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| Number | Title | Issue Date |
| 5138658 | Subscriber line interface circuit providing regulated current A subscriber line interface circuit that provides regulated current to telephone subscribers in an improved manner reducing the amount of power required to operate while maintaining a constant current source. The current to the telephone subscribers flows... | 08/11/1992 |
| 5133006 | Combination interface circuit for coupling a digital loop carrier telephone system A telephone interface circuit for use in a digital loop carrier system. A transformer for coupling analog information and a switch responsive to a hook condition signal is provided. The hook condition signal provides an indication of the "on/off hook" con... | 07/21/1992 |
| 5119379 | Method and apparatus for fault reporting A method and apparatus for reporting faults on a control line running through a plurality of processors to a control processor. Each processor having a failure provides a unique address onto the control line. The addresses are then sequentially shifted th... | 06/02/1992 |
| 4980887 | Digital communication apparatus and method A T1 digital carrier system having a transmitter, receiver and a plurality of intermediate repeater stages. Each remote repeater has a select switch for automatically selecting that the remote repeater be placed in loop-back mode should a combination of f... | 12/25/1990 |
