Hi, everybody!
Today, I will continue to explain problems with OLT. In the previous post, I explained the problem with OLT, when there are problems with one or more ONU. In this post, I will explain other problems.
In the next table, we can see all problems with OLT:
OLT |
There are problems with one or more ONU |
Distance between OLT and ONU is over the 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: PON port is disabled
First, we can check the status port:
TEST(config-if-gpon-0/1)#display this
{ <cr>|include-default<K>||<K> }:
Command:
display this
[gpon]
<gpon-0/1>
interface gpon 0/1
shutdown 0
port 0 ont-auto-find enable
port 0 fec enable
port dba bandwidth-assignment-mode 0 max-bandwidth-usage
…
Or we can use the next command:
TEST(config-if-gpon-0/1)#display port info 0
{ <cr>||<K> }:
Command:
display port info 0
-----------------------------------------------------------
F/S/P 0/1/0
Min distance(km) 0
Max distance(km) 20
Max guaranteed bandwidth(kbps) -
Left guaranteed bandwidth(kbps) 1235712
Number of T-CONTs 0
Autofind Enable
FEC check Enable
Admin State Off
ONT encryption key switching interval(m) Disable
PON-ID switch Disable
PON-ID identifier 0
Jumbo frame switch Disable
Port MTU(bytes) 2052
Surplus bandwidth assignment Disable
Best-effort bandwidth assignment -
Traffic alarm-profile ID -
ONT online power threshold(dBm) -
Low-latency no
-----------------------------------------------------------
Port is disabled and there isn`t optical power 1490nm.
With next command we can activate port:
TEST(config-if-gpon-0/1)#undo shutdown 0
And after activating the port, we will check, again:
TEST(config-if-gpon-0/1)#display this
{ <cr>|include-default<K>||<K> }:
Command:
display this
[gpon]
<gpon-0/1>
interface gpon 0/1
port 0 ont-auto-find enable
port 0 fec enable
port dba bandwidth-assignment-mode 0 max-bandwidth-usage
…
Or we can use the next command:
TEST(config-if-gpon-0/1)#display port info 0
{ <cr>||<K> }:
Command:
display port info 0
-----------------------------------------------------------
F/S/P 0/1/0
Min distance(km) 0
Max distance(km) 20
Max guaranteed bandwidth(kbps) -
Left guaranteed bandwidth(kbps) 1235712
Number of T-CONTs 0
Autofind Enable
FEC check Enable
Admin State On
ONT encryption key switching interval(m) Disable
PON-ID switch Disable
PON-ID identifier 0
Jumbo frame switch Disable
Port MTU(bytes) 2052
Surplus bandwidth assignment Disable
Best-effort bandwidth assignment -
Traffic alarm-profile ID -
ONT online power threshold(dBm) -
Low-latency no
-----------------------------------------------------------
2. Problem: there is a problem with the slot for SFP or SFP
If there is a problem with the slot for SFP or SFP, ONU cannot connect to OLT.
Easy method for check slot SFP, we can use another slot on service boards. After that, if ONU can connect to OLT, we fix the problem.
If problem is SFP, first, we have to change SFP. And then, check it.
3. Problem: there is a problem with a slot for service board or service board
If we have problem with all ONUs on the same service board, the problem is service board or slot.
We can use other slot or service boards. And fix the problem.
Thank you!
Reference:
Training material for HCIP-Access
For more information, please click:
ONU failure to go online – Problems with OLT (1)
ONU failure to go online – Problems with ODN (3)
ONU failure to go online – Problems with ODN (4)
ONU failure to go online – Problems with ODN (5)
ONU failure to go online – Problems with ODN (6)
ONU failure to go online – Problems with ODN (7)
ONU failure to go online – Problems with ONU (8)
