| 8369510 |
Method and apparatus for ringing |
— |
2013-02-05 |
| 7813500 |
Method and apparatus for ringing |
— |
2010-10-12 |
| 7630490 |
Method and apparatus for DC feed |
Jin Li |
2009-12-08 |
| 6990191 |
Method and apparatus for handling voice and data signals |
Jeffrey J. Anderson, Walter S. Schopfer |
2006-01-24 |
| 6865269 |
Method and apparatus for switch hook detection |
Jin Li |
2005-03-08 |
| 6058161 |
System and method for programmable telephone subscriber line test |
Jeffrey J. Anderson, Yan Zhou |
2000-05-02 |
| 5963159 |
Arrangement and method for controlling gain of analog-to-digital converters |
Firas N. Abughazaleh, Vijayakumaran V. Nair, Michael Stibila |
1999-10-05 |
| 5956386 |
Telephone subscriber line diagnostics system and method |
— |
1999-09-21 |
| 5675271 |
Extended chip select reset apparatus and method |
Imran Baqai |
1997-10-07 |
| 5452345 |
Metering signal level control circuit |
Yan Zhou, V. Vijayakumaran Nair, Sergio R. Ramirez |
1995-09-19 |
| 4860285 |
Master/slave synchronizer |
Dale E. Gulick |
1989-08-22 |