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FAQ

OttoE PoE Watchdog Troubleshooting Guide

Watchdog Not Triggering

Check: Are DIP #1–#8 enabled? Is DIP #9 (startup delay) still counting down? Has the switch been rebooted

Fix: Reproduce after the delay ends.


Frequent Reboots (False Positives)

Cause: Ultra-low-traffic or power-only PDs can be misidentified as “inactive.”

Fix: Disable Watchdog on that port.


PD Doesn’t Come Back Online After Reboot

Check: Is the PoE budget sufficient (inrush when multiple high-power PDs power up)? Are cabling/termination quality and run length within spec?

Fix: Swap the Ethernet cable, port, or PSE (e.g., PoE injector/switch) to cross-test. Stagger the power-up if necessary.


Compatibility Note: PoE Splitters / Non-Standard PDs

Use devices compliant with IEEE 802.3af/at/bt whenever possible. Passive PoE or non-standard PDs may behave unpredictably; consider disabling Watchdog on that port.


Quick Checklist

  • DIP #1–#8 mapping is correct; #9 delay matches the PD’s boot time.
  • The switch has been rebooted after changes.
  • PoE budget is adequate; cabling follows spec (Cat5e or better, ≤ 100 m).
  • Low-traffic devices have Watchdog disabled.

Updated: 2025-08-21 | Applicable models: OttoE PoE series

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