Billion Electric Company BiGuard 30 사용자 설명서

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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 30, 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.