Method and apparatus for detecting and recovering rogue ONU
A rogue ONU detection and recovery method in a PON network includes steps of: monitoring upstream signals transmitted from a plurality of ONUs to an OLT to acquire LOS signal information and FEC error information; sensing an operation of the rogue ONU in the PON network on the basis of the LOS signal information and the FEC error information; and deactivating at least one of the plurality of ONUs and recovering the rogue ONU to a normal ONU according to whether or not the operation of the rogue ONU is released.
1 . A rogue optical network unit (ONU) detection and recovery method in a passive optical network (PON) network, the method comprising steps of:
monitoring upstream signals transmitted from a plurality of ONUs to an optical line terminal (OLT) to acquire loss-of-signal (LOS) signal information and forward error correction (FEC) error information;
sensing an operation of the rogue ONU in the PON network on the basis of the LOS signal information and the FEC error information,
wherein the step of sensing the operation of the rogue ONU includes:
determining whether or not LOS signals have been generated for all of the plurality of ONUs on the basis of the LOS signal information;
determining whether or not a number of FEC uncorrectable errors generated for the upstream signal increases on the basis of the FEC error information; and
determining that the operation of the rogue ONU has occurred in the PON network when the LOS signals are generated for all of the plurality of ONUs and the number of FEC uncorrectable errors increases; and
deactivating at least one of the plurality of ONUs and recovering the rogue ONU to a normal ONU according to whether or not the operation of the rogue ONU is released.
2 . The rogue ONU detection and recovery method of claim 1 , wherein the LOS signal information includes an LOS signal for the at least one of the plurality of ONUs detected in the upstream signal.
3 . The rogue ONU detection and recovery method of claim 1 , wherein the FEC error information is information on the number of FEC uncorrectable errors generated for the upstream signal.
4 . The rogue ONU detection and recovery method of claim 1 , wherein the step of deactivating at least one of the plurality of ONUs and recovering the rogue ONU to a normal ONU includes steps of:
deactivating any one of the plurality of ONUs (an ONU under test);
checking whether or not the operation of the rogue ONU is released on the basis of the LOS signal information and the FEC error information; and
determining the ONU under test to be a normal ONU and switching the ONU under test to an operation mode using pre-stored ONU setting information when the operation of the rogue ONU is not released.
5 . The rogue ONU detection and recovery method of claim 4 , wherein the step of deactivating at least one of the plurality of ONUs and recovering the rogue ONU to a normal ONU includes
a step of determining that the ONU under test is a rogue ONU, and performing an activation process for the ONU under test again when the operation of the rogue ONU is released.
6 . The rogue ONU detection and recovery method of claim 1 , wherein the step of deactivating at least one of the plurality of ONUs and recovering the rogue ONU to a normal ONU includes steps of:
deactivating the plurality of ONUs;
checking whether or not the operation of the rogue ONU is released on the basis of the LOS signal information and the FEC error information; and
sequentially switching the plurality of ONUs to an operation mode using the pre-stored ONU setting information when the operation of the rogue ONU is released.
7 . A computer-readable recording medium having a computer program stored therein, wherein the computer program includes instructions for causing a processor to perform the method according to claim 1 .
8 . A rogue optical network unit (ONU) detection and recovery apparatus comprising:
a memory configured to store one or more instructions; and
a processor configured to execute the one or more instructions stored in the memory;
wherein the processor executes the one or more instructions to
monitor an upstream signals transmitted from a plurality of ONUs to an optical line terminal (OLT) to acquire loss-of-signal (LOS) signal information and forward error correction (FEC) error information;
sense an operation of a rogue ONU in a passive optical network (PON) network on the basis of the LOS signal information and the FEC error information by:
determining whether or not LOS signals have been generated for all of the plurality of ONUs on the basis of the LOS signal information;
determining whether or not a number of FEC uncorrectable errors generated for the upstream signal increases on the basis of the FEC error information; and
determining that the operation of the rogue ONU has occurred in the PON network when the LOS signals are generated for all of the plurality of ONUs and the number of FEC uncorrectable errors increases; and
deactivate at least one of the plurality of ONUs and recover the rogue ONU to a normal ONU.
9 . The rogue ONU detection and recovery apparatus of claim 8 , wherein the LOS signal information includes an LOS signal for the at least one of the plurality of ONUs detected in the upstream signal.
10 . The rogue ONU detection and recovery apparatus of claim 8 , wherein the FEC error information is information on the number of FEC uncorrectable errors generated for the upstream signal.
11 . The rogue ONU detection and recovery apparatus of claim 8 , wherein the processor
deactivates any one of the plurality of ONUs (an ONU under test);
checks whether or not the operation of the rogue ONU is released on the basis of the LOS signal information and the FEC error information; and
determines the ONU under test to be a normal ONU and switching the ONU under test to an operation mode using pre-stored ONU setting information when the operation of the rogue ONU is not released.
12 . The rogue ONU detection and recovery apparatus of claim 11 , wherein the processor determines that the ONU under test is a rogue ONU and performs an activation process for the ONU under test again when the operation of the rogue ONU is released.
13 . The rogue ONU detection and recovery apparatus of claim 8 , wherein the processor
deactivates the plurality of ONUs;
checks whether or not the operation of the rogue ONU is released on the basis of the LOS signal information and the FEC error information; and
sequentially switches the plurality of ONUs to an operation mode using pre-stored ONU setting information when the operation of the rogue ONU is released.