Dual DDS data multiplexer

• US 5,668,814 A
• Filed: 03/20/1995
• Issued: 09/16/1997
• Est. Priority Date: 03/20/1995
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Raychem Limited (TE Connectivity Limited)
• Inventors: Balatoni, Nicholas A.
• Primary Examiner(s): Safourek, Benedict V.
• Application Number:
  US08/408,585
• Time in Patent Office: 911 Days
• Field of Search: 375/211, 375/214, 375/240, 375/241, 375/286, 375/288, 375/289, 370/37, 370/41, 370/43, 370/112, 370/118, 370/203, 370/297, 370/298, 370/300, 370/540, 379/90, 379/93, 379/94, 379/97, 379/108
• US Class Current: 370/540
• CPC Class Codes: H04L 5/04 the signals being represented by different amplitudes or polarities, e.g. quadriplex
• CPC Class Codes: H04Q 11/04 for time-division multiplexing H04Q11/0001 takes precedence
• CPC Class Codes: H04Q 2213/13034 A/D conversion, code compression/expansion
• CPC Class Codes: H04Q 2213/13106 Microprocessor, CPU
• CPC Class Codes: H04Q 2213/13194 Four wire connection, transmission
• CPC Class Codes: H04Q 2213/13202 Network termination [NT]
• CPC Class Codes: H04Q 2213/13216 Code signals, frame structure
• CPC Class Codes: H04Q 2213/13292 Time division multiplexing, TDM
• CPC Class Codes: H04Q 2213/13381 Pair-gain system, digital loop carriers

Abstract

A method and apparatus 200 for converting dual 4-wire digital data services (DDS-1 and DDS-2) for transmission over a single twisted pair telephone line 205. The present method includes use of a digital data service remote terminal 219 and a digital data service central office terminal 201. Each terminal converts more than one 4-wire digital data services into a 2B1Q signal for transmission over the single twisted pair telephone line 205. The present method provides an efficient and cost effective technique for increasing 4-wire digital data services to a customer premises without a corresponding increase in the number of telephone lines.

Claims

1. A method of transferring digital data over a single twisted pair from a first location, said method comprising steps of:

providing a plurality of 4-wire DDS signals from a channel bank at the first location, each of said first plurality of 4-wire DDS signals being a bipolar signal;

combining said plurality of 4-wire DDS signals into a binary signal, and converting said binary signal into a digital signal, said digital signal being selected from a group consisting of a 2B1Q format and a 4B3T format;

transferring said digital signal over said single twisted pair telephone line for use at a second location.

2. The method of claim 1 wherein each of said 4-wire DDS signals includes a signalling rate selected from a group consisting of 2.4 kbps, 4.8 kbps, 9.6 kbps, 19.2 kbps, 56 kbps, and 64 kbps.

3. The method of claim 1 wherein said plurality of 4-wire DDS signals are two 4-wire DDS signals.

4. The method of claim 1 wherein said binary signal is a 256 kbps signal and said digital signal is a 160 kbps signal.

5. The method of claim 1 wherein said plurality of 4-wire DDS signals is from a D4 channel bank.

6. The method of claim 1 wherein said plurality of 4-wire DDS signals is from a SLC-96 channel bank.

7. The method of claim 1 wherein at least one of said plurality of 4-wire DDS signals is selected from a group comprising a video signal, a data signal, and a voice signal.

8. The method of claim 1 wherein said method occurs in a detachable COT unit.

9. The method of claim 1 wherein said single twisted pair is an 18 kilo-feet span using mixed gauge cable.

10. The method of claim 1 further comprising a method of receiving said digital signal from said first location, said receiving method comprising steps:

providing said digital signal over said single twisted pair from telephone company equipment;

converting said digital signal into a binary signal, and separating said binary signal into said plurality of 4-wire DDS signals; and

providing at least one of said plurality of 4-wire DDS signals to a data terminal equipment.

11. The method of claim 10 wherein the first location comprises a telephone company location and the second location comprises a customer premises.

12. The method of claim 1 wherein said first location comprises a telephone company location.

13. The method of claim 1 wherein said second location comprises a customer premises.

14. An apparatus for transferring digital data over a single twisted pair from a first location, said apparatus comprising:

a plurality of 4-wire DDS signals sources from a channel bank at the first location, each of said plurality of 4-wire DDS signals being a bipolar signal; and

a central office circuit combining said plurality of 4-wire DDS signals into a binary signal, converting said binary signal into a digital signal; and

for transferring said digital signal over a single twisted pair telephone line for use at said second location, said digital signal being selected from a group consisting of a 2B1Q format and a 4B3T format.

15. The apparatus of claim 14 further comprising:

a plurality of 4-wire DDS signals sources from a plurality of data terminal equipment, each of said plurality of 4-wire DDS signals being a bipolar signal; and

a remote terminal circuit combining said plurality of 4-wire DDS signals into a binary signal, converting said binary signal into a digital signal, and transferring said digital signal over a single twisted pair telephone line for use at a telephone company equipment, said digital signal being selected from a group consisting of a 2B1Q format and a 4B3T format.

16. The apparatus of claim 14 wherein each of said 4-wire DDS signals includes a signalling rate selected from a group consisting of 2.4 kbps, 4.8 kbps, 9.6 kbps, 19.2 kbps, 56 kbps, and 64 kbps.

17. The apparatus of claim 14 wherein said plurality of 4-wire DDS signals are two 4-wire DDS signals.

18. The apparatus of claim 14 wherein said binary signal is a 256 kbps signal and said digital signal is a 160 kbps signal.

19. The apparatus of claim 14 wherein said plurality of 4-wire DDS signals is from a D4 channel bank.

20. The apparatus of claim 14 wherein said plurality of 4-wire DDS signals is from a SLC-96 channel bank.

21. The apparatus of claim 14 wherein at least one of said plurality of 4-wire DDS signals is selected from a group comprising of a video signal, a data signal, and a voice signal.

22. The apparatus of claim 14 wherein said central office circuit is included in a detachable COT unit.

23. The apparatus of claim 14 wherein said single twisted pair is an 18 kilo-feet span of mixed gauge cable.

24. The method of claim 14 wherein said first location comprises a telephone company location.

25. The method of claim 14 wherein said second location comprises a customer premises.

26. The method of claim 14 wherein said first location comprises a telephone company location and said second location comprises a customer premises.