GPON Status
The GPON Status Screen
Click System Monitor > GPON Status to open the screen to see the real-time DDMI (Digital Diagnostics Monitoring Interface) parameters.
The PON transceiver’s support for the DDMI function lets you monitor the PON transceiver’s parameters to perform component monitoring, fault isolation, and failure prediction tasks. This allows proactive, preventative network maintenance to help ensure service continuity.
System Monitor > GPON Status
The following table describes the labels in this screen.
System Monitor > GPON Status 
LABEL
Description
GPON Information
SFP presence
This displays SFP inserted when a fiber optic cable is connected to the PON port and a power signal is detected. Otherwise, SFP not inserted is displayed.
RX power signal
This displays the PON transceiver’s receiving power in dBm. The normal range is –9 to –28 dBm.
TX power signal
This displays the PON transceiver’s transmitting power in dBm. The normal range is 4 to 9 dBm.
Temperature
This displays the PON transceiver’s temperature in degrees Celsius. The normal range is 0 to 85 degrees Celsius.
SFP vendor
This displays the vendor name of the PON transceiver.
SFP model
This displays the model number of the PON transceiver.
SFP serial
This displays the serial number of the PON transceiver.
*Make sure the fiber optic cable is well connected to the PON port.
*If the TX and RX power signals of the DDMI are out of range, inspect the fiber optic cable for dirt or damage. If the fiber optic cable is clean and undamaged, use a power meter to measure whether the actual RX power signal of the Zyxel Device falls within the range of –28.0 to –9 dBm.