ISDN plus voice multiplexer system

• US 6,282,204 B1
• Filed: 12/19/1997
• Issued: 08/28/2001
• Est. Priority Date: 12/19/1997
• Status: Expired due to Fees

• Current Assignee: Terayon Communications Systems Incorporated (Motorola Solutions, Inc.)
• Original Assignee: Terayon Communications Systems Incorporated (Motorola Solutions, Inc.)
• Inventors: Akers, Francis I., Balatoni, Nicholas A.
• Primary Examiner(s): Nguyen, Chau
• Assistant Examiner(s): Nguyen, Phuongchau Ba
• Application Number:
  US08/995,244
• Time in Patent Office: 1,348 Days
• Field of Search: 375/260, 370/419, 370/420, 370/421, 370/465, 370/463, 370/466, 370/538, 370/914, 370/522, 370/524, 370/219, 370/228
• US Class Current: 370/421
• CPC Class Codes: H04Q 11/0442 Exchange access circuits
• CPC Class Codes: H04Q 2213/13034 A/D conversion, code compression/expansion
• CPC Class Codes: H04Q 2213/13039 Asymmetrical two-way transmission, e.g. ADSL, HDSL
• CPC Class Codes: H04Q 2213/13106 Microprocessor, CPU
• CPC Class Codes: H04Q 2213/13174 Data transmission, file transfer
• CPC Class Codes: H04Q 2213/13176 Common channel signaling, CCS7
• CPC Class Codes: H04Q 2213/13202 Network termination [NT]
• CPC Class Codes: H04Q 2213/13209 ISDN
• CPC Class Codes: H04Q 2213/13214 Clock signals
• CPC Class Codes: H04Q 2213/13215 Code checking, CRC
• CPC Class Codes: H04Q 2213/13216 Code signals, frame structure
• CPC Class Codes: H04Q 2213/13292 Time division multiplexing, TDM
• CPC Class Codes: H04Q 2213/13305 Transistors, semiconductors in general
• CPC Class Codes: H04Q 2213/1332 Logic circuits
• CPC Class Codes: H04Q 2213/13322 Integrated circuits
• CPC Class Codes: H04Q 2213/1336 Synchronisation

Abstract

A method and related apparatus for concurrent transmission and reception of at least one analog voice telephone signal and at least one ISDN service signal between a first location and a second location over a single twisted pair using a digitally encoded signal that is selected from the group consisting of 2B1Q and 4B3T signals. The method further includes the steps of sending line power over the single twisted pair, transferring the digitally encoded signal to the second location over the single twisted pair, and detecting non-operation of the digitally encoded signal between the first location and the second location to thereby impose a bypass lifeline and provide the analog telephone signal at the second location over the single twisted pair. The method also includes the step of providing the ISDN signal and the analog telephone signal at the second location over the single twisted pair when the non-operation is not detected. The present method and apparatus can provide at least a 2-to-1 pair gain by multiplexing signals representing the analog voice telephone signal and ISDN service signal, in a specific embodiment.

Claims

1. A method of concurrently transmitting and receiving signals representing at least one voice channel and at least ISDN (2B+D) service over a single twisted pair between a first location and a second location, said method comprising steps of:

providing at least one analog telephone signal and at least one ISDN signal at a first location;

converting said analog telephone signal into a first binary signal;

combining said first binary signal and said ISDN signal to a higher rate multiplexed binary signal;

converting said higher rate multiplexed binary signal into a digitally encoded signal, said digitally encoded signal being selected from the group consisting of 2B1Q and 4B3T signals;

sending line power over said single twisted pair;

transferring said digitally encoded signal to said second location over said single twisted pair;

detecting failure of said transferring of said digitally encoded signal between said first location and said second location to thereby impose a bypass lifeline and provide said analog telephone signal at said second location over said single twisted pair; and

providing said ISDN signal and said analog telephone signal at said second location over said single twisted pair when said failure of said transferring of said is not detected.

2. The method of claim 1 wherein said higher rate multiplexed binary signal is about 218 kbps.

3. The of claim 1 wherein said digitally encoded signal is about 109 kbps.

4. The method of claim 1 wherein said single twisted pair is at least 17 kilo-feet.

5. The method of claim 1 further comprising steps of:

at said second location;

receiving said digitally encoded signal from said single twisted pair;

converting said digitally encoded signal to said higher rate binary signal;

separating said first binary signal and said ISDN signal from said higher rate multiplexed binary signal; and

converting said first binary signal into said analog telephone signal and said ISDN signal for use at said second location.

6. The method of claim 5 wherein said steps at said second location occur in a detachable remote terminal unit.

7. The method of claim 1 wherein said first location is a telephone company location and said second location is a location between said telephone company location and a subscriber location.

8. The method of claim 1 wherein said second location is a telephone company location and said first location is a location between said telephone company location and a subscriber location.

9. The method of claim 1 wherein said first location is a telephone company location and said second location is a subscriber location.

10. The method of claim 7 wherein said second location is near a subscriber location, said subscriber location comprising a home or office.

11. The method of claim 1 wherein said second location is a telephone company location and said first location is a subscriber location.

12. The method of claim 8 wherein said first location is near a subscriber location, said subscriber location comprising a home or office.

13. Apparatus for concurrent transmission and reception of signals from at least one voice channel and at least one ISDN (2B+D) service between a first location and a second location over a single twisted pair, said apparatus comprising:

at least one analog telephone signal source and at least one ISDN signal source at a first location;

a multiplexing unit at said first location, said multiplexing unit converting said analog telephone signal into a first binary signal, combining said first binary signal with said ISDN signal into a higher rate multiplexed binary signal, converting said higher rate multiplexed binary signal into a digitally encoded signal, said digitally encoded signal providing concurrent transmission and reception between said first and said second locations over said single twisted pair, said digitally encoded signal selected from the group consisting of 2B1Q and 4B3T signals; and

wherein said multiplexing unit includes a bypass circuit for providing said analog telephone signal to said second location over said single-twisted pair if transmission of said digitally encoded signal is detected to have failed on said single twisted pair.

14. The apparatus of claim 13 wherein said digitally encoded signal is about 109 kbps.

15. The apparatus of claim 14 wherein said higher rate multiplexed binary signal is about 218 kbps.

16. The apparatus of claim 15 wherein said single twisted pair line is a 17 kilo-feet.

17. The apparatus of claim 13 wherein said first location is a telephone company location and said second location is a location between said telephone company location and a subscriber location, and said multiplexing unit comprises a detachable line unit.

18. The apparatus of claim 13 wherein said second location is a telephone company location and said first location is a location between said telephone company location and a subscriber location, and said multiplexing unit comprises a remote terminal unit.

19. The apparatus of claim 13 wherein said first location is a telephone company location and said second location is a location comprises a subscriber location, and said multiplexing unit comprises a detachable line unit.

20. The apparatus of claim 13 wherein said second location is a telephone company location and said first location comprises a subscriber location, and said multiplexing unit comprises a remote terminal unit.