Signal receiving and transmitting unit for converting a transmission rate of a received signal to a transmission rate of a transmittted signal

• US 5,604,739 A
• Filed: 10/11/1994
• Issued: 02/18/1997
• Est. Priority Date: 10/12/1993
• Status: Expired due to Term

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Jiang, Hao, Lindblom, Mats L. B., Buhrgard, Karl S. M., Tingsborg, Johan U.
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): Nguyen, Chau T.
• Application Number:
  US08/320,660
• Time in Patent Office: 861 Days
• Field of Search: 370/60, 370/60.1, 370/58.1, 370/84, 370/112, 370/66, 370/118, 370/68
• US Class Current: 370/468
• CPC Class Codes: H04J 3/047 Distributors with transistors or integrated circuits
• CPC Class Codes: H04J 3/247 ATM or packet multiplexing
• CPC Class Codes: H04L 2012/5672 Multiplexing, e.g. coding, scrambling
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

A signal receiving and a signal transmitting unit converts an information carrying signal received at a first transmission rate to an information carrying signal transmitted at a second transmission rate that differs from the first transmission rate. Several inputs and outputs are available, each input structured for a transmission rate that is different from the transmission rates of remaining inputs, and each output structured for a transmission rate that is different from the transmission rates of remaining outputs. One signal receiving input can be connected to one signal transmitting output depending on signals occurring on one or more control conductors, wherein a selected control conductor and/or selected signal information selects and initiates a conversion mode having a selected conversion index.

Claims

1. A signal receiving and signal transmitting unit for converting a first transmission rate of a received information carrying signal to a second transmission rate of a transmitted information carrying signal that is different from the first transmission rate, said unit comprising:

a plurality of signal receiving inputs for receiving information carrying signals, wherein each input is structured to receive information carrying signals at a different rate;

a plurality of signal transmitting outputs for transmitting information carrying signals, wherein each output is structured to transmit information carrying signals at a different rate;

at least one control conductor for supplying control information indicative of a conversion mode to be applied to said received information carrying signals;

control logic for receiving said control information and selecting a corresponding conversion mode;

a memory for receiving said information carrying signals from said inputs; and

a buffer circuit for recieving said information carrying signals from said memory and outputting said information carrying signals to said signal transmitting outputs under control of said control logic,

wherein the control logic connects one signal receiving input to one signal transmitting output based on said control information, and the unit performs rate conversion, using the control logic, the memory and the buffer circuit, in said selected conversion mode.

2. A signal receiving and signal transmitting unit for converting a first transmission rate of a received information carrying signal to a second transmission rate of a transmitted information carrying signal that is different from the first transmission rate, said unit comprising:

a plurality of signal receiving inputs for receiving information carrying signals, wherein each input is structured for a different transmission rate;

a plurality of signal transmitting outputs for transmitting information carrying signals, wherein each output is structured for a different transmission rate;

at least one control conductor for supplying control information indicative of a conversion mode to be applied to said received information carrying signals; and

a number of multiplexing/demultiplexing blocks for converting said first transmission rate of said received information carrying signal to said second transmission rate of said transmitted information carrying signal,

wherein the unit connects one signal receiving input to one signal transmitting output depending on the control information, and the unit performs conversion, using said multiplexing/demultiplexing blocks in a conversion mode having a conversion index that is selected and initiated by the control information.

3. A unit according to claim 2, wherein a received information carrying signal and a transmitted information carrying signal are comprised of data packets or data cells, each data packet including at least an addressable part and an information carrying part.

4. A unit according to claim 3, wherein the inputs and outputs contain a number of conductors and are structured for a transmission rate that increases by a factor of four, with the number of conductors decreasing by a factor of four.

5. A unit according to claim 3, wherein the inputs and outputs are structured for three different transmission rates.

6. A unit according to claim 3, wherein the unit converts received data cells to an internal parallel format that is chosen commonly for each input and each output.

7. A unit according to claim 2, wherein the inputs and outputs contain a number of conductors and are structured for transmission rates that increase by a factor of four, with the number of conductors decreasing by a factor of four.

8. A unit according to claim 7, wherein respective inputs and outputs are structured for both receiving and transmitting traffic.

9. A unit according to claim 8, wherein the unit converts a received information carrying signal to an internal parallel format that is chosen commonly for each input and each output.

10. A unit according to claim 7, wherein the unit converts a received information carrying signal to an internal parallel format that is chosen commonly for each input and each output.

11. A unit according to claim 2, wherein the inputs and outputs are structured for three different transmission rates.

12. A unit according to claim 11, wherein the unit converts a received information carrying signal to an internal parallel format that is chosen commonly for each input and each output.

13. A unit according to claim 2,

wherein said number of multiplexing/demultiplexing blocks converts received, low transmission rate signals from the plurality of inputs to a signal having a transmission rate that is four times higher than said low transmission rate.

14. A unit according to claim 13, wherein a multiplexing/demultiplexing block comprises:

a first stage in a series-parallel circuit for converting an input signal;

a memory for storing the signal converted by the first stage;

a buffer circuit for receiving and outputting the stored converted signal; and

a parallel-series converter having a clock pulse converter for receiving the signal output from the buffer circuit.

15. A unit according to claim 14, wherein memories and buffer circuits are used for transmitting signals in one direction for multiplexing and in another direction for demultiplexing.

16. A unit according to claim 14, wherein the unit converts a received information carrying signal to an internal parallel format that is chosen commonly for each input and each output.

17. A unit according to claim 13, wherein the unit converts a received information carrying signal to an internal parallel format that is chosen commonly for each input and each output.

18. A unit according to claim 2, wherein the unit converts a received information carrying signal to an internal parallel format that is chosen commonly for each input and each output.

19. A unit according to claim 18, wherein a clock pulse rate for processing signals with the internal parallel format is lower than a clock pulse rate applicable to signals at the inputs and outputs.

20. A unit according to claim 19, wherein one of the plurality of inputs is connected to one of the plurality of outputs via synchronizing logic, the memory, the buffer circuit, and control logic.

21. A unit according to claim 2, wherein a total signal bandwidth for incoming signals corresponds to a total signal bandwidth for outgoing signals.