System for controlling multiple line cards on a TDM bus

• US 5,105,421 A
• Filed: 12/15/1989
• Issued: 04/14/1992
• Est. Priority Date: 12/15/1989
• Status: Expired due to Term

• Current Assignee: Alcatel Network Systems India Limited (Nokia Corporation)
• Original Assignee: Alcatel SA (Nokia Corporation)
• Inventors: Gingell, Michael J.
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): Jung, Min
• Application Number:
  US07/451,431
• Time in Patent Office: 851 Days
• Field of Search: 370/67, 370/85.1, 370/85.7, 370/95.1, 370/85.9, 370/58.1
• US Class Current: 370/363
• CPC Class Codes: H04J 3/0685 Clock or time synchronisation in a node; Intranode synchronisation
• CPC Class Codes: H04Q 11/04 for time-division multiplexing H04Q11/0001 takes precedence

Abstract

In a TDM telecommunications terminal, wherein multiple line cards are connected to a TDM bus, each line card location is provided with an identification code. A processor controlled circuit generates a programmable sequence of identification codes which are transmitted on a configuration bus in time slots synchronized with the time slots of the TDM bus. The configuration bus is connected to each of the line cards, which include a comparator logic circuit for comparing the identification of the line card location to the identification codes provided on the configuration bus. When a match is detected, the line card is enabled and is given access to the TDM bus. Through the programmable reassignment of time slots to line cards, concentration may be provided by the system, and a plurality of time slots may be assigned to a single line card to provide broad band service.

Claims

1. A system for multiplexing information from a plurality of ports each having a physical position identification code onto a TDM bus for transmitting said information in time slots on said bus, said system comprising:

a processor controlled means for selectively generating and outputting physical position identification codes during time slots of said TDM bus;

a distributing means connected to said processor controlled means for distributing said physical position identification codes through said system; and

connecting means associated with each of said ports for connecting information from said ports to said TDM bus, each said connecting means assuming the physical position identification code of the associated port and being connected to said distributing means, said connecting means being responsive to the presence of its assumed physical position identification code on said distributing means to connect the information from its associated port to the TDM bus, whereby each connecting means connects information from its associated port to said TDM bus in a time slot when said physical position identification code on said distributing means matches its physical position identification code assumed by the connecting means.

2. A system as described in claim 1, wherein said TDM bus has first and second lines for transmitting and receiving information respectively, and said system is further suitable for receiving and demultiplexing information form time slots on said receiving line of said TDM bus, each connecting means being further responsive to its assumed physical position identification code on said distributing means to connect information from a time slot on said TDM bus to its associated port.

3. A system as described in claim 1, wherein said system is adapted for telecommunications, and each of said ports is connected to a subscriber line.

4. A system as described in claim 3, wherein at least one of said subscriber lines comprises a tip and ring pair for conveying analog information signals.

5. A system as described in claim 1, wherein each connecting means further comprises means connected to said ports for converting said information to PCM format for transmission on said TDM bus.

6. A system as described in claim 2, wherein each connecting means further comprises means connected to said ports for converting said information to PCM format for transmission on said TDM bus and means connected to said receive line of each TDM bus for converting PCM format information in time slots to analog information for said ports.

7. A system as described in claim 1, wherein the distributing means comprises a separate physical position identification code bus.

8. A system as described in claim 2, wherein the distributing means comprises a separate physical position identification code bus.

9. A system as described in claim 7, wherein said processor controlled means further comprises a timing generator connected to each connecting means for generating timing signals corresponding to said time slots on said TDM bus.

10. A system as described in claim 9, wherein said processor controlled means comprises a random access memory connected to said timing generator and said physical position identification code bus for storing said identification codes to be distributed through said system.

11. A system as described in claim 10, wherein said processor controlled means further comprises a microprocessor connected to said random access memory for loading said physical position identification codes into said random access memory.

12. A system as described in claim 11, wherein said processor controlled means further comprises a register connected to said random access memory and said physical position identification code bus, said register receiving physical position identification codes in parallel from said random access memory and providing said physical position identification codes to said physical position identification code bus in serial form.

13. A system as described in claim 8, wherein said processor controlled means further comprises a timing generator connected to each connecting means for generating timing signals corresponding to said time slots on said TDM bus.

14. A system as described in claim 13, wherein said processor controlled means comprises a random access memory connected to said timing generator and said physical position identification code bus for storing said physical position identification codes to be distributed through said system.

15. A system as described in claim 14, wherein said processor controlled means further comprises a microprocessor connected to said random access memory for loading said identification codes into said random access memory.

16. A system as described in claim 15, wherein said processor controlled means further comprises a register connected to said random access memory and said physical position identification code bus, said register receiving physical position identification codes in parallel from said random access memory and providing said physical position identification codes to said physical position identification code bus in serial form.

17. A system as described in claim 2, wherein said system is adapted for telecommunications, and each of said ports is connected to a subscriber line.

18. A system as described in claim 9, wherein said timing signals comprise a byte clock having a rising and a falling edge, said rising edge corresponding to the beginning of a time slot.

19. A system as described in claim 1, wherein said assumed Physical Position identification codes for the connecting means are multi-digit binary numbers and are fixed in said connecting means.

20. A system as described in claim 3, wherein each connecting means is a line card inserted in a connector in a line shelf.

21. A system as described in claim 20, wherein said assumed physical position identification codes are multi-digit binary numbers established for each connector of a line shelf by hard-wiring multiple sockets of each connector to 1 and 0 logic level signals to form the physical position identification code.

22. A system as described in claim 1, wherein each connecting means further comprises:

comparator means for comparing the assumed physical position identification code of the connecting means with the physical position identification code on the distributing means, and for providing an output in response to a match; and

gating means connected to the comparator means and responsive to the output therefrom for connecting the information from the port to the TDM bus.

23. A system as described in claim 2, wherein each connecting means further comprises:

comparator means for comparing the assumed physical position identification code of the connecting means with the physical position identification code on the distributing means, and for providing an output in response to a match; and

gating means connected to the comparator means and responsive to the output therefrom for connecting the information from its associated port to the TDM bus and for connecting the information from a time slot on said TDM bus to its associated port.

24. A system as described in claim 1, wherein the time slots have predetermined bandwidth, and said processor controlled means generates and outputs the same physical position identification code during a plurality of adjacent time slots, whereby a greater bandwidth is provided to the port associated with the connecting means whose identification code was outputted in multiple time slots.

25. A system as described in claim 2, wherein the time slots have predetermined bandwidth, and said processor controlled means generates and outputs the same physical position identification code during a plurality of adjacent time slots, whereby a greater bandwidth is provided to the port associated with the connecting means whose physical position identification code was outputted in multiple time slots.

26. A system as described in claim 1, wherein there are more ports than time slots, and concentration is provided.

27. A system as described in claim 2, wherein there are more ports than time slots, and concentration is provided.