Patent ID: 7346785
Filing Date: 2008-03-18
Classification: G06F,H02G,H04L

Abstract:
1. A computer for use in a local area network the computer comprising: a memory located within the computer; a non-essential circuitry located within the computer; a first internal power supply located within the computer and arranged to supply power to said memory and said non-essential circuitry, said first internal power supply being fed power from an electrical mains; a second internal power supply located within the computer and arranged to power said memory, said second internal power supply being fed a limited power insufficient to power both said memory and said non-essential circuitry, said limited power received via communication cabling from an external power source, said communication cabling comprising pairs of twisted copper wires at least one of which is arranged to transmit both said received limited power and data for the computer; and a controller receiving a control input from said first internal power supply indicative of said mains fed power availability, said controller being operative, responsive to said control input indicating that said mains fed power of said first internal power supply is not available, to supply power to said memory from said second internal power supply, said non-essential circuitry not being powered by said second internal power supply.