VeEX MTTplus-420, Руководство пользователя

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Up REI (Remote Error Indication)
Down Request_key •
Up Encryption_key •
Down Key_switching_time • • • •
Up/Down No_message •
Down Popup • • •
Down Deactivate_ONU-ID • • •
Down Disable_serial_number • •
Up Dying_gasp •
Up/Down Physical_equipment_error (PEE) •
Up/Down PST (Protection Switch) • •
Up/Down Change_power_level • •
Down PON-ID (optional) •
Down Swift_POPUP (optional) •
Down Ranging_adjustment (optional) • •
Table : PLOAM messages listed in the table are presented in the general order they occur in the activation process. Click on message
name for more information.
C.2.1 Upstream_overhead Message: Downstream
An upstream overhead message is sent at the beginning of the G-PON activation process. The ONU
will not transmit unless it receives an upstream overhead message.
C.2.2 Extended_burst_length Message: Downstream
The ONU specifies the number of type 3 preamble bytes to use in the upstream direction during and after ONU discovery.
C.2.3 Serial_number_ONU Message: Upstream
While in Serial_Number state, the ONU transmits an unassigned message, in response to a serial number request. The ONU also
responds in the ranging state, but with an ONU-ID assigned to it.
When the OLT periodically sends a broadcast serial number request on the PON, the ONU announces its presence by sending the OLT a
Serial_number_ONU message. An ONU also sends this message in the ranging state in response to an OLT ranging request.
C.2.4 Assign_ONU-ID Message: Downstream
The OLT assigns an ONU-ID with the Assign_ONU-ID message after discovering the serial number of a newly joined ONU. Receiving an
ONU-ID moves the ONU from serial_number state to ranging state. An ONU-ID cannot be changed after the ONU leaves serial_number
state unless it is deactivated.
C.2.5 Ranging_time Message: Downstream
The OLT calculates and sets the equalization delay of the ONU, sending the equalization delay to the ONU using the Ranging_time
Message. This message is sent during initial activation and during normal operation as needed to correct for drift.
C.2.6 Request_password Message (Downstream) and Password Message (Upstream)
The OLT sends a Request_password message to an ONU to verify its identity. The ONU responds with its password message, which the
OLT compares with a table of passwords for all connected ONUs.
C.2.7 Assign_alloc-ID Message: Downstream
The Assign_alloc-ID message instructs an ONU that a specified allocation ID is assigned to it.
C.2.8 Acknowledge Message: Upstream
MTTplus-420_User_Manual_RevC00 Page 73 of 75