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NetLink NL-8 Industrial Switch
8-port managed Ethernet switch · DIN-rail · PoE+
The NL-8 is an eight-port managed switch for control networks, with PoE+ on four ports and redundant 24 V inputs. This guide walks the common faults (no link, no PoE, slow traffic and loss of management) to a remedy.
Notice
Work live with careThe switch is usually diagnosed powered. Treat the 24 V inputs and PoE ports as live, and isolate before re-terminating any cable.
First checks
- Confirm the power LEDs: the switch needs at least one healthy 24 V input.
- Check the port LED: dark means physical layer, amber means link-only.
- Swap the suspect patch lead for a known-good one and re-test.
- Move the device to a spare port to rule the port in or out.
- Console in over the mini-USB and check the port, VLAN and PoE status.
Symptom → cause → remedy
Troubleshooting
| Symptom | Likely cause | Remedy |
|---|---|---|
| Port LED dark, no link | Cable, SFP or far-end port | Swap the patch lead; test the run; try another port |
| Link up but no traffic | VLAN or speed mismatch | Check the port VLAN and force-match the speed/duplex |
| PoE device won't power | Budget exceeded or class | Check the 120 W budget; confirm the device is 802.3at |
| Intermittent drops | Marginal cable or EMI | Re-terminate; separate from VSD cabling; check earthing |
| No web / SNMP access | Wrong IP or blocked VLAN | Console in; confirm the mgmt VLAN and IP; reset if needed |
| Both power LEDs off | Supply or fuse | Check both 24 V inputs and the inline fuse |
Where to start
Both power LEDs offCheck 24 V inputs and the inline fuse
Port LED darkSwap the lead, then try another port
Link up but no trafficCheck VLAN and speed/duplex
No management accessConsole in; confirm mgmt VLAN and IP