Termination device for a telephone line
View Patent ↗A termination device for a telephone line of a wire based telephone system, said termination device ( 30 ) comprising: a high pass filter ( 39 ) for separating signals within a frequency band used by a high-speed modem ( 13 ) for data transmission; and impedance means ( 53 ) connected to the high-pass filter ( 39 ), wherein said impedance means ( 53 ) has an impedance which matches the impedance of the telephone line in the frequency band used by the high-speed modem ( 13 ).
1. A termination device for a telephone line of a wire based telephone system, said termination device comprising:
a high-pass filter for separating signals within a frequency band used by a high-speed modem for data transmission;
an impedance connected to the high-pass filter, wherein said impedance includes an impedance value which matches the impedance of the telephone line in the frequency band used by the high-speed modem for data transmission; and
a low-pass filter having a variable cut-off frequency, wherein the termination device includes first and second line-side terminals for connecting to a telephone line, wherein the high-pass filter is connected across the first and second line-side terminals, and wherein the impedance is connected across the high-pass filter.
2. The termination device according to claim 1 , wherein the low-pass filter is configured to separate a telephone voice signal transmitted within a low frequency band.
3. The termination device according to claim 1 , wherein the impedance value of said impedance is asymptotically resistive.
4. The termination device according to claim 3 , wherein the impedance includes a resistor.
5. The termination device according to claim 2 , wherein the low-pass filter and the high-pass filter are passive filters.
6. The termination device according to claim 1 , wherein the cut-off frequency of the high-pass filter is about 1 MHz.
7. The termination device according to claim 2 , wherein the low-pass filter and the high-pass filter are active filters.
8. The termination device according to claim 2 , wherein the low frequency band includes a POTS-frequency band ranging from 0 Hz to about 4 kHz.
9. The termination device according to claim 1 , wherein the high-speed modem includes an xDSL-modem.
10. The termination device according to claim 9 , wherein the xDSL-modem includes a VDSL-modem.
11. The termination device according to claim 1 , wherein the frequency band used by the high-speed modem comprises a data downstream frequency band and a data upstream frequency band.
12. The termination device according to claim 11 , wherein the data downstream frequency band ranges from about 0.9 MHz to about 3.5 MHz and the data upstream frequency band ranges from about 4 MHz to about 7.9 MHz.
13. The termination device according to claim 2 , wherein the low-pass filter includes an output terminal for connecting a telephone set to the termination device.
14. The termination device according to claim 2 , wherein the low-pass filter and the high-pass filter are connected in parallel to each other and to an input terminal of the termination device.
15. The termination device according to claim 1 , wherein the telephone line comprises unshielded twisted-pair-cable (UTP).
16. The termination device according to claim 14 , wherein the high-pass filter is switched automatically to the input terminal when no telephone set is connected to the termination device.
17. The termination device according to claim 14 , wherein the termination device includes a detector configured to detect whether a telephone set is connected to the termination device and being further configured to control a switching unit to connect the high-pass filter to the input terminal in case that no telephone set is connected to the termination device.
18. The termination device according to claim 1 , wherein the impedance value of said impedance is adjustable.
19. The termination device according to claim 1 , wherein the termination device is configured to be integrated in a telephone socket.
20. The termination device according to claim 1 , wherein the device is configured to be integrated in a telephone set.
21. The termination device according to claim 1 , wherein the termination device is configured to be integrated in a telephone jack.
22. The termination device according to claim 1 , wherein the telephone device is configured to be integrated in a telephone extension wire.
23. The termination device according to claim 2 , wherein the cut-off frequency of the low-pass filter and a cut-off frequency of the high-pass filter are adjustable.
24. The termination device of claim 1 , wherein the cut-off frequency of the low pass filter is dimensioned depending on a high frequency band range used by the high speed modem for data transmission.
25. A termination device for a telephone line of a wire based telephone system, said termination device comprising:
a high-pass filter for separating signals within a frequency band used by a high-speed modem for data transmission;
an impedance connected to the high-pass filter, wherein said impedance includes an impedance value which matches the impedance of the telephone line in the frequency band used by the high-speed modem for data transmission; and
a low-pass filter having a variable cut-off frequency, wherein the impedance value of said impedance is asymptotically resistive, wherein the impedance includes a resistor, and wherein the impedance value of the resistor is 130 Ohms.
26. A termination device for a telephone line of a wire based telephone system, said termination device comprising:
a high-pass filter for separating signals within a frequency band used by a high-speed modem for data transmission;
an impedance connected to the high-pass filter, wherein said impedance includes an impedance value which matches the impedance of the telephone line in the frequency band used by the high-speed modem for data transmission; and
a low-pass filter having a variable cut-off frequency, wherein the low-pass filter is configured to separate a telephone voice signal transmitted within a low frequency band, and wherein the cut-off frequency of the low-pass filter is about 700 kHz.
27. A termination device for a telephone line of a wire based telephone system, said termination device comprising:
a high-pass filter for separating signals within a frequency band used by a high-speed modem for data transmission;
an impedance connected to the high-pass filter, wherein said impedance includes an impedance value which matches the impedance of the telephone line in the frequency band used by the high-speed modem for data transmission; and
a low-pass filter having a variable cut-off frequency, wherein the low-pass filter is configured to separate a telephone voice signal transmitted within a low frequency band, and wherein the frequency band includes an ISDN-frequency band ranging from 9 Hz to 130 kHz.
28. A termination device for a telephone line of a wire based telephone system, said termination device comprising:
a high-pass filter for separating signals within a frequency band used by a high-speed modem for data transmission;
an impedance connected to the high-pass filter, wherein said impedance includes an impedance value matches the impedance of the telephone line in the frequency band used by the high-speed modem for data transmission; and
a low-pass filter including an ISDN-frequency band ranging from approximately 9 Hz to approximately 130 kHz, wherein the termination device includes first and second line-side terminals for connecting to a telephone line, wherein the high-pass filter is connected across the first and second line-side terminals, and wherein the impedance is connected across the high-pass filter.
29. The termination device of claim 28 , wherein the cut-off frequency of the low-pass filter is dimensioned depending on a high frequency band range used by the high-speed modem for data transmission.
30. A termination device for a telephone line of a wire based telephone system, said termination device comprising:
a high-pass filter for separating signals within a first frequency band used by a high-speed modem for data transmission;
an impedance connected to the high-pass filter, wherein said impedance includes an impedance value which matches the impedance of the telephone line in the first frequency band used by the high-speed modem for data transmission; and
a low-pass filter for separating signals within a second frequency band, wherein a cut-off frequency of the low-pass filter and a cut-off frequency of the high-pass filter are adjustable, wherein the termination device includes first and second line-side terminals for connecting to a telephone line, wherein the high-pass filter is connected across the first and second line-side terminals, and wherein the impedance is connected across the high-pass filter.
31. The termination device of claim 30 wherein the cut-off frequency of the low-pass filter is dimensioned depending on a high frequency band range used by the high-speed modem for data transmission.
32. A termination device for a telephone line of a wire based telephone system, said termination device comprising:
a high-pass filter for separating signals within a frequency band used by a high-speed modem for data transmission;
an impedance connected to the high-pass filter, wherein said impedance includes an impedance value which matches the impedance of the telephone line in the frequency band used by the high-speed modem for data transmission; and
a low-pass filter having a variable cut-off frequency, wherein the termination device includes device-side terminals and line-side terminals, wherein the low-pass filter includes a plurality of inductors connected in series between the device-side terminals and the line-side terminals and inductors and capacitors connected across the device-side terminals and the line-side terminals, and wherein the high-pass filter includes a plurality of capacitors and an inductor connected across the device-side terminals and the line-side terminals.
33. A termination device for a telephone line of a wire based telephone system, said termination device comprising:
a high-pass filter for separating signals within a frequency band used by a high-speed modem for data transmission;
an impedance connected to the high-pass filter, wherein said impedance includes an impedance value matches the impedance of the telephone line in the frequency band used by the high-speed modem for data transmission; and
a low-pass filter including an ISDN-frequency band ranging from approximately 9 Hz to approximately 130 kHz, wherein the termination device includes device-side terminals and line-side terminals, wherein the low-pass filter includes a plurality of inductors connected in series between the device-side terminals and the line-side terminals and inductors and capacitors connected across the device-side terminals and the line-side terminals, and wherein the high-pass filter includes a plurality of capacitors and an inductor connected across the device-side terminals and the line-side terminals.
34. A termination device for a telephone line of a wire based telephone system, said termination device comprising:
a high-pass filter for separating signals within a first frequency band used by a high-speed modem for data transmission;
an impedance connected to the high-pass filter, wherein said impedance includes an impedance value which matches the impedance of the telephone line in the first frequency band used by the high-speed modem for data transmission; and
a low-pass filter for separating signals within a second frequency band, wherein a cut-off frequency of the low-pass filter and a cut-off frequency of the high-pass filter are adjustable, wherein the termination device includes device-side terminals and line-side terminals, wherein the low-pass filter includes a plurality of inductors connected in series between the device-side terminals and the line-side terminals and inductors and capacitors connected across the device-side terminals and the line-side terminals, and wherein the high-pass filter includes a plurality of capacitors and an inductor connected across the device-side terminals and the line-side terminals.