Measuring The Receive Optical Power Of An Onu Pon Port - Huawei SmartAX MA5603T Configuration Manual

SmartAX MA5600T/MA5603T/MA5608T Multi-service
Access Module
Commissioning and Configuration Guide
Step 5 Enable the continuous-mode ONU function. The value read on the optical power meter is the
transmit optical power of the ONU PON port. Compare the result as tested with the PON optical
module parameter in the ONU product manual.
NOTE
Step 6 After measuring the transmit optical power, disable the continuous-mode ONU function.
NOTE
Step 7 Insert the optical fiber removed in step 1 to restore the connection between the ONU and the
OLT.
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Result
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1.3.15.4 Measuring the Receive Optical Power of an ONU PON Port

Measuring the receive optical power of an ONU PON port helps to check the optical path quality.
Prerequisites
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Issue 01 (2014-04-30)
l Generally, an ONU does no transmit optical signals when it is not connected to the OLT. In this case,
enable the continuous-mode ONU function to make the ONU transmit optical signals. For how to
enable the continuous-mode ONU function, see the ONU product manual.
l If the value on the optical power meter changes within a range of 0.2 dBm, take the average value.
l If the value on the optical power meter changes in a range wider than 0.2 dBm, there is a probability
that the optical fiber is not properly connected, the optical fiber is excessively bent, or the optical fiber
connector is not clean.
l Do not bend the optical fiber. A bent optical fiber may affect the test result.
After measuring the transmit optical power, you must disable the continuous-mode ONU function.
Otherwise, other ONUs cannot go online after the ONU is connected to the OLT.
The test result in step 4 helps to determine whether the ONU is a continuous-mode ONU
or a rogue ONU.
– If no value can be read or the value is smaller than -40 dBm on the optical power meter,
there is no rogue ONU or continuous-mode ONU connected to the PON port.
– If a value can always be read and is larger than -28 dBm on the optical power meter,
there are continuous-mode ONUs connected to the PON port.
– If a value can be read at one time and cannot be read at another time and the value is
larger than -28 dBm, there are rogue ONUs (that is, ONUs that transmit data in the
timeslot that is not allocated by the OLT to them) connected to the PON port.
The test result in step 5 helps to determine whether the optical module of the PON port on
the ONU works properly.
– If the test result is between the maximum and minimum output optical power of the
ONU optical module, the optical module works properly.
– If the test result is not between the maximum and minimum output optical power of the
ONU optical module, the optical module does not work properly.
The OLT is powered on.
The OLT PON port is enabled.
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