OK indicates US or DS light is detected, but does not indicate whether ITU-T G.984 Threshold
values are met or if the OLT and ONU/ONT are properly synchronized.
LED Status
Upstream/Downstream LED Status
On screen LED colors indicate the status of upstream (
Up
) and downstream (
Dn
) signals:
Green
: Signal level detected. No errors or alarms are present. No further action required.
Red
: An error or alarm condition is detected and is currently present. Flashing red indicates a history condition—an error or alarm was
detected during the measurement interval but it is no longer present or active. Tap Advanced to view Alarms/Errors, PLOAM, and OMCI.
The
History
button resets the LEDs of past statuses.
If any LED remains red, clean the patch cord connectors that will connect the MTTplus-420 to the
ONU/ONT, the MTTplus-420 test ports (To ONU, To OLT), and the ONU/ONT ports. Refer to
Inspection
for information on inspecting and cleaning fiber connectors.
7.1 Optical Power Meter (OPM) Test Procedure
The MTTplus-420 is designed for use at the customer premises to aid with ONT/ONU activation and troubleshooting
The MTTplus-420 is connected at the customer premise
MTTplus-420_User_Manual_RevC00
Page 35 of 75
