发明名称 |
CIRCUIT AND METHOD FOR SIMULATION OF A TELEPHONE APPARATUS |
摘要 |
An electric device (202, 301) for connecting an analogue data transfer device (202) by means of a control unit (203) to a digital transfer system comprises means for connecting to a data transfer device via a twin cable (204). In addition, it comprises a current amplifier arrangement (214, 314, 340) for feeding a certain current to the twin cable, a first current switching device (219) for switching a first control current to the current amplifier arrangement, and a second current switching device (220) for switching a second control current to the current amplifier arrangement. The current switching devices (219, 220) are preferably current mirrors. |
申请公布号 |
WO9959327(A3) |
申请公布日期 |
2000.02.10 |
申请号 |
WO1999FI00396 |
申请日期 |
1999.05.11 |
申请人 |
TELLABS OY;HURME, HARRI;TAMMINEN, TIMO, M.;KOSKELA, JARI |
发明人 |
HURME, HARRI;TAMMINEN, TIMO, M.;KOSKELA, JARI |
分类号 |
H04M1/738;H04M3/00;H04M3/32 |
主分类号 |
H04M1/738 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|