6.2.3. Hardware Issues

PoE (Power over Ethernet) Issues:

• Budget exceeded: Total device power needs exceed switch PoE capacity
• Standard mismatch: Device expects PoE+ (30W), switch provides PoE (15.4W)

Transceiver Issues:

• Mismatch: Different speeds, wavelengths, or fiber types
• Low light levels: Check with optical power meter
• Dirty connectors: Clean fiber end faces
• Unidirectional link: One fiber strand or an SFP's transmitter fails, so one end still receives light and the other doesn't—the two ends report different states (e.g., up/up vs. up/down). Check both strands and swap the SFP