Alloy Computer Products 16-PORT GIGABIT WEB SMART SWITCH GSS-16T2SFP - Manual (Page 63)

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5. Maintenance
5-1. Resolving No Link Condition
The possible causes for a not receiving link are:
z
The attached device is not powered on
z
The cable may not be the correct type or is faulty
z
The installed building premise cable is faulty (internal wall/ceiling cabling)
z
The port may be faulty.