Milan Technology MIL-SM2401M Manuale Utente

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6. 
Troubleshooting 
 
 
This section is intended to help you solve some common problems 
encountered while using the MIL-SM2401M switch series. 
 
Incorrect connections                           
 
The switch auto-detects the polarity and direction of the UTP cable 
attached. If no link I seen, then check the following: 
 
 
Faulty or loose cables 
Look for loose or obviously faulty connections. If they appear to be 
OK, make sure the connections are snug. If that does not correct 
the problem, try different cables. 
 
 
Non-standard cables 
Non-standard and miswired cables may cause numerous network 
collisions and other network problems.  This can seriously impair 
network performance. A category 5 cable tester is a recommended 
tool for every network installation. 
 
 
Improper Network Topologies 
It is important to make sure that you have a valid network topology. 
Common topology faults include excessive cable length and too 
many repeaters or hubs between end nodes. In addition, you should 
make sure that your network topology contains no data path loops. 
Between any two ends nodes,
 
there should be only one active 
cabling path at any time. Data path loops will cause broadcast 
storms that will severely impact your network performance.