| 摘要 |
PURPOSE:To attain the monitor and test at a proper signal level by adopting the structure in which each signal level from both remote and near end terminal equipments is arranged to be an uniform level by using two 2/4-wire conversion circuits and the signal is branched and outputted. CONSTITUTION:A low level signal coming from a remote end terminal equipment A appears at a 4-wire output 4WS of a 2/4-wire conversion circuit Ha and is given to an amplifier AMP without being subject to attenuation. On the other hand, a high level signal coming from a near end terminal equipment a appears at the 4-wire output 4WS of a 2/4-wire conversion circuit Hb and is given to a 4-wire input 4WR of the said 2/4 conversion circuit Ha, subjected to large attenuation in the inside of the conversion circuit Ha, the result appears at the 4-wire output 4WS and is inputted to the said AMP. Thus, even if there is a difference in the signal level between the remote end terminal equipment A and the near end terminal equipment B, the signal from each terminal equipment outputted from a branch output terminal O is arranged to a uniform level. |
