Cisco: fan speed high and will not return to normal limits
Summary: Cisco: fan speed high and will not return to normal limits
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Symptoms
replace the original sfp with Cisco "compatible" long wave GBIC.
Fan speed on 9148S goes high after 30 minutes, and will not return to normal.
The cause of a fan speed issue is seen as:
1) High system temperature (could be blockage but not necessarily so)
2) Any SFP temp alarm
3) Any system fan failure
There was no observed blockage or impediment.
There were no sfp alarm, nor a system fan failure.
Fan speed on 9148S goes high after 30 minutes, and will not return to normal.
The cause of a fan speed issue is seen as:
1) High system temperature (could be blockage but not necessarily so)
2) Any SFP temp alarm
3) Any system fan failure
There was no observed blockage or impediment.
There were no sfp alarm, nor a system fan failure.
Cause
Customer replaced sfp with long wave GBIC (Cisco compatible).
This sfp was not able to be properly read by the switch, and caused the fan speed issue.
This sfp was not able to be properly read by the switch, and caused the fan speed issue.
Resolution
use Cisco part. Upon replacing or removing sfp, speed returned to normal limits within 30 mins.
Affected Products
Connectrix MDS-9148SProducts
Connectrix MDS-9148SArticle Properties
Article Number: 000064622
Article Type: Solution
Last Modified: 13 Mar 2025
Version: 4
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