Battery switching in a telephone subscriber line interface circuit
First Claim
Patent Images
1. A telephone subscriber line interface circuit coupled to a telephone subscriber line, the telephone subscriber line interface circuit comprising:
- a first circuit portion;
a second circuit portion;
a first battery input for receiving a first battery voltage;
a second battery input for receiving a second battery voltage, the second battery voltage having a lower absolute value than the first battery voltage, and the second circuit portion being coupled to the second battery input;
a switch for coupling the first circuit portion to one of the first battery input when the switch is in a first state and the second battery input when the switch is in a second state; and
means for providing one of a first DC feed characteristic from the first battery input and a second DC feed characteristic from the second battery input to said telephone subscriber line coupled to said subscriber line interface circuit in accordance with the state of said switch.
5 Assignments
0 Petitions
Accused Products
Abstract
A telephone subscriber line interface circuit includes a first circuit portion and a second circuit portion, a first battery voltage and a second battery input for receiving a second battery voltage. The second circuit portion is coupled to the second battery input. The telephone subscriber line interface circuit further includes a switch for coupling the first circuit portion to one of the first battery input and the second battery input.
103 Citations
22 Claims
-
1. A telephone subscriber line interface circuit coupled to a telephone subscriber line, the telephone subscriber line interface circuit comprising:
-
a first circuit portion; a second circuit portion; a first battery input for receiving a first battery voltage; a second battery input for receiving a second battery voltage, the second battery voltage having a lower absolute value than the first battery voltage, and the second circuit portion being coupled to the second battery input; a switch for coupling the first circuit portion to one of the first battery input when the switch is in a first state and the second battery input when the switch is in a second state; and means for providing one of a first DC feed characteristic from the first battery input and a second DC feed characteristic from the second battery input to said telephone subscriber line coupled to said subscriber line interface circuit in accordance with the state of said switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A telephone subscriber line interface circuit coupled to a telephone subscriber line, the telephone subscriber line interface circuit comprising:
-
a first circuit portion; a second circuit portion; a first battery input for receiving a first battery voltage; a second battery input for receiving a second battery voltage, the second battery voltage having a lower absolute value than the first battery voltage, and the second circuit portion being coupled to the second battery input; a switch for coupling the first circuit portion to one of the first battery input when the switch is in a first state and the second battery input when the switch is in a second state; and an antisaturation circuit connected to limit amplifier swing to a range determined by line voltage, said antisaturation circuit comprising a battery dependent antisaturation circuit, a battery independent antisaturation circuit and a selector circuit; and means for providing one of a first DC feed characteristic from the first battery input and a second DC feed characteristic from the second battery input to said telephone subscriber line coupled to said subscriber line interface circuit in accordance with the state of said switch. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
-
Specification