System and method for multiplexing PDH and packet data

• US 7,782,812 B2
• Filed: 01/11/2005
• Issued: 08/24/2010
• Est. Priority Date: 01/11/2005
• Status: Active Grant

• Current Assignee: Harris Stratex Networks, Inc.
• Original Assignee: Harris Stratex Networks, Inc.
• Inventors: Jao, Tjo San
• Primary Examiner(s): Jain; Raj
• Application Number:
  US11/032,078
• Publication Number:
  US 20060153244A1
• Time in Patent Office: 2,051 Days
• Field of Search: None
• US Class Current: 370/321
• CPC Class Codes: H04J 3/0685 Clock or time synchronisation in a node; Intranode synchronisation
• CPC Class Codes: H04J 3/073 Bit stuffing, e.g. PDH
• CPC Class Codes: H04J 3/1623 Plesiochronous digital hierarchy [PDH]
• CPC Class Codes: H04J 3/247 ATM or packet multiplexing

Abstract

A method of efficiently combining data from at least a plurality of a first type of data source and a second type of data source. The method comprises synchronizing the plural first type of data sources to thereby generate a synchronized data rate, providing a frame having plural bit positions, assigning the synchronized first type of data in ones of the bit positions of the frame, and arranging the second type of data in the frame as a function of the synchronized data rate.

Claims

1. A method of transmitting data by a communication system comprising steps of:

receiving first type payload data and second type payload data, the first type payload data including two data streams corresponding to different clocks;

synchronizing, with a synchronizer, the received first type payload data thereby generating a synchronized data rate;

assigning the synchronized first type payload data in bit positions of a frame;

distributing the second type payload data in unassigned bit positions of the frame as a function of the synchronized data rate; and

transmitting the frame wherein the frame includes plural sub-frames with plural blocks and sub-blocks, each sub-block including a synchronized first type payload data bit position or a second type payload data bit position and each block having at least one overhead bit position;

inserting a frame alignment word in bit positions of a first block of the plural blocks and sub-blocks of the first sub-frame; and

distributing synchronized first type payload data bits or second type payload data bits in unused overhead bit positions of other blocks.

2. The method of claim 1 wherein a number of sub-frames correlates to a number of first type sources.

3. The method of claim 1 further comprising the step of distributing stuffing indication bits in unused overhead bit positions.

4. The method of claim 1 further comprising the step of distributing parity bits in unused overhead bit positions.

5. The method of claim 1 further comprising the step of:

filling in unassigned data bit positions with second type payload data bits.

6. The method of claim 1 wherein the first type payload data includes at least one of synchronous, asynchronous, and plesiochronous data.

7. The method of claim 1 wherein the second type payload data includes a packet data.

8. The method of claim 1 wherein the synchronized first type payload data and second type payload data is assigned by sequential bit interleaving.

9. The method of claim 1 wherein the received first type payload data is synchronized by bit stuffing.

10. A method for transmitting a predetermined frame format by a communication system comprising steps of:

receiving data from a plurality of sources including first type payload data from at least one first type data source and second type payload data from a second type data source;

synchronizing, with a synchronizer, the received first type payload data to thereby generate a synchronized data rate; and

transmitting the synchronized first type payload data and received second type payload data in a predetermined frame format, wherein the second type payload data is assigned in the predetermined frame format as a function of the synchronized data rate wherein the frame includes plural sub-frames with plural blocks and sub-blocks, each sub-block including a synchronized first type payload data bit position or a second type payload data bit position and each block having at least one overhead bit position;

inserting a frame alignment word in bit positions of a first block of the plural blocks and sub-blocks of the first sub-frame; and

distributing synchronized first type payload data bits or second type payload data bits in unused overhead bit positions of other blocks.

11. The method of claim 10 wherein at least one first type payload data includes at least one of synchronous, asynchronous, and plesiochronous data.

12. The method of claim 10 wherein the second type payload data includes a packet data.

13. The method of claim 10 further comprising the step of sequentially bit interleaving synchronized first type payload data and second type payload data in the frame format.

14. A method of combining data from plural first type data sources and at least one second type data source by a communication system comprising steps of:

synchronizing, with a synchronizer, first type payload data from plural first type data sources to thereby generate a synchronized data rate;

assigning the synchronized first type payload data in bit positions of a frame; and

arranging second type payload data from a second type data source in the frame as a function of the synchronized data rate to thereby combine payload data from different types of data into the frame wherein the frame includes plural sub-frames with plural blocks and sub-blocks, each sub-block including a synchronized first type data bit position or a second type data bit position and each block having at least one overhead bit position;

inserting a frame alignment word in bit positions of a first block of the plural blocks and sub-blocks of the first sub-frame; and

distributing synchronized first type payload data bits or second type payload data bits in unused overhead bit positions of other blocks.

15. The method of claim 14 further comprising the step of:

filling in unassigned bit positions with second type payload data bits from a second type data source.

16. The method of claim 14 wherein a number of sub-frames correlates to a number of received first type sources.

17. The method of claim 14 further comprising the step of distributing stuffing indication bits in unused overhead bit positions.

18. The method of claim 14 further comprising the step of distributing parity bits in unused overhead bit positions.

19. The method of claim 14 wherein the first type payload data includes at least one of synchronous, asynchronous, and plesiochronous data.

20. The method of claim 14 wherein the second type payload data includes packet data.

21. The method of claim 14 wherein the synchronized first type payload data and second type payload data is assigned by sequential bit interleaving.

22. The method of claim 14 wherein the plural first type data sources are synchronized by bit stuffing.