Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Here is the error showing in my log file on an Alcatel router:

5629 2012/01/15 02:41:24.81 EST MINOR: PORT #2030 Base Port 1/2/8
"XFP/SFP DDM (supplyVoltage-high-warning) raised"

When I issue the show port command these are the details provided regarding the voltage:

Transceiver Digital Diagnostic Monitoring (DDM), Externally Calibrated
                              Value High Alarm  High Warn   Low Warn  Low Alarm
Supply Voltage (V)             3.51      3.60       3.50!      3.10      3.00 

How can this issue be resolved?

share|improve this question
It's not an error, it's a warning. There is a corresponding error, but you're not getting that error. So you don't need to resolve any error. Was anything going on at that time? Were you swapping SFPs or something? – David Schwartz Jan 17 '12 at 10:23
nothing occurred at that time it happened around 2:41 am according to the timestamp no one was working at that time – Mark S. Jan 17 '12 at 10:26
The voltage got higher than the SFP believes it should have gotten, but not higher than the SFP is designed to tolerate. There's not much you can do about it. – David Schwartz Jan 17 '12 at 10:34
up vote 0 down vote accepted

Apparently this is a sign that the optics are going bad. The voltage was causing an increased transmission level and was also causing a high optical power alarm. Replacing them fixed the issue.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.