

  4. Digital Diagnostics (DDM/DDMI):

    • SFP modules with Digital Diagnostics Monitoring (DDM) or Digital Diagnostic Monitoring Interface (DDMI) capabilities may have slightly higher power consumption due to the additional electronics for monitoring and reporting parameters like temperature and optical power.

To obtain accurate information about the maximum power consumption of a specific SFP module, it is essential to refer to the module's datasheet provided by the manufacturer. The datasheet will provide detailed information about the electrical characteristics, power consumption, and other relevant specifications.

Since technology evolves, it's advisable to check the latest documentation and specifications for the most up-to-date information, especially if you are working with recently released SFP modules.

How  to Choose an Ethernet SFP Module?

Choose  SFP Copper or Fiber Module?

SFP  module comes in various types on the basis of different classification  standards. It works with copper Ethernet cables or fiber optical cables.

On  the fiber optics side, there are single mode SFP module and multimode SFP  module, which allows users to select the appropriate transceiver according to  the required optical range for the network. Operation wavelength ranges from  850nm to 1550nm. Commonly, 850nm SFP can reach up to 550 meters with multimode  fiber optics, and the 1550nm SFP supports up to a maximum of 160km via single  mode fiber cables. On the other hand, copper SFP modules primarily  are 1000BASE-T  SFP and 1000BASE-TX SFP modules, which are excellent used in  gigabit Ethernet networking within 100 meters.

More  about Types of SFP transceivers

Choose  SFP or Advanced SFP+?

SFP  and SFP+ are applied at different transmission speeds. SFP module supports 1Gb  data rate, and the SFP type includes 1000base-T/TX, 1000base-SX,  1000base-LX/LX10, 1000base-BX10, 1000base-LX/LH, 1000base-EX, 1000base-ZX and so  on.

SFP+  is used in 10-gigabit Ethernet applications but shares the same form factor with  SFP. In the SFP+ family, there are primarily SFP+ SR, SFP+ LR, and SFP+ ZR  modules for 10 Gigabit ethernet networking.

More  about SFP  vs Advanced SFP+/SFP28/QSFP/QSFP28

Choose  an MSA Compatible SFP or Not?

Compatibility  is often the most important parameter users care about when buying an MSA SFP  module. MSA (multi-source agreement) is an agreement supported by a number of  manufacturers who came together to collaborate and standardize the fit-form and  try to provide a reliable mean of mixing and matching SFP brands successfully.  Third-party companies also have developed their own tools to program SFP modules  to be compatible with the OEM. So, the MSA compatibility Gigabit SFP module can  be used successfully in most networks.

FAQs  about SFP Transceiver

Can  We Use SFP Hardware in SFP+ Slots?

In  many cases, the SFP+ port accepts SFP optics, but the speed will be down to 1G  instead of 10G. However, SFP+ optics can not be plugged into the SFP port,  because SFP+ does not support speed under 1G. In addition, almost all SFP+ ports  on Cisco switches can support SFPs, but many SFP+ ports of Brocade switch only  support SFP+ optics.

Can  I use a 1000base-LX sfp for 1000base-SX fiber?

Generally,  they are not interchangeable. 1000Base SX and LX are two optics standards with  different operation wavelengths.1000Base LX SFP transceiver usually operates at  1310nm and uses single-mode fiber to connect, while 1000Base-SX usually is 850nm  SFP and works with multimode fiber.

Can  you aggregate multiple SFP ports?

Of  course, you can. Link aggregation provides benefits like increased bandwidth,  redundancy, and load-balancing. That will ensure that one link can immediately  switch to a second available link when it fails. Therefore, aggregation on SFP  ports is critical for enterprise networks where performance and security are  more important. But note that, before connecting the SFP ports, please make sure  that the switches have been configured for link aggregation. Otherwise, it will  cause network loops.