Power management module and method for managing power supply

Power management module for managing power supply from a power sourcing equipment item to an associated apparatus, comprising:

• a connexion interface suitable for connecting said power management module to the associated apparatus;
• a processor configured to:
• estimate a power that the power management module is able to supply via the connexion interface;
• negotiate, based on the power estimated, the start-up of the associated apparatus in a power class, for negotiating the processor is further configured to supply power via the connexion interface;
• determine an updated power that the power management module is able to supply, when power is supplied to the associated apparatus;
• and
• re-negotiate the start-up of the associated apparatus based on the determined updated power,
• wherein estimating a power comprises predicting a voltage drop at the power management module based on the power class of the associated apparatus and on a voltage drop occurring between the power sourcing equipment and the connexion interface.