Multiple ISDN and pots carrier system

• US 6,141,330 A
• Filed: 09/20/1996
• Issued: 10/31/2000
• Est. Priority Date: 09/20/1996
• Status: Expired due to Term

• Current Assignee: Benhov GmbH, LLC (Intellectual Ventures LLC)
• Original Assignee: GoDigital Networks Corp. (Communications Test Design Incorporated)
• Inventors: Akers, Francis I.
• Primary Examiner(s): Pham, Chi H.
• Assistant Examiner(s): YAO, KWANG BIN
• Application Number:
  US08/717,475
• Time in Patent Office: 1,502 Days
• Field of Search: 370/263, 370/264, 370/265, 370/270, 370/271, 370/391, 370/532, 370/536, 370/537, 370/538, 370/542, 370/543, 370/535, 379/2, 379/191, 379/199
• US Class Current: 370/264
• CPC Class Codes: H04L 12/2854 Wide area networks, e.g. public data networks
• CPC Class Codes: H04Q 11/0442 Exchange access circuits
• CPC Class Codes: H04Q 11/0471 Terminal access circuits
• CPC Class Codes: H04Q 2213/13003 Constructional details of switching devices
• CPC Class Codes: H04Q 2213/1308 Power supply
• CPC Class Codes: H04Q 2213/13082 Power supply via phantom line
• CPC Class Codes: H04Q 2213/13106 Microprocessor, CPU
• CPC Class Codes: H04Q 2213/13166 Fault prevention
• CPC Class Codes: H04Q 2213/13202 Network termination [NT]
• CPC Class Codes: H04Q 2213/13209 ISDN
• CPC Class Codes: H04Q 2213/13292 Time division multiplexing, TDM
• CPC Class Codes: H04Q 2213/1332 Logic circuits
• CPC Class Codes: H04Q 2213/13322 Integrated circuits

Abstract

High-speed digital transmission can be achieved with existing phone lines and HDSL chipsets while retaining plain old telephone service (POTS) with full failsafe capability. Two original ISDN signals [4,5] at a rate of 160 kbps and one POTS channel [10] digitized at 64 kbps are multiplexed by a MIPCS card [6] of a signal provider [1]. The resulting digital signal is transported over a twisted cable pair [2] which has an approximate maximum length of 16 kft based on the current technology. At a receiving end, the signal is demultiplexed and regenerated by a subscriber'"'"'s MIPCS card [7]. The subscriber'"'"'s MIPCS card is line-powered via the cable [2] to avoid dependence upon local power. The regenerated signals are transmitted over one POTS line [42] and two ISDN cables [8,9] to remote premises. Both MIPCS cards have bypass relays for the POTS lines to ensure the subscriber'"'"'s POTS access in the event of a local power outage or electronic failure.

Claims

1. A high bit communication system, comprising:

a) a single twisted cable pair with line-powering capability;

b) a signal provider configured to multiplex two ISDN signals and a POTS channel and to connect a public switched telephone network to a first end of the twisted cable pair having a transmission rate of at least 384 kbps, the signal provider including one MIPCS card which connects two ISDN cards and one POTS line card to the first end of said twisted cable pair, the MIPCS card including a transceiver, a frame processor, a digital interface module, a subscriber line interface module, a utility microprocessor, and a bypass relay; and

c) a signal subscriber configured to demultiplex and regenerate said two ISDN signals and said POTS channel received via said twisted cable pair at said transmission rate of at least 384 kbps and to connect a second end of the twisted cable paw to remote premises;

wherein said signal provider is configured to use a 2B1Q transport mechanism for transmitting signals at a minimum rate of 384 kbps.

2. The high bit communication system of claim 1 wherein the twisted cable pair is approximately 16 kft providing approximately 1.2 kΩ

maximum loop resistance, from the signal provider to the signal subscriber, back to the signal provider.

3. The high bit communication system of claim 1 wherein said POTS channel is by default mechanically available to said subscriber in the event of either a local power loss or electronic failure.

4. The system of claim 1 wherein the ISDN cards provide digital interfaces between a public switched telephone network and a local ISDN network with a transmission rate of 160 kbps.

5. The system of claim 1 wherein the MIPCS card is powered with a 48-Volt power supply.

6. The system of claim 1 wherein the digital interface module is connected to said frame processor, said utility microprocessor, and two ISDN cables extended from said ISDN cards interfaced to the public switched telephone network and uses two ISDN U-interfaces.

7. The system of claim 1 wherein the subscriber line interface module is connected to said from processor, said utility microprocessor, and one POTS line extended from said POTS card interfaced to the public switched telephone network.

8. The system of claim 1 wherein the utility microprocessor connects said frame processor to said digital data interface module and said subscriber line interface module.

9. The system of claim 1 wherein the utility microprocessor comprises a means for providing loopback testing in accordance with the National ISDN Standards.

10. The system of claim 1 wherein the bypass relay connects said twisted pair and the POTS line extended from said POTS card interfaced to the public switched telephone network.

11. The high bit communication system of claim 1 wherein the signal subscriber comprises one MIPCS card, two ISDN cables having a first end and a second end, and one POTS line having a first end and a second end.

12. The system of claim 11 wherein the MIPCS card connects the second end of the twisted cable pair to the first ends of the ISDN cables and POTS line.

13. The system of claim 11 wherein the MIPCS card is powered via the twisted cable pair, and the line voltage does not exceed 160 Volts in total or 80 Volts per wire in accordance with the US safety standards.

14. The system of claim 11 wherein the MIPCS card is powered via the twisted cable pair in accordance with the international safety standards, which vary and can go as low as 50 Volts on each wire.

15. The system of claim 11 wherein the MIPCS card comprises a transceiver, a frame processor, a digital interface module, a subscriber line interface module, a utility microprocessor, and a bypass relay.

16. The system of claim 15 wherein the digital interface module connects said frame processor, said utility microprocessor, and said first ends of said two ISDN cables, and uses two ISDN U-interfaces.

17. The system of claim 15 wherein the subscriber line interface module is connected to said frame processor, said utility microprocessor, and the first end of said POTS line.

18. The system of claim 15 wherein the subscriber line interface module supports a local loop of up to 530-Ohm resistance with five ringer equivalents.

19. The system of claim 15 wherein the utility microprocessor connects said frame processor to said digital data interface module and said subscriber line interface module.

20. The system of claim 15 wherein the utility microprocessor is adapted to provide for loopback testing in accordance with the National ISDN Standards.

21. The system of claim 15 wherein the bypass relay connects said twisted pair and the first end of said POTS line.

22. The system of claim 11 wherein said ISDN cables and said POTS line connect the MIPCS card to remote premises.

23. The system of claim 11 wherein the ISDN cables have a transmission rate of 160 kbps and a maximum length of 18 kft.

24. The system of claim 11 wherein the POTS line has a maximum length of 2 kft which corresponds to a loop resistance of 130 Ohms.

25. A high bit communication system, comprising:

a single twisted cable pair;

a signal provider configured to multiplex at least two ISDN signals and a POTS signal, each of said ISDN signals having a transmission rate of 160 kbps and said POTS signal having a transmission rate of 64 kbps, wherein said signal provider includes a first transceiver, a first frame processor, a digital interface module, a subscriber line interface module, a utility microprocessor, and a bypass relay, said first transceiver configured to couple said single twisted cable pair to said frame processor, and to transmit digital signals at a minimum rate of 384 kbps; and

a signal subscriber configured to receive said multiplexed signal from said signal provider via said twisted cable pair at said transmission rate of at least 384 kbps, said signal subscriber further configured to demultiplex said multiplexed signal and to re-generate said two ISDN signals and said POTS signal at said transmission rates of 160 kbps and 64 kbps, respectively;

wherein said signal provider is further configured to use a 2B1Q transport mechanism for transmitting signals at a minimum rate of 384 kbps.

27. The system of claim 25 wherein said signal subscriber includes a second transceiver and a second frame processor, said second transceiver configured to couple said single twisted cable pair and said frame processor, and to transmit digital signals at a minimum rate of 384 kpbs.

28. The system of claim 25 wherein the twisted cable pair is approximately 16 kft providing approximately 1.2 kΩ

maximum loop resistance, from the signal provider to the signal subscriber, back to the signal provider.

26. The system of 25 wherein said twisted cable pair transmission rate is 416 kbps.

29. A method of transmitting two ISDN signals and one POTS signal, said method comprising the steps of:

multiplexing at least two ISDN signals and a POTS signal, each of said ISDN signals having a transmission rate of 160 kbps and said POTS signal having a transmission rate of 64 kbps, and in accordance thereto, generating a multiplexed signal, said generating step including the step of providing a transceiver, a frame processor, a digital interface module, a subscriber line interface module, a utility microprocessor, and a bypass relay;

providing said multiplexed signal to a first end of said twisted cable pair at a twisted cable pair transmission rate of at least 384 kbps using a 2B1Q transport mechanism;

receiving said multiplexed signal from said signal provider via said twisted cable pair at said transmission rate of at least 384 kbps; and

demultiplexing said multiplexed signal to re-generate said two ISDN signals and said POTS signal at said transmission rates of 160 kbps and 64 kbps, respectively.

30. The method of claim 29 wherein said twisted cable pair transmission rate is 416 kbps.

31. The method of claim 29 where in the twisted cable pair provides approximately 1.2 kΩ

maximum loop resistance from the signal provider to the signal subscriber back to the signal provider.