
NX50 Troubleshooting Manual
Responding to alarms
Page 1-26
Issue 6.0 2019-04-01
Exgine: AM/FM Mode
Mismatched
This alarm indicates the Exporter mode does not match the
Exgine mode. Reconfigure the Exporter or Exgine to the correct
mode.
Exgine: DPLL Unlocked
This alarm occurs when the Exgine phase-locked loop can no
longer follow the reference input within 1 ppm of its calibrated
value. When using Ethernet sync, this can be triggered by
excessive jitter on the Ethernet link or a sudden change in
throughput delay of the E2X signal path (e.g., switched IP
circuits). This alarm can be temporary, in this case, once the delay
has been compensated for and a new equilibrium has been found.
This alarm can also be caused by Exgine crystal aging, which can
be resolved by recalibrating the Exgine crystal. Ensure the alarm
is not temporary and persists for at least one (1) hour. Verify the
disciplining input (Exporter clock) is correct. If Exgine crystal aging
is suspected, widen the VCXOPPM limits to 5 ppm. Restart the
system, operate for 24 hours and ensure the alarm clears.
Configure the calibrated VCXO value with the new DAC value as
reported from the Exgine status screen. Set the limits back to 0.95
ppm. Restart the system and ensure the alarm is cleared.
Exgine: Lost External
10MHz
This alarm is occurs when the Exgine's external 10 MHz signal
disappears during an active E2X connection. When this alarm is
present, the Exgine will run on the internal oscillator. This can
eventually lead to diversity delay drifts and FIFO Overflow or
Underflow conditions. If an external 10 MHz signal is being
intentionally applied to the Exgine, verify a
valid 10
MHz signal is
being applied to the Exgine. If an external 10 MHz signal is not
being applied to the Exgine, cycle (turn off, then on) ac power to
the transmitter. If the alarm persists in either condition, replace the
Exgine PWB
“Exgine PWB replacement” on page 1-72
Exgine: Network Down
This alarm indicates the Exgine has no network connectivity.
Verify the Exgine's network settings are configured properly, and
the network cable is connected to the correct port on the Exgine
PWB.
Exgine: Network
Misconfigured
This alarm indicates that invalid Exgine network parameters have
been configured. Review and correct all exgine network settings
including the IP address, netmask and gateway.
Alarm (with Prefix)
Description and Troubleshooting Action
Содержание NX50
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