PLANET VC-100M - Manual (Page 25)

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5. Troubleshooting
SYMPTOM: VDSL link LED not lit after wire is connected
to the VDSL port.
CHECKPOINT:
1: Verify the length of the wire connected between
VC-101M and VC-101S is not more than 1.5km.
2: Please note you must use 1 VC-101M and 1 VC-101S
connect to each other to make it work.
SYMPTOM: Switch Link/Act LED not lit after cable is
connected to the port.
CHECKPOINT:
1: Verify use the RJ-45 cable connected to the port.
2: If your device (like LAN card) support to
Auto-Negotiation, please try to manual set at a fixed
speed of your device to solve this problem.