QSFP (Quad Small Form-factor Pluggable) and SFP (Small Form-factor Pluggable) transceivers are both types of optical transceivers used in high-speed network applications. The key features of QSFP and SFP transceivers include:

1.Form Factor: QSFP transceivers are larger in size and offer higher port density compared to SFP transceivers. QSFP transceivers have four separate transmit and receive channels, while SFP transceivers have one transmit and one receive channel.

2. Data Rate: QSFP transceivers typically support higher data rates compared to SFP transceivers. QSFP transceivers can support data rates of 10G, 25G, 40G, and 100G, while SFP transceivers are commonly used for data rates of 1G, 10G, and 25G.

3. Interface: QSFP transceivers use a QSFP interface, which includes 4 channels of data transmission, while SFP transceivers use an LC (Lucent Connector) interface for data transmission.

4. Distance: Both QSFP and SFP transceivers are available in various distance options, including short-reach, long-reach, and extended-reach. The distance supported by a transceiver depends on the type of fiber optic cable used and the type of transceiver module.

5. Power Consumption: QSFP transceivers generally consume more power compared to SFP transceivers due to their higher data rate and larger size.

6. Application: QSFP transceivers are commonly used in high-density data center applications, such as switch-to-switch and switch-to-server connections, while SFP transceivers are used in a wide range of applications including Ethernet, Fibre Channel, and SONET/SDH.

Overall, the key features of QSFP and SFP transceivers include their form factor, data rate, interface, distance, power consumption, and application. Both transceivers offer flexibility and scalability for high-speed network connections, with QSFP transceivers being suitable for high-density applications and SFP transceivers being more versatile for various networking needs.