Unbundling device and method for connecting a competing local exchange carrier (CLEC) to the subscriber loop of a local exchange carrier (LEC)

• US 6,282,277 B1
• Filed: 11/28/1997
• Issued: 08/28/2001
• Est. Priority Date: 11/28/1997
• Status: Expired due to Fees

• Current Assignee: CommScope Inc. (CommScope Holding Company, Inc.)
• Original Assignee: Avaya Technology Corporation Miami Lakes FLA US
• Inventors: DeBalko, George Andrew
• Primary Examiner(s): Tsang, Fan
• Assistant Examiner(s): Foster, Roland G.
• Application Number:
  US08/980,237
• Time in Patent Office: 1,369 Days
• Field of Search: 379/201, 379/219, 379/220, 379/221, 379/224, 379/225, 379/229, 379/258, 379/333, 379/334, 379/335, 379/120, 379/243, 379/156
• US Class Current: 379/221.02
• CPC Class Codes: H04M 3/30 for subscriber's lines , for the local loop
• CPC Class Codes: H04M 3/301 Circuit arrangements at the subscriber's side of the line
• CPC Class Codes: H04M 3/4228 in networks
• CPC Class Codes: H04M 3/42289 with carrierprovider selection by subscriber

Abstract

An unbundling demarcation device (UDD) is disclosed for disconnecting the equipment of a local exchange carrier (LEC) from a subscriber in order to permit a competing local exchange carrier (CLEC) to provide local service to the subscriber. The unbundling demarcation device (UDD) and related CLEC equipment may be positioned at any point in the subscriber loop, between the LEC switch and the subscriber equipment. The unbundling demarcation device (UDD) is an electro-mechanical or electro-optical coupling device, such as a sensitive relay, a latching relay, a switching mechanism or a solid state device that simulates a relay. The unbundling demarcation device (UDD) connects the LEC equipment to the CLEC equipment when a voltage or other trigger signal is applied to the subscriber loop by the LEC. When the voltage is removed from the subscriber loop, or when a deactivating signal is sent, the unbundling demarcation device (UDD) will open circuit or decouple, preventing the LEC from accessing the subscriber equipment and allowing the CLEC to access the subscriber. The unbundling demarcation device (UDD) can be utilized to determine whether there is a fault in the subscriber loop up to and beyond the unbundling demarcation device (UDD). With no voltage applied, the unbundling demarcation device (UDD) disconnects the CLEC equipment, and the LEC can evaluate the subscriber loop all the way to the unbundling demarcation device (UDD). With the voltage applied, the LEC can evaluate the CLEC loop and customer equipment for faults as well. Unlike electronic MTUs, the unbundling demarcation device (UDD) does not present a lossy device when deactivated.

Claims

1. A method of connecting a competing local exchange carrier (CLEC) to a subscriber loop between a local exchange carrier (LEC) and a subscriber, said method comprising the steps of:

selectively applying a control signal from said LEC on said subscriber loop; and

connecting said CLEC to said subscriber loop by means of a coupling device, said coupling device positioned remotely from said subscriber such that said subscriber may be selectively connected to said LEC or said CLEC using a single subscriber loop between said subscriber and said coupling device, said coupling device operative to selectively disconnect said LEC when said subscriber elects to utilize said CLEC, said control signal applied to said loop by said LEC until a deactivating control signal is applied to said loop by said LEC.

2. The method according to claim 1, further comprising the step of ensuring said control signal may be applied under either polarity.

3. The method according to claim 1, wherein said subscriber loop is part of a POTS or PBX system, and said control signal is approximately 48 volts.

4. The method according to claim 1, wherein said subscriber loop is part of an ISDN system, and said control signal is a trigger signal.

5. The method according to claim 1, further comprising the step of limiting resistor current through said coupling device to prevent the occurrence of a ring trip condition.

6. The method according to claim 1, wherein said coupling device and said competing local exchange carrier are connected to said subscriber loop at the premises of said subscriber.

7. The method according to claim 1, wherein said coupling device and said competing local exchange carrier are connected to said subscriber loop at the premises of said local exchange carrier.

8. An unbundling device for connecting a subscriber loop of a competing local exchange carrier (CLEC) to a subscriber loop of a local exchange carrier (LEC), each of said subscriber loops comprised of a twisted pair, said unbundling device comprising:

at least four connection points for interconnecting with said twisted pairs; and

a coupling device connected between said connection points, said coupling device positioned remotely from said subscriber such that said subscriber may be selectively connected to said LEC or said CLEC using a single subscriber loop between said subscriber and said coupling device, said coupling device having a pair of contacts that close when said coupling device is activated by said LEC, said coupling device operative to selectively disconnect said LEC when said subscriber elects to utilize said CLEC, said control signal applied to said loop by said LEC until a deactivating control signal is applied to said loop by said LEC.

9. The unbundling device according to claim 8, further comprising a polarity bridge to ensure said unbundling device operates under either polarity of said control signal.

10. The unbundling device according to claim 8, wherein said subscriber loop is part of a POTS or PBX system, and said coupling device is activated by applying a voltage of approximately 48 volts.

11. The unbundling device according to claim 8, wherein said subscriber loop is part of an ISDN system, and said coupling device is activated by a trigger signal.

12. The unbundling device according to claim 8, further comprising a current limiting resistor to prevent the occurrence of a ring trip condition.

13. The unbundling device according to claim 8, further comprising line feed resistors for said twisted pair of said competing local exchange carrier to allow said unbundling device to operate in the presence of faults in equipment of said competing local exchange carrier or said subscriber.

14. The unbundling device according to claim 8, further comprising line feed resistors for said twisted pair of said competing local exchange carrier to reduce fault current in the presence of an electrical surge.

15. The unbundling device according to claim 8, wherein said coupling device and said competing local exchange carrier are connected to said subscriber loop at the premises of said subscriber.

16. The unbundling device according to claim 8, wherein said coupling device and said competing local exchange carrier are connected to said subscriber loop at the premises of said local exchange carrier.

17. The unbundling device according to claim 8, wherein said coupling device is activated by application of an appropriate voltage signal.

18. The unbundling device according to claim 8, wherein said coupling device is activated by application of an appropriate light signal.

19. The unbundling device according to claim 8, wherein said coupling device is activated by application of a trigger voltage.

20. A method of connecting a competing local exchange carrier (CLEC) to a subscriber loop between a local exchange carrier (LEC) and a subscriber, said method comprising the steps of:

selectively applying a relay control signal from said LEC on said subscriber loop; and

connecting said CLEC to said subscriber loop when said subscriber elects to utilize said CLEC by means of a relay, said relay positioned remotely from said subscriber such that said subscriber may be selectively connected to said LEC or said CLEC using a single subscriber loop between said subscriber and said relay, said relay operative to selectively disconnect said LEC when said relay control signal is applied to said loop by said LEC until a deactivating control signal is applied to said loop by said LEC.

21. The method according to claim 20, further comprising the step of ensuring said control signal may be applied under either polarity.

22. The method according to claim 20, wherein said subscriber loop is part of a POTS or PBX system, and said relay control signal is approximately 48 volts.

23. The method according to claim 20, wherein said subscriber loop is part of an ISDN system, and said relay control signal is a trigger signal.

24. The method according to claim 20, further comprising the step of limiting resistor current through said relay to prevent the occurrence of a ring trip condition.

25. The method according to claim 20, wherein said relay and said competing local exchange carrier arc connected to said subscriber loop at the premises of said subscriber.

26. The method according to claim 20, wherein said relay and said competing local exchange carrier are connected to said subscriber loop at the premises of said local exchange carrier.