Billion Electric Company BiGuard 50G - Manual (Page 16)

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1.3.4 Cabling
Most Ethernet networks currently use unshielded twisted pair (UTP) cabling. The
UTP cable contains eight conductors, arranged in four twisted pairs, and terminated
with an RJ45 type connector.
One of the most common causes of networking problems is bad cabling. Make sure
that all connected devices are turned on. On the front panel of BiGuard 50G, verify
that the LAN link and WAN line LEDs are lit. If they are not, check to see that you are
using the proper cabling.