Method and apparatus for automatically upgrading passive optical networks (PONs)
AssigneeBroadlight Ltd.
InventorsSimon Hochbaum, Eli Elmoalem, Doron Tal, David Ivancovsky
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Abstract
An apparatus automatically maintains bi-directional communication between an optical network unit (ONU) and a central office (CO) in a passive optical network (PON) when the CO changes from a first PON mode to a second PON mode. The apparatus senses a PON mode relating to downstream data flow from the CO to the ONU; and upon detecting a change in the PON mode from the first PON mode to the second PON mode, synchronizes the ONU to operate according to the downstream and upstream configurations of the second PON mode.
Claims27
A method for automatically maintaining bi-directional communication between an optical network unit (ONU) and a central office (CO) in a passive optical network (PON) when the CO upgrades from a first optical line terminal (OLT) having a first PON mode to a second OLT having a second PON mode, the method comprising:
- obtaining a PON mode relating to downstream data flow from the OLT to the ONU;
- and
- upon detecting a change in said PON mode from the first PON mode to the second PON mode:
- synchronizing said ONU to operate according to a downstream configuration of the second PON mode by performing:
- attempting to synchronize the ONU according to a last-known downstream configuration of the PON;
- when the ONU is unsynchronized, attempting to try to connect again with a downstream configuration used prior to the last-known setting;
- when the ONU is still unsynchronized, attempting to synchronize the ONU according to the line rates and line-codes that are pre-defined in the ONU;
- and
- synchronizing said ONU to operate according to an upstream configuration of the second PON mode.
A program storage device readable by machine, tangibly embodying a program of instructions executable by the machine to perform a method for automatically maintaining bi-directional communication between an optical network unit (ONU) and a central office (CO) in a passive optical network (PON) when the CO upgrades from a first optical line terminal (OLT) having a first PON mode to a second OLT having a second PON mode, the method comprising:
- detecting a change in PON mode relating to downstream data flow from the CO to the ONU;
- and
- synchronizing said ONU to operate according to a current downstream configuration by performing:
- attempting to synchronize the ONU according to a last-known downstream configuration of the PON;
- when the ONU is unsynchronized, attempting to try to connect again with a downstream configuration used prior to the last-known setting;
- and
- when the ONU is still unsynchronized attempting to synchronize the ONU according to the line rates and line-codes that are pre-defined in the ONU;
- and
- synchronizing said ONU to operate according and a current upstream configuration of the second PON mode.
Dependencies are inferred from the claim text.