Embedded control data in communications systems
Systems and methods can operate to transmit embedded control data (ECD) information within the payload of packet data. Payload packet data can contain a plurality of data elements of equal value. A transmitter can replace the repeating data elements with ECD information. A receiver can extract the ECD information and replace with the repeating data value to reconstruct the original. ECD information can be communicated between communication systems and between interfaces within a communication system.
1. A system comprising:
a first buffer operable to receive a packet data stream;
a second buffer operable to receive embedded control data associated with the packet data stream;
a selected pattern data value comprising a repeating pattern found in a packet of the packet data stream and having defined and aligned boundaries;
a pattern sniffer operable to detect a plurality of locations in the received packet data stream equal to the selected pattern data value;
an inserter operable to instruct a combiner to select one of a first and second input to generate an output data packet stream, the first input of the inserter comprising output from the first buffer and the second input of the inserter is output from the second buffer, the output of the second buffer comprising the embedded control data to be substituted for the selected pattern data value, the embedded control data including a pointer associated with a location of a next instance of the embedded control data thereby creating a linked list identifying each instance of the selected data pattern value in the packet data stream.
2. The system of claim 1 , wherein the received packet data stream comprises embedded control data information.
3. The system of claim 2 , wherein the selected pattern data value is determined through inspecting a plurality of received packet data streams.
4. The system of claim 3 , wherein embedded control data is used to transmit the selected pattern data value to a receiver.
5. The system of claim 1 , wherein the second buffer is operable to provide notification wherein the received packet data stream cannot be buffered.
6. The system of claim 1 , wherein expiration of a latency timer results in the system transmitting the output packet data stream.
7. The system of claim 1 , wherein a medium used to transmit the output packet data stream comprises a back plane.
8. The system of claim 7 , wherein a serial packet interface (SPI) protocol is used for transmission of the output packet data stream.
9. The system of claim 1 , wherein the medium to transmit the output packet data stream comprises a communications link.
10. The system of claim 9 , wherein an Ethernet protocol is used for the transmission.
11. A system comprising;
a detector operable to receive a packet data stream and to identify embedded control data in the packet data stream;
an extractor operable to receive the packet data stream and to extract the identified embedded control data from said packet data stream;
a selected pattern data value comprising a repeating pattern found in a packet of the packet data stream and having defined and aligned boundaries; and
a data selector operable to produce an output data stream comprising either payload data or the selected pattern data value, depending on the identified embedded control data; and
wherein the identified embedded control data received in the packet data stream comprises a pointer that identifies a location of a next data element of the embedded control data in the received packet data stream thereby creating a linked list identifying each instance of the selected data pattern value in the packet data stream.
12. The system of claim 11 , wherein the selected pattern data value is determined through information contained in the packet data stream.
13. The system of claim 11 , wherein a first data element of the receive packet data stream comprises a header identifying the receive packet data stream and includes the embedded control data.
14. The system of claim 13 , wherein a last data element of data of the embedded control data in the receive packet data stream comprises a pointer wherein the pointer references itself.
15. A computer-implemented method comprising:
receiving an input packet data stream;
receiving control data to be embedded in the input packet data stream;
identifying locations in the input packet data stream comprising at least one repeating data pattern identified within the input packet data stream; and
generating a output packet data stream comprising the input packet stream and the control data, wherein the repeating data pattern in the input packet stream are replaced with embedded control data, the embedded control data marking the repeating data pattern and identifying a location associated with a next instance of the embedded control data in the output packet data stream thereby creating a linked list identifying each instance of a selected data pattern in the packet data stream.
16. The method of claim 15 , further comprising:
receiving the output packet data stream;
extracting the embedded control data from the output packet data stream; and
extracting the input packet stream wherein the packet locations used for the embedded control data are replaced with the repeating data pattern.
17. The method of claim 15 , wherein a first data element of the output packet stream is a header comprising embedded control data information and a pointer wherein the pointer references the next location in the output packet comprising embedded control data information.
18. The method of claim 15 , wherein a last embedded control data element in the output packet comprises embedded control data information and a pointer wherein the pointer references the location of the last embedded control data information location in the output packet.
19. The method of claim 15 , wherein the repeating data pattern is determined through inspecting a plurality of received packet data streams.