User guide

Preventive Maintenance and Fault-finding
For each monitored PID, the nCC provides a maximum acceptable period between
consecutive transport stream packets. If a PID does not arrive within the maximum
acceptable period then an alarm (warning) is raised to nCC. Any alarm raised to
nCC indicates the PID, transport stream and physical port.
If a missing PID alarm is raised, it remains active for a minimum of 2 seconds to
prevent alarm bounce.
5.8 Access to Fault-finding Information
Fault-finding information is gathered by nCompass Control via the Control Ethernet
ports.
The RS-232 Engineering port is used to set the IP Address of the MX8400. This is
described in Chapter 3.
5.9 AC Supply Problems/Indicator Unlit
5.9.1 Symptoms
Warning!
Do not attempt to service the Power Supply Unit as opening or removing covers
may expose dangerous voltages or other hazards. Refer all servicing to service
personnel who have been authorized by Ericsson.
Use the following techniques to fault-find the Multiplexer according to the observed
symptom(s) when an AC supply failure is suspected.
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