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Thomas Edison ; 1889
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| Number | Title | Issue Date |
| 4021618 | Intra link calling within a subscriber digital system Disclosed is a feature for use in a subscriber digital multiplexer interfacing between a central telecommunications office (CO) and a plurality of remote terminals, each remote terminal serving a number of subscribers. Calls from and to lines at the same ... | 05/03/1977 |
| 4001514 | Subscriber digital multiplexing system with time division concentration A digital multiplexer for transmitting control, signaling and speech information in digital form between a central telecommunications office (CO) and a plurality of remote terminals. The system serves a plurality of lines at the exchange and couples those... | 01/04/1977 |
