Streaming segmentation and reassembly in asynchronous transfer mode communications
View Patent ↗Systems, methods, and apparatuses are provided that enable streaming of ATM cells between a transmit/receive data processing application and a transmission convergence function. Data to be segmented into an ATM cell is received at a SAR engine, and provided to a transmission convergence function, with the first cells transmitted to the transmission convergence function before the SAR function receives an end-of-packet indication from the optimization engine. Data received at a transmission convergence function is placed in a received packet queue at the SAR function, with packets provided to an application after a start-of-packet indication is received, and before an end-of-packet indication is received, at the SAR function.
1. A method for transmitting data over a network, comprising:
receiving data at a data streaming component, the data received as part of a data stream having a start of packet indicator and an end of packet indicator;
placing information from the data stream into a plurality of cells, wherein the information is placed into a first cell before the end of packet indicator is received at the data streaming component;
transmitting the plurality of the cells, the first cell transmitted from the data streaming component before end of packet indicator is received at the data streaming component; and
when the end of packet indicator is received, setting an end of packet indicator received bit in the final cell.
2. The method of claim 1 , wherein the data streaming component receives the data stream from a data receiving component.
3. The method of claim 1 , wherein the data streaming component is a segmentation and reassembly application.
4. The method of claim 1 , wherein said transmitting comprises transmitting the cells to a data transmission component.
5. The method of claim 4 , wherein the steps of processing data by the data streaming component are performed by an Field Programmable Gate Array (FPGA).
6. The method of claim 1 , wherein each cell comprises up to 48 bytes in a cell payload.
7. The method of claim 6 , wherein the final cell includes an 8 octet trailer.
8. A method for receiving data from a network, comprising:
receiving a plurality of cells at a data receiving component and sending them to a data streaming component, the cells received as part of a packet cell stream having a start-of-packet indicator and an end-of-packet indicator;
the data streaming component placing the cells into a receive cell queue, detecting the start-of-packet indicator in one of the cells in the receive cell queue and sending an indication of start of packet to a data transmission component;
the data streaming component transmitting the cells to the data transmission component, a first cell transmitted to the data transmission component from the data streaming component before the end-of-packet indicator is received at the data streaming component; and
when the data streaming component receives the end-of-packet indicator, providing an indication of end of packet to the data transmission component.
9. The method of claim 8 , wherein the data transmission component comprises an optimization decoder.
10. The method of claim 8 , further comprising:
receiving cells from the received cell queue at the data streaming component; and
assembling a plurality of the cells from the received cell queue into a packet cell stream at the data streaming component.
11. The method of claim 8 , wherein the data streaming component is operable to perform segmentation and reassembly based on ATM Adaptation Layer Type 5 ATM cells.
12. The method of claim 11 , wherein the data receiving component, the data streaming component, and the data transmission component are provided by a Field Programmable Gate Array (FPGA).
13. The method of claim 8 , wherein each cell placed into the received cell queue comprises a 48-byte payload.
14. The method of claim 13 , wherein a final cell includes the indication of end of packet as a payload type indicator bit which is set to indicate that the cell is the final cell in the packet cell stream, and the final cell includes a trailer.
15. An network device, comprising:
a memory device;
a processing device; and
a network interface device comprising a data transmission component that operates to prepare a packet of data for transmission across the network, a data streaming component that operates to divide the packet of data into a plurality of cells to form a packet cell stream, and a data receiving component;
the data streaming component providing a portion of the packet of data into a first cell before receiving an end-of-packet indicator for the packet of data, and providing the first cell to the data transmission component before receiving the end-of-packet indicator for the packet of data.
16. The network device of claim 15 , wherein the data transmission component is comprised of one or both of a codec application and a data compression application.
17. The network device of claim 15 , wherein the data transmission component operates to convert data formatted for use by the network interface into data for use by the network.
18. The network device of claim 15 , wherein the data receiving component includes a receive data processing application, the data streaming component includes a segmentation and reassembly module, and the data transmission component includes a transmission convergence module.
19. The network device of claim 18 , wherein the receive data processing module is comprised of one or both of a codec application and a data compression application.
20. The network device of claim 18 , wherein the transmission convergence module operates to convert network formatted data into a format that can be used by the network interface.