As data centers and high-speed networks continue to evolve, the demand for faster and more efficient optical transceiver modules is increasing. Two popular options for 100 Gigabit Ethernet (100G) are CFP (C Form-factor Pluggable) and QSFP28 (Quad Small Form-factor Pluggable 28). Both modules provide high-speed data transmission capabilities, but there are differences in form factor, power consumption, reach, and compatibility. In this article, we will compare 100G CFP and QSFP28 modules, discussing their features, use cases, and considerations to help you determine when to use each module in your network deployments.
100G CFP:
The 100G CFP module is an early-generation form factor that has been widely adopted for 100G applications. It comes in two variants: CFP and CFP2. The CFP module is larger in size compared to the CFP2 module, but both provide the same data rate capabilities. The CFP module supports a maximum transmission distance of up to 40 kilometers (24.8 miles) over single-mode fiber (SMF) and offers various connectivity options, including SR10, LR4, and ER4. CFP modules consume relatively higher power compared to QSFP28 modules.
QSFP28:
QSFP28 is the next-generation form factor that provides a compact and low-power solution for 100G applications. It is an evolution of the earlier QSFP form factors, supporting data rates of up to 100Gbps. QSFP28 modules are significantly smaller in size compared to CFP modules, allowing for higher port density in networking equipment. They support a maximum transmission distance of up to 10 kilometers (6.2 miles) over SMF and offer various connectivity options such as SR4, LR4, and PSM4. QSFP28 modules consume lower power compared to CFP modules, making them more energy-efficient.
Use Cases and Considerations:
3.1. Form Factor and Port Density:
When considering form factor and port density requirements, QSFP28 modules have a significant advantage. Their smaller size allows for higher port density, making them ideal for scenarios where space is limited, such as high-density switches or blade servers. CFP modules, on the other hand, are suitable for applications where form factor and port density are not critical factors.
3.2. Power Consumption:
Power consumption is an important consideration for data center operators. QSFP28 modules consume lower power compared to CFP modules, which can lead to energy savings and reduced operating costs. If power efficiency is a key consideration for your network deployment, QSFP28 modules are a preferred choice.
3.3. Transmission Distance:
The transmission distance requirement of your network is another factor to consider. CFP modules support longer reach options, such as LR4 and ER4, which are suitable for long-haul applications. If your network requires transmission over longer distances, CFP modules may be the preferred option. QSFP28 modules, on the other hand, support shorter reach options like SR4 and LR4, which are more suitable for data center and campus environments.
3.4. Interoperability:
Interoperability is essential to ensure seamless communication between different modules and networking equipment. QSFP28 modules have gained widespread industry adoption and are compatible with a wide range of networking devices. CFP modules, being an earlier generation, may have limited interoperability with newer equipment, and it's important to verify compatibility with your specific networking environment.
3.5. Cost:
Cost is a crucial factor in network deployments. QSFP28 modules generally have a lower cost compared to CFP modules due to their smaller form factor and improved manufacturing processes. If cost optimization is a priority, QSFP28 modules offer a more cost-effective solution.
Conclusion:
Both 100G CFP and QSFP28 modules offer high-speed data transmission capabilities, but they differ in form factor, power consumption, reach, and compatibility. Consider the specific requirements of your network deployment, including form factor, power consumption, transmission distance, interoperability, and cost. For scenarios that demand high port density, lower power consumption, and compatibility with newer equipment, QSFP28 modules are a preferred choice. On the other hand, if long reach and interoperability with older networking devices are critical, CFP modules may be more suitable. Understanding these differences will help you make an informed decision when selecting between 100G CFP and QSFP28 modules for your network infrastructure.
