System and method for a multi-host subscriber loop

• US 5,881,059 A
• Filed: 05/23/1996
• Issued: 03/09/1999
• Est. Priority Date: 11/16/1995
• 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): Olms, Douglas W.
• Assistant Examiner(s): RAO, SEEMA SRINIVAS
• Application Number:
  US08/652,157
• Time in Patent Office: 1,020 Days
• Field of Search: 370/327-330, 370/336, 370/337, 370/338, 370/340-345, 370/347, 370/348, 370/350, 370/400, 370/410, 370/420, 370/421, 370/432, 370/485, 370/486, 370/487, 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, 455/511-513
• 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 first predetermined number 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 second 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 only between the particular one of the remote terminals and the particular one of the central office terminals, the single network facility supporting concentrated subscriber traffic, control information, and associated signaling onto one message structure and transmitting messages having the message structure between the particular one of the remote terminals and the particular one of the central office terminals, the particular one of the remote terminals and the particular one of the central office terminals operable to pass on messages according to their destination to the other remote terminals and the other central office terminals, respectively.

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 the message structure is transmitted across a 2 Mb transmission medium conforming to the general ITU-T G.703 recommendations.

4. The subscriber loop, as set forth in claim 2, wherein the message structure is transmitted across a 1.5 Mb transmission medium.

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

6. The subscriber loop, as set forth in claim 2, wherein a first predetermined number of time slots are further allocated to signaling associated with the subscriber traffic.

7. 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.

8. The subscriber loop, as set forth in claim 2, wherein a control channel for each remote terminal is carried in a first time slot of time slots allocated to each remote terminal.

9. The subscriber loop, as set forth in claim 2, 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.

10. The subscriber loop, as set forth in claim 2, further comprising a subscriber terminal coupled to each remote terminal, the subscriber terminals receiving and transmitting the messages from and to the central office terminals.

11. The subscriber loop, as set forth in claim 10, wherein the subscriber terminals further separate the received message into a first message, E1_CS, having a control channel, and multiple second messages, E1_ST, having bearer channels, each subscriber terminal transmitting/receiving one E1_CS or E1_ST to/from a respective remote terminal.

12. The subscriber loop, as set forth in claim 11, wherein the first message, E1_CS, being transmitted/received by a first subscriber terminal is reassigned to a second subscriber terminal in case of failure of the first subscriber terminal.

13. The subscriber loop, as set forth in claim 1, wherein the first predetermined number of remote terminals is equal to the second predetermined number of central office terminals.

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

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

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

17. 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.

18. The subscriber loop, as set forth in claim 1, wherein the central office terminals include a first central office terminal being coupled to the network facility, the first central office terminal further being substantially directly coupled to each of remaining central office terminals, each of the second predetermined number of central office terminals being coupled to a local exchange.

19. The subscriber loop, as set forth in claim 18, wherein the network facility further comprises:

a radio and modem coupled to the first central office terminal for transmitting and receiving the messages having the message structure; and

at least one subscriber terminal coupled to each remote terminal receiving and transmitting the messages having the message structures.

20. The subscriber loop, as set forth in claim 1, wherein the remote terminals are coupled to one another.

21. The subscriber loop, as set forth in claim 1, wherein the remote terminals include a first remote terminal being coupled to the network facility, the first remote terminal further being substantially directly coupled to each of remaining remote terminals, each of the first predetermined number of remote terminals being coupled to a plurality of subscribers.

22. 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 and remote terminals to form at least one other subscriber loop.

23. The subscriber loop, as set forth in claim 1, wherein one of the central office terminals and one of the remote terminals are in a point-to-point subscriber loop configuration.

24. The subscriber loop, as set forth in claim 1, wherein one of the central office terminals and one of the remote terminals are in a point-to-multi-point subscriber loop configuration.

25. The subscriber loop, as set forth in claim 1, 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.

26. A multi-host subscriber loop, comprising:

a plurality of central office terminals coupled to a local exchange, a particular one of the central office terminals being directly coupled to all other central office terminals;

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 only between the particular one of remote terminals and the particular one of the central office terminals, the single network facility concentrating subscriber traffic, control information and associated signaling onto one message structure and transmitting messages having the message structure between the particular one of the remote terminals and the particular one of the central office 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 and the particular one of the central office terminals operable to pass on messages according to their destination to the other remote terminals and the other central office terminals, respectively.

27. The subscriber loop, as set forth in claim 26, wherein the message structure is transmitted across a 2 Mb transmission medium.

28. The subscriber loop, as set forth in claim 26, wherein the message structure is transmitted across a 1.5 Mb transmission medium.

29. The subscriber loop, as set forth in claim 26, wherein the time slots are further allocated to signaling associated with said subscriber traffic.

30. The subscriber loop, as set forth in claim 26, wherein said time slot allocation to control, signaling, and subscriber traffic is not fixed to any predetermined location.

31. The subscriber loop, as set forth in claim 26, wherein a control channel for each remote terminal is carried in a first time slot of time slots allocated to each terminal.

32. The subscriber loop, as set forth in claim 26, wherein a control channel for each remote terminal is carried in a time slot at a predetermined position within time slots allocated to each terminal.

33. The subscriber loop, as set forth in claim 26, wherein a number of remote terminals equals a number of central office terminals.

34. The subscriber loop, as set forth in claim 26, wherein the network facility includes a wireless communications medium.

35. The subscriber loop, as set forth in claim 26, wherein the network facility includes an optical communications medium.

36. The subscriber loop, as set forth in claim 26, wherein the network facility includes a metallic communications medium.

37. The subscriber loop, as set forth in claim 26, wherein only the particular one of the central office terminals directly coupled to all other central office terminals is coupled to the network facility.

38. The subscriber loop, as set forth in claim 26, wherein only a particular one of the remote terminals is coupled to the network facility, the particular one of the remote terminals being further directly coupled to each one of the other remaining remote terminals.

39. The subscriber loop, as set forth in claim 26, wherein the network facility further comprises:

a radio and modem coupled to the particular one of the central office terminals directly coupled to all other central office terminals for transmitting and receiving the messages having the message structure; and

at least one subscriber terminal coupled to each remote terminal receiving and transmitting the messages having the message structures.

40. The subscriber loop, as set forth in claim 26, 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.