| 6192421 |
Program-controlled device with reloading possibility for and changeover possibility to a second operating system without program interruption by exchanging two address lines each other |
— |
2001-02-20 |
| 5003588 |
Circuit arrangement for protecting electronic interface circuit of subscriber line circuits |
— |
1991-03-26 |
| 4905227 |
Circuit for subscriber line interface circuits in a digital time-division multiplex communication switching center |
Robert Lechner |
1990-02-27 |
| 4893309 |
Digital interface between at least two subscriber line interface circuits and a processing unit |
Robert Lechner, Hans-Werner Rudolf, Harald Stader, Christopher C. A. Priest, Nigel P. Dyer +7 more |
1990-01-09 |
| 4881226 |
Digital interface of an integrated subscriber line interface circuit |
Robert Lechner, Hans-Werner Rudolf, Harald Stader, Christopher C. A. Priest, Nigel P. Dyer +7 more |
1989-11-14 |
| 4858226 |
Method for the operation of an interface circuit between a central portion and local portions of a subscriber termination module of a digital time multiplex telecommunications network |
Hans-Werner Rudolf, Harald Stader, Robert Lechner |
1989-08-15 |
| 4809258 |
Circuit arrangement for the indication of loop closure during the ringing condition |
Robert Lechner |
1989-02-28 |