2021-06-25 0

ONU failure to go online – Problems with OLT (1)

Now, I will start to explain all problems with connecting ONU. Before this post, I explained the most common problems – ODN (drop optical cable) and ONU. But, generally, there are 3 big possible problems: OLT, ODN, and ONU. In the next posts, I will detail explain all of these problems and how we can fix it.
First, I will show problems with OLT.
In the next table, we can see all problems with OLT:

OLT There is a problem with one or more ONU Distance between OLT and ONU is over 
default range
There is a difference between SN or password on 
the OLT and  SN or password on the ONU
ONU is deactivated
All ONUs on the same PON port has problems going online PON port is disabled
There is a problem with the slot for SFP or SFP
All ONUs on the same service board have problems going online There is a problem with the service board or slot

1. Problem with the distance between OLT and ONUs
By default, the distance between OLT and ONUs is from 0 to 20km. The system can work max 60km. But, if we want to install ONU over 20km, we have to change the distance on OLT. The difference between the minimum and maximum must be 20 km.
With the next command, we can change distance (gpon board 0/5, port 0):

TEST(config-if-gpon-0/5)#port 0 range min-distance 10 max-distance 30
This command may cause the re-registration of the ONT connected to the port.
Are you sure to execute this command? (y/n)[n]: y

After this command, we fix the problem, ONUs can connect on the OLT.
2. Problem with authentication
ONU cannot pass authentication because there is a difference between SN/password on the ONU and SN/password configured on the OLT. Because of that, ONU cannot go online.
Next, the command will show us ONU SN:

TEST(config-if-gpon-0/5)#display ont info 0 0
{ <cr>||<K> }:
Command:
display ont info 0 0
-----------------------------------------------------------------------------
F/S/P                  : 0/5/0
…
Authentic type          : SN-auth
SN                     : XXXXXX (XXXX-XXXXXX)
….

3. Problem: ONU is deactivated
The last problem is that ONU is deactivated, and because of that, it cannot go online.
To check it, we use the next command:

TEST(config-if-gpon-0/5)#display ont info 0 0
{ <cr>||<K> }:
Command:
display ont info 0 0
-----------------------------------------------------------------------------
F/S/P                  : 0/5/0
ONT-ID              : 0
Control flag       : deactivated
…
Authentic type          : SN-auth
SN                     : XXXXXX (XXXX-XXXXXX)
….

Command for activate ONU is:

TEST(config-if-gpon-0/5)#ont activate 0 0

 

Tags