| 摘要 |
A system and method for providing on-demand battery backup to cable telephony devices comprising converting AC main power to DC power 102, charging a battery 104, providing regulated power to the cable modem device 106, detecting the presence of AC main power 108, providing a signal to the cable modem device to indicate that AC main power is not present 110, detecting said signal by said cable modem device 112, entering sleep mode and disabling said telephony interface 114, exiting sleep mode and enabling a telephony interface by said cable modem device upon activation of said cable telephony device 116, and signaling telephony service availability by said cable modem device 118.
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