Tag Archives: optical transceiver

Understanding 100G QSFP28 and CFP

Today, as 100G Ethernet widely deployed and becoming an important part of the data center, network device developers are increasingly motivated to produce 100G optical transceiver. Moreover, the produced 100G optical transceiver must consume less space, achieve a lower price, and have better performance, such as QSFP28 modules and CFP modules. They are also the themes we are going to discuss today.

Overview of 100G QSFP28 and CFP

With the decline of the price, 100G optical transceivers are becoming more and more popular among customers. The 100G QSFP28 and CPF optical transceiver, as the main transmission medium of the 100G network, dominate the 100G hardware market. Then what are them?

100G QSFP28 Transceiver

QSFP28 is a hot-pluggable optical module designed for 100G data rate. It is considered the most promising 100G optical module because of its small size and low power consumption. This 100G module integrates 4 transmitting and 4 receiving channels, and each channel can send and receive data of 28Gbps at the highest. It has two main types: QSFP28 SR4 and LR4. The detailed specifications of these 100G transceiver modules like QSFP28 CWDM4, PSM4, ER4, etc., can be found in this article: Understand 100G Transceiver Transmission Principles.


Figure 1: QSFP28

CFP Optical Transceiver

The full name of CFP is C form-factor pluggable. In Roman numerals, the letter C denotes the number 100 (centum). The CFP module is defined by CFP MSA to support 40G, 100G and 400G applications. It includes pluggable CFP, CFP2 and CFP4 transceivers. CFP is the pioneer of 100G optical transceivers, which can do the 10x10G and 4x25G connection. However, the size of the original CFP is very large. In order to meet the data center for higher performance and higher density requirements, CFP2 and CFP4 were developed. The former size is only 1/2 of CFP, the latter is only 1/4.


Figure 2: CFP, CFP2, and CFP4

100G QSFP28 Vs. CFP: How They Differ From Each Other?

Here, we will introduce the differences between the two transceivers from four aspects: power consumption, port density, applications, and cost.

    • Power consumption: the power consumption of the QSFP28 transceiver is usually less than 3.5W, while the power consumption of the CFP module is usually 6W to 24W. Therefore, the power consumption of the former is much lower than that of the latter.
    • Port density: the first generation 100G transceiver is CFP transceiver, followed by CFP2 and CFP4. As mentioned above, the size of the CFP4 is only 1/4 of the CFP transceiver. But the size of the QSFP28 transceiver is less than CFP4, which means that the latter generation transceiver has a higher port density on the switch.
    • Applications: CFP, CFP2 and CFP4 transceiver modules can be used for 40G and 100G Ethernet, while QSFP28 can only be used for 100G Ethernet. However, when used in data centers, enterprise and service provider networks, CFP modules have not yet been widely adopted.
    • Cost: experience shows that the price of the CFP module is higher than that of QSFP28 module under the same transmission length. Let’s take the two transceivers of FS as an example: the price of Cisco QSFP-100G-SR4-S compatible 100GBASE-SR4 QSFP28 for 100 meters is just 99 dollars, but that of Cisco CFP-100G-SR10 compatible 100GBASE-SR10 CFP for 150 meters is 1500 dollars.


QSFP28 and CFP have so many advantages, but they are just two of the many solutions of 100G Ethernet. For the specific applications of data center and server room, specific problems need to be analyzed in detail. But we cannot deny that the two series optical modules have brought new solutions for 100G applications. They will rapidly promote 100G Ethernet development. If you have any questions or needs for the two optical modules, welcome to visit www.fs.com.

Fibre Channel SFP: Why Fibre Channel?

With the advent of SFP transceiver communication, there have been many different standards. In network hardware, the advantage of SFP transceivers is that they allow a single device, such as a switch, to support different cabling and transmission formats. However, when you try to find out which optical transceiver type you need, you will encounter problems. Because there are several different types of fiber SFP that can support a variety of communication standards, such as CWDM/DWDM, SONET, fibre channel, Fast Ethernet, and Gigabit Ethernet. Today we are going to introduce fibre channel SFP.

fibre channel sfp

Fibre Channel SFP

What Is Fibre Channel?

Fibre channel is a protocol mainly used for “storage area network”. Fibre channel speeds are different, ranging from 1, 2, 4, 8, 16Gbps to 128Gbps. Fibre channel is a lossless protocol developed when switches are not as reliable as they are now. When using Ethernet as a protocol, frames are discarded, which brings problems to applications such as data traffic. With the development of technology, switches are now becoming more reliable. However, fibre channels still have a small advantage over Ethernet in terms of consistency and latency.

What Is Fibre Channel SFP?

Fibre channel SFP transceivers is an important device for connecting fibre channel networks in data centers. It provides an interface between fibre channel system and SAN optical fiber. Fibre channel SFP transceiver is a common module in storage area network (SAN), which can provide 1, 2, 4, 8, 10, 16 and 20Gbps data transmission rate. Fibre channel SFP transceiver can be used for single-mode and multimode fiber applications.

Fibre Channel SFP: Why Fibre Channel?

Fibre channel, as a set of advanced data transmission standards, allows large amounts of data to be reliably moved at thousands of megabits between computers, servers, disk arrays, and other devices. Fibre channels are chosen for high-end storage connections because they have three main advantages: high speed, proven reliability, and guaranteed ordered packet transmission.

  • High speed: The original version of the fibre channel runs at the maximum data rate of 1Gbps. Now it can run at the rate of 128Gbps.
  • Proven reliability: fibre channels were initially accepted by almost all the world banks, Fortune 500 companies, and other organizations. These enterprises and organizations needed reliable and timely data transmission no matter how much it costs. Nowadays, the reliability of data transmission is still crucial. fibre channels are the most reliable for any enterprise or organization. Moreover, the choice of the fibre channel is not expensive.
  • Guaranteed in-order delivery: Fibre channel ensures that the raw block data is transmitted sequentially. Sequential delivery greatly improves network efficiency and is required by some applications, such as video streaming and IP streaming. Fibre channel naturally streams video frames sequentially, eliminating the bottleneck of reorganization. Otherwise, the frame speed per second required for video will be reduced seriously.


In summary, the advantages of fibre channel are still abundant, such as fast speed, reliability and sequential delivery, which is why we advocate fibre channel SFP. You can find high-quality FC SFP on FS.COM, such as 2G/4G FC SFP, 8G/10G FC SFP + module. Besides, we can also supply Gigabit SFP, 40G QSFP+ and 100G QSFP28. We offer a full range of branded and reasonably priced 100% compatible transceivers to meet your business need.