ZyXEL Communications OLT2406, User Manual

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Chapter 109 Troubleshooting
OLT2406 User’s Guide
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Check if the transmitting data rates are normal on the OLT uplink ports, GPON ports, the connected
ONT/ONU ports, and the ONT/ONU user ports. From the output traffic statistics, you can see if the traffic
amounts are normal. If too many packets were dropped related to a certain GPON port and the ONT/
ONU is functioning normally, check the settings on the port. If there were too many broadcast and
multicast packets, check the VLAN settings for transmitting the upstream and downstream services and
make sure QinQ is enabled.
Use the
show mac address all
command to check the MAC table on the OLT to see if the MAC
addresses of the ONTs/ONUs and the uplink gateway device were learned on the corresponding ports.
109.1 Rogue ONT Troubleshooting
The OLT controls and arranges different time slots for each ONT/ONU in the same fiber network for
transmitting upstream traffic. A rogue ONT/ONU means the ONT transmits traffic during a time allocated
to another ONT/ONU. One rogue ONT/ONU may cause the rest of the ONTs/ONUs connected to the
same PON port to fail to transmit traffic. You can use the
test interface olt rogue pon-< slot >-
< port >
command to discover rogue ONTs, especially when you receive reports from multiple ONTs/
ONUs not being able to transmit traffic. This example performs a rogue ONT discovery up to 1000
milliseconds (around 16.67 seconds). The OLT adds two normal ONTs/ONUs back with serial numbers
414C434C25004992 and 5A59584500000011. They were disconnected due to a rogue ONT. The OLT