User Manual

6 Troubleshooting
64
Remote Troubleshooting Via the NMS
There are several parameters that are measured by either the WMTS or the MMU.
These parameters are polled periodically by the NMS, and kept in a database for
statistics. A threshold can be set for some of these parameters. When such a threshold
is crossed, the NMS issues an alarm event. The following is a list of these parameters,
and their functionality.
NMS Monitored Parameters
Channel Statistic Parameters at the Monitoring Modem
 Downstream Received Power – Checks all the downstream TX path (WMTS
downstream card output, Upconverter, PA, Diplexer, Directional power, and cables),
and the monitoring path (splitter, combiner, attenuators) to the MMU.
Monitoring the downstream received power enables long term tracking of this path.
 Downstream SNR – Checks the TX signal quality, from the WMTS downstream
card output, through the Upconverter and PA.
Monitoring the Downstream SNR enables long term tracking of signal quality.
 Upstream Output Power – Checks the receiver path, from the MMU through the
monitoring path (splitter, combiner, attenuators) and the entire upstream receiver
path (LNA module, Downconverter, to the WMTS Hex card RX port).
Tracing the output level enables validating the stability of the US path.
Channel Statistic Parameters at the Channel
 Upstream Received SNR – Checks the entire upstream receiver signal path. It
enables validation of US signal quality and proper operation. This test can also be
used as an indication for external interference.