In this tutorial, we’ll explain how to delete an Offline ONU from an ECOM OLT . Sometimes ONU devices remain registered but inactive due to hardware changes or disconnection. To keep your OLT clean and efficient, you should remove such ONU entries using proper CLI commands.
Step 1: Login to ECOM OLT
Use SSH or console to access the OLT:
ssh admin@192.168.1.1
Default username: root, password: admin (if not changed).
User Access Verification
****************************************************************
** EPON OLT Integrated Operating System.
** Device Model : E04EP-4S+
** Hardware version : V1.1
** Firmware version : V3.4.27_250728
** BuildDate : Mon, 28 Jul 2025 16:34:26 +0800
** Mac Address : E0:67:B3:7B:62:C3
****************************************************************
User name:root
Password: *****
KALAM-OLT> ena
KALAM-OLT#
Step 2: Check ONU Status
Run the following command to see all offline ONU devices:
PON-1 KALAM-OLT# config
KALAM-OLT(config)# interface epon 0/1
KALAM-OLT(config-epon-0/1)# show ont offline-list 1 all
PON-2 KALAM-OLT# config
KALAM-OLT(config)# interface epon 0/1
KALAM-OLT(config-epon-0/1)# show ont offline-list 2 all
PON-3 KALAM-OLT# config
KALAM-OLT(config)# interface epon 0/1
KALAM-OLT(config-epon-0/1)# show ont offline-list 3 all
PON-4 KALAM-OLT# config
KALAM-OLT(config)# interface epon 0/1
KALAM-OLT(config-epon-0/1)# show ont offline-list 4 all
By using the above commands, you will be able to see how many offline ONUs are connected to each of your ports.
In an ECOM OLT, interface epon 0/1 is considered as a slot. Inside this slot, 4 EPON ports are assigned.
This configuration is only applicable for a 4-port EPON OLT.
If it is an 8-port OLT, then inside interface epon 0/0 there will be 4 EPON ports, and inside interface epon 0/1 there will be another 4 EPON ports assigned.
Step 3: Identify Offline ONU
Find ONU that is Offline. Example output:
KALAM-OLT(config-epon-0/1)# show ont offline-list 2 all
-----------------------------------------------------------------------------
F/S P ONT MAC Control Run Config Match Desc
ID flag state state state
----------------------------------------------------------------------------
There is no offline ont.
KALAM-OLT(config-epon-0/1)# show ont offline-list 3 all
-----------------------------------------------------------------------------
F/S P ONT MAC Control Run Config Match Desc
ID flag state state state
----------------------------------------------------------------------------
There is no offline ont.
KALAM-OLT(config-epon-0/1)# show ont offline-list 4 all
-----------------------------------------------------------------------------
F/S P ONT MAC Control Run Config Match Desc
ID flag state state state
----------------------------------------------------------------------------
0/1 4 28 C07E40DBA21D Active Offline initial initial
-----------------------------------------------------------------------------
Total: 1, offline
KALAM-OLT(config-epon-0/1)#
Here, I have checked the offline list for a total of 4 EPON ports. I found one offline ONU on port number 4. There may be offline ONUs on all of your ports. Please make sure to delete them.
Step 4: Delete the Offline ONU
Use the following command to delete:
KALAM-OLT(config-epon-0/1)# ont delete 1 offline-list all
Total offline ONT(s):0 delete.
KALAM-OLT(config-epon-0/1)# ont delete 2 offline-list all
Total offline ONT(s):0 delete.
KALAM-OLT(config-epon-0/1)# ont delete 3 offline-list all
Total offline ONT(s):0 delete.
KALAM-OLT(config-epon-0/1)# ont delete 4 offline-list all
Total offline ONT(s):1 delete.
KALAM-OLT(config-epon-0/1)#
This will remove ONU ID 28 from port EPON 4.
Step 5: Verify Deletion
Run again:
KALAM-OLT(config-epon-0/1)# show ont offline-list 4 all
-----------------------------------------------------------------------------
F/S P ONT MAC Control Run Config Match Desc
ID flag state state state
----------------------------------------------------------------------------
There is no offline ont.
Confirm that the offline ONU entry is no longer in the list.
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Conclusion
By following this step-by-step guide, you can safely remove any Offline ONU from your ECOM OLT. Regularly cleaning up unused ONU entries helps keep your network stable and reduces confusion while managing ONU devices.