The distance that a 1310nm SFP (Small Form-Factor Pluggable) transceiver module can reach depends on the specific type and standard of the module. Different 1310nm SFP modules are designed for various applications and reach requirements. Here are some common types:

1. 1310nm SX (Short-Reach):

• Wavelength: 1310 nm

• Reach: Typically used for short-reach applications within a data center.

• Distance: Up to 2 kilometers (km).

2. 1310nm LX (Long-Reach):

• Wavelength: 1310 nm

• Reach: Designed for longer-reach connections in enterprise and metro networks.

• Distance: Up to 10 kilometers (km).

3. 1310nm LR (Long-Range):

• Wavelength: 1310 nm

• Reach: Intended for extended-range connections.

• Distance: Up to 40 kilometers (km) or more.

It's important to note that these are general categories, and the exact specifications, including reach, may vary between different manufacturers and specific implementations. When selecting a 1310nm SFP module for a particular application, you should refer to the datasheets and documentation provided by the module manufacturer for accurate information on the module's reach, wavelength, and compatibility.

Additionally, some 1310nm SFP modules may be part of standards like 1000BASE-LX, 10GBASE-LX4, or 10GBASE-LR, each with its own specifications regarding reach and application. Always consider the specific requirements of your network and choose the SFP module that aligns with those requirements.