Apparatus system and method for enabling multi-frequency communication over a telephone network having a billing/tax tone

• US 6,674,843 B1
• Filed: 05/28/1999
• Issued: 01/06/2004
• Est. Priority Date: 05/28/1999
• Status: Expired due to Fees

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Ham, Ronald E.
• Primary Examiner(s): Isen, Forester W.
• Assistant Examiner(s): Swerdlow, Daniel
• Application Number:
  US09/322,330
• Time in Patent Office: 1,684 Days
• Field of Search: 379/93.01, 370/493, 370/494, 370/495
• US Class Current: 379/93.01
• CPC Class Codes: H04L 12/14 Charging , metering or billing arrangements for data wireline or wireless communications
• CPC Class Codes: H04M 11/062 using different frequency bands for speech and other data

Abstract

An apparatus, system, and method for enabling multi-frequency communication over a telephone network having a billing/tax tone are disclosed. The apparatus comprises a connection port operable to couple to a telephone network. An output port is coupled to the input port, and is operable to couple to a high frequency device. A trap is coupled between the connection port and the output port. The trap is tuned to isolate the high frequency device from the telephone network at a specified frequency range.

Claims

1. An apparatus for enabling multi-frequency communication, comprising:

a connection port operable to couple to a telephone network;

an output port coupled to the connection port, the output port operable to couple to a high frequency device; and

a trap coupled between the connection port and the output port, the trap tuned to isolate the high frequency device from the telephone network at a specified frequency range, and wherein the trap is operable to isolate the high frequency device from the telephone network such that attenuation of an input signal in the specified frequency range is less than 3 dB.

2. The apparatus of claim 1, wherein the specified frequency range comprises a range within approximately 3.5 kHz to approximately 25 kHz.

3. The apparatus of claim 1, wherein the high frequency device comprises an ADSL transceiver.

4. The apparatus of claim 1, wherein the trap comprises a high-Q series trap tuned to present a high impedance at the specified frequency range.

5. The apparatus of claim 1, wherein the specified frequency range comprises a frequency at which a billing/tax tone is communicated over the telephone network.

6. The apparatus of claim 1, wherein the specified frequency range is approximately 12 kHz +/−

1%.

7. The apparatus of claim 1, wherein the specified frequency range is approximately 16 kHz +/−

1%.

8. The apparatus of claim 1, wherein the connection port comprises a female RJ-11 jack.

9. The apparatus of claim 1, wherein the connection port is operable to couple to twisted pair wiring.

10. The apparatus of claim 9, wherein the trap comprises:

a first inductive element coupled to the connection port;

a first capacitive element coupled to the connection port in parallel with the first inductive element;

a second inductive element coupled to the connection port; and

a second capacitive element coupled to the connection port in parallel with the second inductive element;

such that when the connector port is coupled to the twisted pair wiring, the first inductive element and the first capacitive element are coupled to a first wire of the twisted pair wiring, and the second inductive element and the second capacitive element are coupled to a second wire of the twisted pair wiring.

11. The apparatus of claim 10, wherein the first and second capacitive elements comprise capacitors of approximately 390 nF.

12. The apparatus of claim 10, wherein the first and second inductive elements comprise inductors of approximately 450 microHenries.

13. The apparatus of claim 1, wherein there is one specified frequency range.

14. The apparatus of claim 1, further comprising:

a filter output port operable to couple to a low frequency device; and

a filter coupled between the connection port and the filter output port, the filter tuned to isolate the low frequency device from the premises network above the specified frequency range.

15. The apparatus of claim 14, wherein the filter output port is operable to couple to a telephone.

16. The apparatus of claim 14, wherein the connection port, the trap, the output port, and the filter output port are integrated into a single package.

17. The apparatus of claim 14, wherein the filter comprises a low pass filter.

18. The apparatus of claim 14, wherein the filter comprises a filter with a first pass band and a second pass band, the first pass band below the specified frequency range, and the second pass band approximately equal to the specified frequency range.

19. The apparatus of claim 18, wherein the first pass band is below approximately 3.5 kHz, and the second pass band is approximately 12 kHz +/−

1%.

20. The apparatus of claim 18, wherein the first pass band is below approximately 3.5 kHz, and the second pass band is approximately 16 kHz +/−

1%.

21. The apparatus of claim 1, further comprising:

a filter input port operable to couple to the telephone network;

a filter output port operable to couple to a low frequency device; and

a filter coupled between the connection port and the filter output port, the filter tuned to isolate the low frequency device from the telephone network above the specified frequency range.

22. The apparatus of claim 21, wherein the connection port, the trap, and the output port are integrated into a first package, and further wherein the filter input port, the filter output port, and the filter are integrated into a second package.

23. The apparatus of claim 1, wherein the connection port, the trap, and the output port and the high frequency device are integrated into a single package.