Encontré esta información, muy util, la dejaré acá... por motivos obvios, in english:
Initial State (O1):
When the ONU is powered on, it enters the
O1 (Initial) state. In this state, the ONU is in a
LOS (Loss of Signal) or
LOF (Loss of Frame) condition and waits for valid downstream optical signals from the OLT.
Standby State (O2):
When the ONU detects valid downstream traffic from the OLT, it transitions to the
O2 (Standby) state.
Upon receiving an
Upstream_Overhead message, the ONU configures several operational parameters, including:
- Delimiter value
- Power-level mode
- Pre-assigned equalization delay
Serial Number State (O3):
After entering the
O3 (Serial Number) state, the OLT sends a
Serial_Number Request message to the ONU. The ONU responds with its
Serial Number (SN) and password. If authentication is successful, the OLT assigns an ONU identifier by sending an
Assign_ONU-ID message. Once the ONU receives its assigned
ONU-ID, it transitions to the
O4 state.
Ranging State (O4):
The
O4 (Ranging) state is the logical ranging phase, during which timing and synchronization parameters are established between the ONU and the OLT. After the ONU receives the ranging response from the OLT, it transitions to the
O5 (Operation) state.
Operation State (O5):
In the
O5 (Operation) state, the ONU is fully operational and can transmit upstream user traffic as well as
PLOAM messages.
POPUP State (O6):
If the ONU detects a loss of optical signal while in operation, it enters the
O6 (POPUP) state. The ONU then transitions back to the
O1 (Initial) state to restart the registration process.
Emergency Stop State (O7):
When the ONU receives a
Disable_Serial_Number message from the OLT, it enters the
O7 (Emergency Stop) state. Afterward, the ONU transitions to the
O2 (Standby) state and awaits further instructions from the OLT.