A MODEM ENERGY CONSERVATION METHOD USED IN A DATA COMMUNICATION SYSTEM, THAT HAS A STRUCTURE (101), AND A MODEM (103), THE MODEM REGISTERED WITH THE INFRASTRUCTURE AND ADAPTED TO PROVIDE DATA COMMUNICATIONS BETWEEN A MAIN TERMINAL ( 105) AND THE INFRASTRUCTURE (101). THE METHOD INCLUDES THE STEPS OF RECEIVING, IN THE MODEM (103), A MESSAGE, DETERMINING THAT THE MESSAGE IS NOT SENDABLE TO THE MAIN TERMINAL, AND RESPONDING IN THE SAME TO THE ENTRY IN MODEM OF AN ENERGY CONSERVATION MODE. AN ALTERNATIVE METHOD DIRECTED TO THE SAME PURPOSES INCLUDES THE STEPS OF ENTERING, IN THE MODEM (103), A MODE OF CONSERVATION OF ENERGY AFTER IT HAS BEEN TRANSFERRED FOR A FIRST DEFAULT TIME WITHOUT ACTIVITY OF MESSAGES, EXPULING FROM AFTER THAT THERE HAS BEEN A SECOND DEFAULT TIME, AND FINALLY RECORDING IT WITH THE INFRASTRUCTURE.
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