Method for indicating charge status of backup power supply and communication device employing the same

Abstract

A method for indicating the charge status of a backup power supply of a communication device includes detecting the charge status of the backup power supply. If the charge status of the backup power supply is lower than or equal to a predetermined charge status, the communication device alerts via a telephone connected thereto. The communication device alerts a user by sounding one or more tones if the telephone is off-hook, and alerts user by sounding one or more rings if the telephone is on-hook.

1 . A method for indicating a charge status of a backup power supply of a communication device, comprising:
 detecting a charge status of the backup power supply; and   alerting via a telephone connected to the communication device if the charge status of the backup power supply is lower than or equal to a predetermined charge status;   wherein the alerting comprises alerting a user by sounding one or more tones if the telephone is in an off-hook state.   
     
     
         2 . The method as described in  claim 1 , further comprising alerting the user by sounding one or more rings if the telephone is in an on-hook state. 
     
     
         3 . The method as described in  claim 2 , wherein the telephone communicates and connects directly to the communication device via a cable. 
     
     
         4 . The method as described in  claim 1 , wherein the communication device sends a charge status message of the backup power supply in a caller identification (ID) format to the telephone. 
     
     
         5 . The method as described in  claim 4 , wherein the charge status message is displayed on a display of the telephone in the caller ID format. 
     
     
         6 . A communication device, comprising:
 a primary power supply providing electrical power for the communication device to operate;   a backup power supply providing electrical power for the communication device to operate when the primary power supply stops supplying electrical power;   a first detection module detecting a charge status of the backup power supply of the communication device;   a second detection module detecting whether a telephone connected to the communication device is in an off-hook state; and   a telephone module altering via the telephone if the charge status of the backup power supply is lower than or equal to a predetermined charge status;   wherein the alerting comprises alerting a user by sounding one or more tones if the telephone is in off-hook state.   
     
     
         7 . The communication device as described in  claim 6 , wherein the telephone module alerts the user by sounding one or more rings if the telephone is in an on-hook state. 
     
     
         8 . The communication device as described in  claim 7 , wherein the communication device sends a charge status message of the backup power supply in a caller identification (ID) format to the telephone. 
     
     
         9 . The communication device as described in  claim 8 , wherein the telephone communicates and connects directly to the communication device via a cable. 
     
     
         10 . The communication device as described in  claim 6 , wherein the communication device sends a charge status message of the backup power supply in a caller identification (ID) format to the telephone. 
     
     
         11 . The communication device as described in  claim 10 , wherein the charge status message is displayed on a display of the telephone in the caller ID format.