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US 8,711,685 B2Granted
System and method for data reconfiguration in an optical communication network
AssigneeAlphion Corporation
InventorsGanesh Lakshminaravana, Jayanta Das
Life of this patent
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Abstract
A system and method for optical communication are disclosed that may include providing an optical network terminal (ONT) operable to transmit information over a passive optical network (PON) to an optical line terminal (OLT); transmitting gigabit encapsulation mode (GEM) frames from the ONT to the OLT; converting the GEM frames into IP fragments; and transmitting the IP fragments out of the OLT.
Claims3
A method for converting GEM frames into valid IP packets at an Optical Line Terminal (OLT), the method comprising:
- receiving a GEM frame including a data fragment at the OLT;
- if the received GEM:
- frame is a first frame of an IP packet, recovering the Ethernet and IP headers of the frame;
- storing the recovered header information in a data table in a memory in a data reconfiguration engine at the OLT;
- adjusting the IP header information to indicate that the IP packet is fragmented using the data reconfiguration engine;
- modifying an indication of a length of the IP packet in the IP header to match a length of the data fragment in the received GEM frame;
- recomputing an Ethernet cyclic redundancy check (CRC) using a CRC engine within the data reconfiguration engine;
- and
- sending the IP packet into the core network.
6 more elements
A method for converting GEM frames into valid IP packets, the method comprising:
- if a GEM frame is not the first frame of an IP packet, looking up the Ethernet and IP headers under the ID of the GEM frame in a data table in a memory within a data reconfiguration engine;
- setting a length of an Ethernet packet of the GEM frame to the length of an Ethernet fragment embedded in the GEM frame;
- setting a length of an IP packet to the length of an IP fragment embedded in the GEM frame;
- and
- setting an IP fragment offset according to the value of a current_Fragment_Offset entry in the data table.
2 more elements
Dependencies are inferred from the claim text.