SFP, SFP+ and QSFP+ are all types of transceivers used in networking equipment to transmit and receive data. The main difference between them lies in their data transfer rates, size, and the type of connections they support.

1.SFP (Small Form-Factor Pluggable): SFP transceivers support data rates of up to 10 Gbps and are commonly used in applications like Gigabit Ethernet, Fibre Channel, and SONET/SDH. They have a small form factor and use LC fiber optic connectors or RJ-45 copper connectors.

2. SFP+ (Enhanced Small Form-Factor Pluggable): SFP+ transceivers support data rates of up to 10 Gbps and can also reach speeds of 16 Gbps or 32 Gbps. They are backwards-compatible with SFP ports and are commonly used in 10 Gigabit Ethernet, 8G Fibre Channel, and other high-speed networking applications.

3. QSFP+ (Quad Small Form-Factor Pluggable): QSFP+ transceivers support data rates of up to 40 Gbps and can also support 100 Gbps using four lanes of 25 Gbps each. They have a larger form factor compared to SFP and SFP+ and are used in high-speed networking applications such as 40 Gigabit Ethernet, QDR InfiniBand, and 40G/100G Fibre Channel.

In summary, SFP supports data rates of up to 10 Gbps, SFP+ supports up to 16 Gbps or 32 Gbps, and QSFP+ supports up to 40 Gbps or 100 Gbps. Additionally, the form factor and the type of connections they support also differ between these transceiver types.