MicroNet SP3524A, Руководство пользователя

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The best way to resolve this problem is to upgrade these devices to
version that will support auto-negotiation.
Cabling
1. Verify that the cable type is correct. Be sure RJ-45 cable connectors are
securely seated in the required ports. Use 100
Ω
straight-through cables
for all standard connections. Use Category 5 cable for 100/1000Mbps
Fast Ethernet connections, or Category 3, 4 or 5 cables for standard
10Mbps Ethernet connections. Be sure RJ21 phone wiring, use 18~26
gauge.
2. Make sure all devices are connected to the network. Equipment any have
been unintentionally disconnected from the network.
3. When cascading two devices using RJ-45 station ports at both ends of
the cable (24 ports VDSL IP DSLAM) supports auto MDIX), without
crossover cable can be used.
Physical Configuration
If problems occur after altering the network configuration, restore the
original connections, and try to track the problem down by implementing
the new changes, one step at a time. Ensure that cable distances and
other physical aspects of the installation do not exceed recommendations.
System Integrity
As a last resort verify the switch integrity with a power-on reset. Turn the
power to the switch off and then on several times. If the problem still
persists and you have completed all the preceding diagnoses, then
contact your dealer for assistance.