MicroNet SP3524A, User Manual

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3.3 Please check the correct Dip Switch setting.
Note: Phone cable must meet CAT 3 standard or above and without
clustering, otherwise will cause more cross talk issue to reduce
DSL power driver.
System Diagnostics
Power and Cooling Problems
If the POWER indicator does not turn on when the power cord is plugged
in, you may have a problem with the power outlet, power cord, or internal
power supply as explained in the previous section. However, if the unit
power is off after running for a while, check for loose power connections,
power losses or surges at the power outlet, and verify that the fan on back
of the unit is unobstructed and running prior to shutdown. If you still cannot
isolate the problem, then the internal power supply may be defective. In
this case, please contact your local dealer.
Installation
Verify that all system components have been properly installed. If one or
more components appear to be malfunctioning (e.g. the power cord or
network cabling), test them in an alternate environment where you are
sure that all the other components are functioning properly.
Transmission Mode
The selections of the transmission mode for the RJ-45 ports are auto-
negotiation using the default method. Therefore, if the Link signal is
disrupted (e.g. by unplugging the network cable and plugging it back in
again, or by resetting the power), the port will try to re-establish
communications with the attached device (auto-negotiation). If auto-
negotiation fails, then communications are set to half duplex by default.
Based on this type of industry-standard connection policy, if you are using
a full-duplex device that does not support auto-negotiation,
communications can be easily lost (i.e. reset to the wrong mode)
whenever the attached device is reset or experiences a power fluctuation.