Activated ONT/ONU List

Activated ONT/ONU lists all of the PON and XG(S)-PON ONTs that have been detected by the OLT since the measurement was started/restarted from the OPM summary screen.

To see the list of ONTs, swipe left to the Activated ONT screen.

 

 White: Registered ONT

Yellow: Operational ONT

 Red: Unregistered ONT

 Green: Most recently registered ONT

 Grey: Rogue ONT

 

 

When an ONT is registered, it means it has successfully completed the activation process with the OLT and is now officially part of the PON network. During registration, the ONT sends its serial number (and sometimes a password) to the OLT, which then authenticates it, assigns an ONU/ONT ID, and provisions its bandwidth and service parameters. Once this process is complete and the ONT reaches the operational state, it is allowed to send and receive live user traffic. In simple terms, a registered ONT is one that the OLT knows, trusts, and has fully set up to carry service.

 

Before the process is completed and the ONT is fully active and carrying live service, the ONT may be in an operational state. An ONT in operational state means that it is logically added to the PON and "known" to the network, but not necessarily fully up and passing traffic yet. When you first insert the ONT, you might see a brief flash of yellow before it becomes green indicating full registration. In this sense, the yellow is the brief communication or "handshake" between the ONT and the OLT. The ONT is sending information to the OLT and asking for permission to join the network while the OLT decides if the ONT is qualified. If it stays yellow, it means that the ONT is acknowledged, but there is an issue and it could not fully register.

An unregistered ONT is an ONT that the OLT has not yet accepted or provisioned into the PON network. This can happen when the ONT is newly connected, unknown to the OLT, has the wrong serial number or password, fails authentication, or doesn’t match the expected provisioning profile. It can often be seen as an Unknown or Alien device. In this state, the ONT may send its serial number upstream, but the OLT has not assigned it an ONU/ONT ID and does not allow it to carry user traffic. In short, an unregistered ONT is visible but not authorized or configured to operate on the network.

Examples :

  • If a technician were to connect an EPON ONT or an XGS-PON ONU with a GPON OLT.

  • If the ONT SN was never registered to the PON-ID.

In these types of situations, the OLT will send a message that it does not recognize this ONT SN and will request the ONT to disable the SN and deactivate itself.

A Rogue ONT is when a registered ONT transmits outside of the OLT allocated transmission time slot either intermittently or continuously. This can happen when an ONT is defective or overheated. This causes the ONT transmission to collide with other registered ONTs transmission on the same PON-ID who are keeping within their time slot, resulting in transmission errors. In many cases, a rogue ONT does not have service issues, but other ONTs on the same PON-ID may report service issues.

See Rogue ONTs for more information.