The difference between SFP+ module and SFP28 Transceiver

Optical module is a compact device that is used a lot in the network system with the task of being a very efficient signal transceiver with one end connecting to devices such as Switch, Router, Media Converter, … and the other end connecting connect to devices like Switch, Router, Media Converter, etc. connect to copper or fiber optic networks. Optical modules are classified mainly based on criteria such as speed, optical fiber, optical cable, etc. It is a compact but indispensable device in the network system.

There are many different types of optical modules on the market for each specific use. But the most popular are the SFP+ module and the SFP28 Transceiver. Each type has different production technology, features and advantages and disadvantages. So how are these two different, which is better, which is more durable? For those who do not have much experience in network engineering, this is a difficult question. The following article will help you compare SFP28 vs SFP + to find the most suitable one for your needs. Let’s consult now.

What is SFP+ 10G optical module?

SFP+ is an upgraded version of SFP, it is developed based on the SFF-8431 technique. SFP+ was first announced on May 9, 2006, and is currently one of the most commonly used module types today. The SFP+ features a signal amplifier that is extremely suitable for use in areas with poor signals. The transmission rate of SFP+ is 10G, SFP+ is capable of supporting data rates up to 16Gbs. In most applications today, SFP+ optical modules generally support 8 Gbit/s Fiber Channel, 10 Gigabit Ethernet and OTU2. Compared to previous 10 Gigabit Ethernet XENPAK or XFP modules, the SFP+ module is smaller and becomes the most popular 10 Gigabit Ethernet module on the market.

sfp+ pic
sfp+ series

Features and benefits of SFP+ module

  • Easy to use, easy to replace
  • Low price

What is the SFP28 25G optical module?

The SFP28 25G has a technical name of Small Form-Factor Pluggable 28. It is manufactured based on IEEE 802.3by specification (25GBASE-CR) and is the third generation of the SFP interconnect system. for 25G performance. Compared with SFP+ modules, SFP28 25G is an enhanced version that allows user units to transmit better signals. It has a maximum support distance of up to 40km and in the future this number will be more and more. The SFP28 25G can be connected to a wide variety of cables ranging from single-mode fiber, active fiber or even direct-mount copper.


Features and benefits of 25G SFP28 optical module

  • Compatible with other IEEE compatible 25G interfaces where available
  • Certified and tested on Cisco SFP28 ports for outstanding performance, quality, and reliability
  • IEEE 802.3by and IEEE 802.3cc compliant high-speed connectivity
  • Cost savings. Because when you use SFP28, you will have less network switches and cables

SFP28 vs SFP+, what’s the difference?

According to the development history, SFP28 is a newer generation of modules than SFP+, so it has more advantages in signal transmission. Regarding the terms of construction and design, these two types of modules are the same, have the same pinout and they are compatible with each other. The basic difference between SFP28 and SFP+ is that SFP+ can operate at a maximum speed of 10 Gb/s while SFP28 is 25 Gb/s. This means that the SFP28 transmits signals faster, with less interference.

Regarding the module structure, SFP28 is added with CDR circuit (Clock Data Recovery) to help increase data transmission speed from 10Gbit / s to 25 Gbit / s.In addition, network experts also rate SFP28 copper cable with greater bandwidth than SFP+ cable, it also has a longer lifespan and less damage than SFP+ cable. SFP28 is a more advanced version than SFP+. It has the same popular form factor as its sibling, but supports speeds up to 25Gb/s on a single lane.

 When using the SFP28, you have a new way to upgrade your network and many options: 10G-25G-40G-100G. Compared to SFP+, SFP28 is an energy-efficient solution to meet the growing needs of next-generation data center networks.

SFP+ was put into use before SFP28 was born, so many users wondered if it was easy to switch from SFP+ to SFP28. The answer is quite easy. The SFP28 is designed for backward compatibility with SFP+ ports and full functionality. SFP+ cables can also be plugged into the top of the SFP28 module, however it will not be able to achieve the 25Gb/s transfer rate.

So SFP28 is completely dominant? Not quite. SFP+ is better than SFP28 in its coverage capacity. While the maximum transmission distance of SFP28 is 40mk, in SFP+, this number is up to 120km.

Another controversial issue about the SFP28 optical module is compatibility. However, it has been verified and clearly answered. In the era of network information explosion, SFP28 and other modules with broadband and fast data transmission speed will be increasingly popular. We are gradually entering the 5G phase, everyone wants to access information quickly and easily. This does not mean that and SFP+ will be obsolete. Each type has its own advantages and disadvantages that no other type can replace.


Currently, many companies tend to use SFP28 instead of SFP+ to save power and costs. It is also considered the ideal solution for future Ethernet and server upgrades. As you can see, the need to exchange information is increasing day by day. Successful people always get information quickly and accurately. Therefore, the role of these devices is increasingly important.

Above is the comparative information about the two optical modules SFP+ module and SFP28 Transceiver, hope they are useful to you. Inside these two types of Modules are also divided into many different types with diverse specifications. They are suitable for each use and structure of the equipment used. If you are still wondering which type to use for yourself, consider the factors of intended use, information transmission requirements and desired coverage distance.