Apparatus and method for transmission of voice band signals over a DSL line

• US 6,704,324 B1
• Filed: 03/25/1999
• Issued: 03/09/2004
• Est. Priority Date: 03/25/1998
• Status: Expired due to Fees

• Current Assignee: IPR 3 Pty Limited
• Original Assignee: Paradyne Corporation (Dasan Networks Incorporated)
• Inventors: Holmquist, Kurt
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): Boakye, Alexander O.
• Application Number:
  US09/276,013
• Time in Patent Office: 1,811 Days
• Field of Search: 370/354, 370/465, 370/494, 370/352, 370/353, 370/355, 370/356, 370/493, 370/495, 370/359, 370/395.52, 370/463, 370/467, 370/496, 370/540, 370/533, 379/9.06, 379/27, 379/12, 379/24, 375/222, 375/224, 375/225, 375/228
• US Class Current: 370/465
• CPC Class Codes: H04Q 11/02 for frequency-division multiplexing H04Q11/0001 takes precedence
• CPC Class Codes: H04Q 11/04 for time-division multiplexing H04Q11/0001 takes precedence
• CPC Class Codes: H04Q 2213/13039 Asymmetrical two-way transmission, e.g. ADSL, HDSL
• CPC Class Codes: H04Q 2213/1309 Apparatus individually associated with a subscriber line, line circuits
• CPC Class Codes: H04Q 2213/13096 Digital apparatus individually associated with a subscriber line, digital line circuits
• CPC Class Codes: H04Q 2213/13291 Frequency division multiplexing, FDM
• CPC Class Codes: H04Q 2213/13292 Time division multiplexing, TDM

Abstract

Apparatus and method for providing simultaneously multiple telephone-type services to any/all POTS-type devices on a single wire pair at a user premises. The present invention provides for the ability to add separately addressable POTS devices on a single service loop.

Claims

1. A data communications apparatus for supporting at least one plain old telephone service (POTS) communications device simultaneously, said data communications apparatus comprising:

interface circuitry connectable to a communications link;

a derived POTS interface circuitry connectable to said at least one POTS communications device;

a digital-interface circuitry connectable to a digital device; and

a logic circuitry that allows said data communications apparatus to alternately transmit a signal from said at least one POTS communications device and a signal from said digital device,

wherein said logic circuitry further comprises;

a converter circuitry for converting each analog signal from said at least one POTS communications device into derived digital signal samples;

at least one buffer memory, wherein said at least one buffer memory receives and stores said derived digital signal samples so that a block of derived digital signal samples for said at least one POTS communications device source signal is available to be sent over said communications link as a burst;

a selector circuitry that selects from one of said at least one buffer memory a block of said derived digital signal samples for formatting;

a multi-dimensional formatting circuitry that receives said block of said derived digital signal samples from said at least one buffer memory and combines at least two of said signal samples into a single multi-dimensional symbol; and

a multiplexer that alternately selects blocks of symbols for transmission over said communications link, said multiplexer alternately selecting blocks of symbols from said at least one POTS communications device and said digital device.

2. The apparatus of claim 1, wherein said converter circuitry further comprises:

circuitry to convert each said analog signal to a derived digital signal by sampling the analog signal at a sample rate of 8 kHz to a produce a stream of derived digital signal samples; and

wherein said conversion is selected from the group consisting of a linear conversion, Mu conversions or A law conversions.

3. The apparatus of claim 1, wherein said at least one buffer memory further comprises:

circuitry that groups said derived digital signal samples into frames until pairs of derived digital signal samples can be applied to the modulating signal in a burst.

4. The apparatus of claim 1, wherein said selector circuitry further comprises:

circuitry that selects derived digital signal samples from one of said at least one buffer memory in a circular manner.

5. The apparatus of claim 1, wherein said multi-dimensional formatting circuitry further comprises:

circuitry that receives said derived digital signal samples two at a time from said at least one buffer memory and combines at least two of said signal samples into a single two-dimensional symbol with in-phase and quadrature components.

6. The apparatus of claim 1, wherein said multiplexer further comprises:

circuitry for controlling said multiplexer depending on the technique used for managing bandwidth on said communications link.

7. The apparatus of claim 1, further comprises:

translation circuitry for reducing a perceived amount of noise.

8. A method for use in data communications apparatus for supporting at least one plain old telephone service (POTS) communications device simultaneously, the method comprising the steps of:

providing a derived POTS interface circuitry connectable to said at least one POTS communications device;

providing a digital interface circuitry connectable to a digital device;

receiving at least one analog signal from said at least one POTS communications device connected to said data communications apparatus;

converting each analog signal from said at least one POTS communications device into derived digital signal samples;

receiving a block of said derived digital signal samples and combining at least two of said signal samples into a single multi-dimensional symbol; and

selecting alternate blocks of symbols for transmission over a communications link, and alternating transmission of said blocks of symbols from said at least one POTS communications device and said digital device.

9. The method of claim 8, comprising the steps of:

storing said derived digital signal samples so that a block of derived digital signal samples for said at least one POTS communications device source signal is available as a burst; and

selecting a block of said derived digital signal samples for formatting from one of said at least one buffer memory.

10. The method of claim 9, wherein the step of receiving said block of said derived digital signal samples and combining at least two of said signal samples includes the steps of:

receiving said derived digital signal samples two at a time from said at least one buffer memory; and

combining at least two of said signal samples into a single two-dimensional symbol with in-phase and quadrature components.

11. The method of claim 9, wherein the step of selecting alternate blocks of symbols for transmission includes the step of:

controlling said selecting depending on the technique used for managing bandwidth on said communications link.

12. The method of claim 9, further includes the step of:

reducing a perceived amount of noise.

13. The method of claim 8, wherein the step of converting each analog signal includes the steps of:

selecting a converting method from the group consisting of a linear conversion, Mu conversions or A law conversions; and

converting each said analog signal to a derived digital signal by sampling the analog signal at a sample rate of 8 kHz to a produce a stream of derived digital signal samples.

14. The method of claim 8, wherein the step of storing said derived digital signal samples includes the steps of:

grouping said derived digital signal samples into frames until pairs of derived digital signal samples can be applied to the modulating signal in a burst.

15. The method of claim 8, wherein the step of selecting a block of said derived digital signal samples for formatting includes the steps of:

selecting derived digital signal samples from one of said at least one buffer memory in a circular manner.

16. Data communications apparatus comprising:

a means for providing a connection to at least one plain old telephone service (POTS) communications device;

a means for providing a connection to a digital device;

a means for receiving at least one analog signal from said at least one POTS communications device connected to said data communications apparatus;

a means for converting each analog signal from said at least one POTS communications device into derived digital signal samples;

a means for receiving a block of said derived digital signal samples and combining at least two of said signal samples into a single multi-dimensional symbol; and

a means for selecting alternate blocks of symbols for transmission over a communications link, said selecting means alternating transmission of said blocks of symbols from said at least one of a plurality of analog devices and said digital device.

17. The apparatus of claim 16 further comprising:

a means for storing said derived digital signal samples so that a block of the derived digital signal samples for said at least one POTS communications device source signal is available as a burst; and

a means for selecting a block of said derived digital signal samples for formatting from said storing means.

18. The apparatus of claim 16, wherein said converting each analog signal means further comprises:

a means for selecting a converting method from the group consisting of a linear conversion, Mu conversions or A law conversions; and

a means for converting each said analog signals to a derived digital signal by sampling the analog signal at a sample rate of 8 kHz to a produce a stream of derived digital signal samples.

19. The apparatus of claim 16, wherein said storing said derived digital signal samples means further comprises:

a means for grouping said derived digital signal samples into frames until pairs of derived digital signal samples can be applied to the modulating signal in a burst.

20. The apparatus of claim 16, wherein said selecting a block of said derived digital signal samples for formatting means further comprises:

a means for selecting derived digital signal samples from said storing said derived digital signal samples means in a circular manner.

21. The apparatus of claim 16, wherein said receiving said block of said derived digital signal samples and combining at least two of said signal samples means further comprises:

a means for receiving said derived digital signal samples two at a time from said at least one buffer memory; and

a means for combining at least two of said signal samples into a single two-dimensional symbol with in-phase and quadrature components.

22. The apparatus of claim 16, wherein said selecting alternate blocks of symbols for transmission means further comprises:

a means for controlling said selecting depending on the technique used for managing bandwidth on said communications link.

23. The apparatus of claim 16, further comprising:

a means for reducing a perceived amount of noise.

24. A method for use in data communications apparatus for supporting at least one plain old telephone service (POTS) device simultaneously, the method comprising the steps of:

receiving at least one analog signal from said at least one POTS device connected to said data communications apparatus;

converting each at least one analog signal into a plurality of derived digital signal samples;

receiving a block of said plurality of derived digital signal samples from each at least one POTS device and combining at least two of said plurality of derived data digital samples in said block into a multi-dimensional symbol;

selecting a first block of said multi-dimensional symbols from said at least one POTS device;

receiving a stream of data from a Data Terminal Equipment (DTE) and mapping said stream of data into a plurality of symbols;

selecting a second block of symbols from said plurality of symbols; and

transmitting alternately said first block of symbols and said second block of symbols over a communications link.

25. The method of claim 24, further comprising the steps of:

storing said derived digital signal samples so that a block of derived digital signal samples for said at least one POTS communications device source signal is available as a burst; and

selecting a block of said derived digital signal samples for formatting from one of said at least one buffer memory.

26. The method of claim 24, wherein the step of converting each analog signal further comprises:

selecting a converting method from the group consisting of a linear conversion, Mu conversions or A law conversions; and

converting each said analog signal to a derived digital signal by sampling the analog signal at a sample rate of 8 kHz to a produce a stream of derived digital signal samples.

27. The method of claim 24, wherein the step of storing said derived digital signal samples further comprises:

grouping said derived digital signal samples into frames until pairs of derived digital signal samples can be applied to a modulating signal in a burst.

28. The method of claim 24, wherein the step of selecting a block of said derived digital signal samples for formatting further comprises:

selecting said derived digital signal samples from one of said at least one buffer memory in a circular manner.

29. The method of claim 24, wherein the step of receiving said block of said derived digital signal samples and combining at least two of said signal samples further comprises:

receiving said derived digital signal samples two at a time from said at least one buffer memory; and

combining at least two of said signal samples into a single two-dimensional symbol with in-phase and quadrature components.

30. The method of claim 24, wherein the step of selecting alternate blocks of symbols for transmission further comprises:

controlling said selecting depending on the technique used for managing bandwidth on said communications link.