System and method for a multi-host subscriber loop

• US 6,320,856 B1
• Filed: 03/08/1999
• Issued: 11/20/2001
• Est. Priority Date: 05/23/1996
• Status: Expired due to Term

• Current Assignee: Alcatel-Lucent USA, Inc. (Nokia Corporation)
• Original Assignee: Alcatel-Lucent USA, Inc. (Nokia Corporation)
• Inventors: Howe, Richard L., Deschaine, Stephen A., Traupman, Edward P., Mallinson, Stephen R.
• Primary Examiner(s): RAO, SEEMA SRINIVAS
• Application Number:
  US09/264,595
• Time in Patent Office: 988 Days
• Field of Search: 370/327-330, 370/336-338, 370/340-345, 370/347, 370/348, 370/350, 370/400, 370/410, 370/420, 370/421, 370/432, 370/485-487, 370/496, 370/498, 370/503, 370/507, 370/510, 370/512, 370/514, 370/522, 370/524, 370/528, 379/219, 379/220, 455/524, 455/422, 455/426, 455/450, 455/517, 455/451, 455/452, 455/500, 455/501, 455/502, 455/507, 455/509, 455/510-513
• US Class Current: 370/337
• CPC Class Codes: H04Q 11/0421 Circuit arrangements therefor
• CPC Class Codes: H04Q 3/60 for connecting to satellites or concentrators which connect one or more exchange lines with a group of local lines

Abstract

A multi-host subscriber loop (10, 70) includes N central office terminals (22-26, 78) coupled to a local exchange (20, 76), where one of the N central office terminals (22, 110) is directly coupled to all other central office terminals (24-26, 112-114). M remote terminals (40-46, 100-104) are coupled to a plurality of telephone service subscribers. A single network facility (16, 76) is coupled between the M remote terminals and N central office terminals. The single network facility concentrates subscriber traffic, control information and associated signaling onto one message structure (60, 140). Messages in this message structure are transmitted between the remote terminals and central office terminals. The message structure includes a plurality of time slots, a first predetermined number of the time slots being allocated to N control channels, at least one time slot being allocated to associated signaling, and remaining time slots being allocated to subscriber traffic.

Claims

1. A subscriber loop, comprising:

a predetermined number of central office terminals coupled to a local exchange, a particular one of the central office terminals being coupled to each of the other central office terminals; and

a single network facility coupled to the particular one of the central office terminals to provide communications to and from subscribers, the single network facility supporting concentrated subscriber traffic, control information, and associated signaling onto one message structure and transmitting messages having the message structure to and from the particular one of the central office terminals, the particular one of the central office terminals operable to pass on messages according to their destination to the other central office terminals.

2. The subscriber loop, as set forth in claim 1, wherein the message structure includes a plurality of time slots, a first predetermined number of time slots being allocated to a first predetermined number of control channels, at least one time slot being allocated to associated signaling, and remaining time slots being allocated to subscriber traffic.

3. The subscriber loop, as set forth in claim 2, wherein subscriber traffic occupies one or more time slot per subscriber.

4. The subscriber loop, as set forth in claim 2, wherein time slot allocation to control, signaling, and subscriber traffic is not fixed to any predetermined location.

5. The subscriber loop, as set forth in claim 1, wherein the network facility includes a wireless communications medium.

6. The subscriber loop, as set forth in claim 1, wherein the network facility includes an optical communications medium.

7. The subscriber loop, as set forth in claim 1, wherein the network facility includes a metallic communications medium.

8. The subscriber loop, as set forth in claim 1, wherein one or more of the central office terminals is coupled directly to at least one telephone service subscriber.

9. The subscriber loop, as set forth in claim 1, wherein one of the central office terminals is coupled to at least one other network facility to form at least one other subscriber loop.

10. The subscriber loop, as set forth in claim 1, further comprising:

at least one additional central office terminal establishing an additional subscriber loop, the additional central office terminal and the particular one of the plurality of central office terminals coupled by an optical ring configuration.

11. A multi-host subscriber loop, comprising:

a plurality of remote terminals coupled to a plurality of telephone service subscribers, a particular one of the remote terminals being coupled to each of the other remote terminals;

a single network facility coupled to the particular one of the remote terminals, the single network facility concentrating subscriber traffic, control information and associated signaling onto one message structure and transmitting messages having the message structure to and from the particular one of the remote terminals, the message structure including a plurality of time slots, a first predetermined number of time slots being allocated to a plurality of control channels, at least one time slot being allocated to associated signaling, and remaining time slots being allocated to subscriber traffic, the particular one of the remote terminals operable to pass on messages according to their destination to the other remote terminals.

12. The subscriber loop, as set forth in claim 11, wherein time slot allocation to control, signaling, and subscriber traffic is not fixed to any predetermined location.

13. The subscriber loop, as set forth in claim 11, wherein the network facility includes a wireless communications medium.

14. The subscriber loop, as set forth in claim 11, wherein the network facility includes an optical communications medium.

15. The subscriber loop, as set forth in claim 11, wherein the network facility includes a metallic communications medium.

16. The subscriber loop, as set forth in claim 11, wherein each remote terminal is allocated a number of time slots in the message structure for subscriber traffic, wherein time slots are assigned to subscriber calls dynamically on a per call basis.

17. A method of transmitting subscriber traffic, control, and associated signaling between a plurality of central office terminals at a local exchange and a plurality of remote terminals at a subscriber location, comprising:

generating a frame structure having a plurality of time slots; and

allocating a predetermined number of the plurality of time slots to transmit subscriber traffic, control, and signaling of the plurality of remote terminals such that each remote terminal has a plurality of time slots allocated thereto;

partitioning the frame structure into a desired number of portions corresponding to a same desired number of remote terminals, each portion of the frame structure serving a particular one of the desired number of remote terminals, each portion of the frame structure having a first number of time slots for carrying subscriber traffic of a second number of subscribers supported by a particular remote terminal, the first number of time slots being less than the second number of subscribers.

18. The message structure, as set forth in claim 17, wherein the frame structure includes thirty-two time slots being transmitted at 2 Mb with thirty-one available for use, and at least thirty of the thirty-one time slots being allocated to transmit subscriber traffic, control, and signaling of the plurality of remote terminals.

19. The message structure, as set forth in claim 18, wherein a time slot 0 is unused for control or signaling.

20. The message structure, as set forth in claim 18, wherein a time slot 16 is used for signaling for all subscriber traffic.

21. The message structure, as set forth in claim 18, wherein a time slot 16 is not required for signaling for subscriber traffic.

22. The message structure, as set forth in claim 17, wherein the frame structure includes twenty-four time slots and one framing bit being transmitted at 1.5 Mb, the twenty-four time slots being allocated to transmit subscriber traffic, control, and signaling of the plurality of remote terminals.

23. The message structure, as set forth in claim 22, wherein the framing bit is not used for control or subscriber signal state synchronization.

24. The message structure, as set forth in claim 22, wherein a time slot 16 is used for signaling for all subscriber traffic.

25. The message structure, as set forth in claim 22, wherein a time slot 16 is not required for signaling for subscriber traffic.

26. The message structure, as set forth in claim 22, wherein a time slot 0 is unused for control or signaling.

27. The message structure, as set forth in claim 17, wherein X available subscriber traffic time slots are being concentrated onto Y network facility time slots allocated to each remote terminal at a X:

Y ratio, where X is greater than Y.

28. The message structure, as set forth in claim 17, wherein time slot allocation to control, signaling, and subscriber traffic is not fixed to any predetermined location.

29. The message structure, as set forth in claim 17, wherein a control channel for each remote terminal is carried in a first time slot of time slots allocated to each remote terminal.

30. The message structure, as set forth in claim 17, wherein a control channel for each remote terminal is carried in a time slot at a predetermined position within time slots allocated to each remote terminal.

31. The message structure, as set forth in claim 17, wherein each remote terminal is allocated a number of time slots in the message structure for subscriber traffic, wherein time slots are assigned to subscriber calls dynamically on a per call basis.

32. A central office terminal, comprising:

a first interface operable to receive information from and send information to a plurality of remote terminals over a transport medium, the plurality of remote terminals each providing a communication capability for a plurality of subscribers;

an extraction unit operable to extract and identify information for processing, the first interface operable to send information identified by the extraction unit as being received from a first one of the plurality of remote terminals to a processor in the central office terminal;

a second interface operable to send information identified by the extraction unit as being received from a second one of the plurality of remote terminals for processing by a second central office terminal, the second interface operable to receive information from the second central office terminal, the second interface operable to pass information received from the second central office terminal to the first interface for transfer over the transport medium to the second one of the plurality of remote terminals, wherein the first interface is associated with the first one of the plurality of remote terminals and the second interface is associated with the second one of the plurality of remote terminals.

33. The central office terminal of claim 32, further comprising:

a third interface operable to send information identified by the extraction unit as being received from a third one of the plurality of remote terminals for processing by a third central office terminal, the third interface operable to pass information received by the third central office terminal to the first interface for transfer over the transport medium to the third one of the plurality of remote terminals, wherein the second and third central office terminals have access to the transport medium only through the first interface.

34. The central office terminal of claim 33, wherein the first interface receives information associated with the first, second, and third remote terminals, the extractor unit being operable to extract information associated with the second remote terminal and the third remote terminal to allow the second interface to pass the information associated with the second remote terminal to the second central office terminal and to allow the third interface to pass the information associated with the third remote terminal to the third central office terminal.

35. The central office terminal of claim 32, wherein the transport medium is a wireless communication link.

36. The central office terminal of claim 32, further comprising:

a local exchange interface operable to process information identified by the extraction unit for transfer to a local exchange carrier.

37. The central office terminal of claim 36, wherein the local exchange interface is operable to receive information from the local exchange carrier, the local exchange interface operable to pass on the information received from the local exchange carrier to the first interface for transfer over the transport medium.

38. The central office terminal of claim 37, wherein the local exchange interface is operable to pass on information received from the local exchange carrier to the second interface for transfer to the second central office terminal.

39. The central office terminal of claim 32, wherein the first interface is operable to generate a message structure for transfer over the transport medium, the message structure including concentrated subscriber traffic, control information, and associated signaling allocated in a plurality of time slots.

40. The central office terminal of claim 39, wherein the message structure is partitioned into a desired number of portions corresponding to a number of remote terminals serviced by the transport medium.

41. A central office terminal, comprising:

a first interface operable to receive information from and send information to a transport medium;

an extraction unit operable to extract and identify information for processing;

a second interface operable to send information identified by the extraction unit for processing by a second central office terminal, the second interface operable to receive information from the second central office terminal, the second interface operable to pass information received from the second central office terminal to the first interface for transfer over the transport medium, wherein the first interface is operable to generate a message structure for transfer over the transport medium, the message structure including concentrated subscriber traffic, control information, and associated signaling allocated in a plurality of time slots, wherein each portion of the message structure has a first number of time slots for carrying subscriber traffic of a second number of subscribers associated with the corresponding remote terminal, the first number of time slots being less than the second number of subscribers.