The term "SFP" typically refers to Small Form-Factor Pluggable, which is a compact and hot-pluggable transceiver used for communication in network and telecommunications equipment. SFP modules are commonly used in network switches, routers, and other networking devices.

The maximum speed of an SFP module depends on the specific type and standard it adheres to. There are various types of SFP modules, each designed for different communication standards and data rates. Here are some common SFP types and their maximum speeds:

1. SFP (1000BASE-X): This supports data rates up to 1 Gbps (Gigabit per second).

2. SFP+ (10GBASE-X): This supports data rates up to 10 Gbps.

3. SFP28 (25GBASE-X): This supports data rates up to 25 Gbps.

4. QSFP+ (Quad Small Form-Factor Pluggable Plus): This is not an SFP, but it's worth mentioning. QSFP+ supports data rates up to 40 Gbps.

5. QSFP28 (Quad Small Form-Factor Pluggable 28): This supports data rates up to 100 Gbps.

6. QSFP56 (Quad Small Form-Factor Pluggable 56): This supports data rates up to 200 Gbps.

It's important to note that the maximum speed is not solely determined by the SFP module itself but also by the networking equipment and the overall network infrastructure. Additionally, newer standards may have been developed since my last update in January 2022, so it's advisable to check the latest specifications and standards from reliable sources or the equipment manufacturers.