H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/68
H04M 11/00 (2006.01) H04M 19/08 (2006.01) H04Q 1/30 (2006.01) H04Q 1/36 (2006.01) H04Q 3/42 (2006.01)
Patent
CA 1308825
Abstract of the Disclosure A terminal repeater placed in at least one communi- cation line connecting an exchange and at least one terminal device, comprising a DC cut-off circuit providing continuous paths for AC signals flowing through the lines while providing discontinuous paths for DC signals flowing through the communication line, a DC power supply circuit generating a DC power used in place of a DC power supplied through communication line from the exchange, and supplying the generated DC power to terminal device, a DC loop signal detecting circuit comparing a threshold level with a level of a DC loop signal as is transmitted from the terminal device to the exchange, and generating a signal corresponding to the DC loop signal, and a pseudo-DC loop signal transmitting circuit, when the DC loop signal detecting circuit generates a signal, the pseudo-DC loop signal transmitt- ing circuit controlling a C state of the communication line in accordance with the signal generated by the DC loop signal detecting circuit, thereby to transmit a pseudo-DC loop signal analogous to the DC loop signal detected by the DC loop signal detecting circuit.
600916
Kabushiki Kaisha Toshiba
Marks & Clerk
LandOfFree
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