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What does it mean on an MNL-800 if both the top green LED and the Amber LED are on continuously?

Issue

What does it mean on an MNL-800 if both the top green LED (Transmit) and the Amber LED (Receive) are on continuously?
 

Environment

MNL-800, MNL-200, MNL-100, MNL-50, MNL-V1R, MNL-V2R, MNL-V3R

Cause

LEDs indicate LON traffic on the trunk

Resolution

For an explanation of the Transmit (Green LED) and Receive (Red LED) see F-26724, MNL-800 Installation Instructions,
Table 1:

 

If the amber LED is blinking fast enough, it appears to be ON continuously, so it's receiving data at a high frequency.

The other MNL devices on the same LON should all be behaving the same way, indicating a lot of LON traffic.
Confirm with a LON protocol analyzer.

If excessive LON communications traffic is suspected, see Lessons Learned Article #3366 for a method of throttling LON traffic.

 

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Last update:
‎2018-09-10 12:27 AM
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