TWO AND THREE-STROKE DISCOVERY PROCESS FOR 10G-EPONS
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Abstract
The invention relates to a method to discover Optical Network Units (ONU) with different speed capabilities in an Ethernet Passive Optical Network (EPON) by an Optical Line Termination (OLT), where logical links in the network are identified by Logical Link IDs, and the OLT can transmit and receive data with 1 Gbit/s-speed (1 G) and 10 Gbit/s-speed (10 G), and the discovery process is handled in the OLT by a Multi Point Control Process (MPCP), which exchanges messages as Data Units (MPCPDU) with the ONUs. This is achieved by extending the standard MPCPDUs in a way, that backward compatability is assured.
31 Citations
20 Claims
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1-10. -10. (canceled)
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11. A method for discovering Optical Network Units (ONU) with different speed capabilities in an Ethernet Passive Optical Network (EPON) by an Optical Line Termination (OLT), wherein:
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logical links in the network are identified by Logical Link IDs (LLID); the OLT is capable of transmitting and receiving data at a 1 Gbit/s-speed (1 G) and 10 Gbit/s-speed (10 G); and the discovery process is handled in the OLT by a Multi Point Control Process (MPCP), which exchanges messages as Data Units (MPCPDU) with the ONUs; the method which comprises; associating a 10 G and a 1 G Downstream (DS) transmission channel with the ONUs; transmitting for 1 G-ONUs a Discovery GATE MPCPDU (dGATE) by the OLT; transmitting for 10 G-ONUs an extended Discovery GATE MPCPDU (eGATE) by the OLT; carrying one Discovery Window (DW) by the extended Discovery GATE MPCPDU (eGATE), if only 1 G Upstream (US) capable ONUs are present, which is coded in a Flags Field (FF) and an Option Field (OF); carrying two Discovery Windows (DW) by the extended Discovery GATE MPCPDU (eGATE), if only 10 G Upstream (US) capable ONUs or if 1 G and 10 G Upstream (US) capable ONUs are present, which is coded in a Flags Field (FF) and an Option Field (OF); responding by a 1 G-ONU within the 1-G-DW with a register request MPCPDU (REQ); responding by a 10 G-ONU or by a mixed 1 G/10 G-ONU within the 10-G-DW with a extended register request MPCPDU (eREQ); notifying the 1 G-ONU with a register MPCPDU (REG) or the 10 G capable ONU with the extended register MPCPDU (eREG) by the OLT about an allocated LLID; acknowledging the LLID with a register ACK MPCPDU (ACK) by a 1 G-ONU; acknowledging the LLID with an extended register ACK MPCPDU (eACK) by a 10 G-ONU or by a mixed 1 G/10 G-ONU; transmitting by the OLT a standard GATE MPCPDU (GATE), containing the allocated LLID and at least one upstream transmission slot (US); and starting a data transmission in US-transmission slot from the ONU to the OLT. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification