netsys NV-720 Series, User Manual

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NV-720S ADSL2+/VDSL2 Wi-Fi USER’S MANUAL Ver. A.2
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System Diagnostics
Power and Cooling
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. 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 transmission mode for RJ45 ports is Giga Ethernet, for RJ-11 port is auto-negotiation VDSL2. 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 reestablish communications with the attached device via auto-negotiation. If auto-negotiation fails,
then communications are set to half duplex by default. Based on this type of commercial-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, the best way to resolve
this problem is to upgrade these devices to a version that support Ethernet and VDSL.