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Analog switch multiplexes SFP modules

Posted: 01 Feb 2011     Print Version  Bookmark and Share

Keywords:Small-form-factor pluggable modules  physical-layer  MAX4572 

Small-form-factor pluggable modules (SFP modules) are in common use for the physical-layer interface in telecom and data communications equipment. Also common in these systems is an I2C bus for the MDIO interface (Management Data Input/Output). Sadly, when several SFP modules are used they all have the same I2C address, so they cannot all connect to the same I2C bus.

To avoid multiple I2C bus masters in that situation, you can introduce an I2C-controlled analog switch (MAX4572), which directs the data line to the appropriate SFP module.

View the PDF document for more information.

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