Hello, everyone!
Today, I will share knowledge about problems with frequent internet disconnections and how we can fix it. This is the second and last article about this theme.
In the next table, we can see all problems with frequent internet disconnections. The problem can be the user`s device (router, switch, PC, etc), ONT, OLT, and upper-layer device (BRAS, aggregation switch, router).
In the first article I explained problems with user`s devices and ONT, today I will explain problems with OLT and upper-layer devices.
User's devices | Problems with PC |
Problems with user`s network devices | |
ONT | Problems with the hardware |
Problems with wireless network | |
OLT | Problems with the hardware |
Problems with packet loss | |
Upper-layer device | Problems with discard user packets |
Problems with hardware of the OLT
Very rarely, OLT can have hardware problems. If the problem is with all ONTs on one PON port, the problem can be SFP or slot for SFP. If there are problems with a large number of ONTs on all PON ports of one GPON board. The problem can be on the GPON board or slot for the GPON board. And the end, if there are problems with all ONTs on one OLT, the problem may be the OLT chassis or power supply.
In these cases, we have to change SFP, slot, GPON board, chassis, or power supply. After that, we will fix the problems.
Problems with packet loss
If the hardware of OLT is ok, but we have problems with all ONTs on the same OLT, the problem may be in the configuration on the OLT. Packets are lost on OLT. The cause is the incorrect configuration on OLT – configuration for aggregation of links between OLT and US port of control board and the configuration for port negotiation.
There is another situation when packets are lost on the OLT. The reason is the large amount of traffic on the US port control board.
We have the same problem when there is a loop on the network that leads to MAC address flapping.
We can fix this problem when we change the configuration.
Figure 1. OLT MA5800-X17
(https://carrier.huawei.com/en/products/fixed-network/access/olt/smart-ng-olt-ma5800)
Problems with discard users packets
If problems with frequent internet disconnections occur on all ONTs on several different OLTs, the problem is in the upper-layer device. These include BRAS, aggregation switch or router, and utp or optical cables.
Some upper-layer device discards packets. We need to check the configurations and connections between the devices.
Thank you!
Reference:
HCIP-Access V2.5 Training Material
https://carrier.huawei.com/en/products/fixed-network/access/olt/smart-ng-olt-ma5800
