User Manual

MDR2400 and MDR5800 User Manual
862-01881 Issue 8 Page 53
6.5.2.3 General Status Indicators
These errors occur during the phase of continuous error checking. Errors are
latched until the operator clears them on the NMS.
The following is a list of possible error indicators as well as the possible faults and
corrective actions to solve each error.
Error Displayed Possible Faults and Corrective Actions
General Faults
Outdoor Unit Not
Responding
• The Outdoor Unit simply doesn't respond to any messages sent to it
by the Indoor Unit. The Outdoor Unit could possibly be damaged or
the cables to the Outdoor Unit are disconnected from the Indoor
Unit or damaged.
Outdoor Unit
Comms Error
• Message from Outdoor Unit too long (data corruption).
• Received message frame invalid – the Outdoor Unit messages
follow a strict data link layer frame protocol. There could data
corruption.
• Partial message received from Outdoor Unit - remainder did not
arrive in time (Outdoor Unit switched off?).
• CRC Error – data corruption.
• Software queuing/buffering errors in the Indoor Unit firmware.
Wayside Port
Comms Error
• Wayside port queue overruns - too high data rates or failed
overhead link.
• Comms Error - errors caused by Rx Overrun (Indoor Unit processor
could not service the received characters fast : too high data rates),
parity error if odd or even parity enabled (data corruption or
incorrect configuration), framing error (no valid stop bit where one
was expected - invalid baud rate or data width or parity
configuration or data corruption) or break detected (line shorted
causing permanent break or corruption).
Overhead Link
Comms Error
• Overhead PPP link error: the buffering system of the overhead link
cannot process data fast enough and received messages have
been discarded (the software cannot process the data fast enough).
Ethernet Comms
Error
• The buffering system of the interface cannot process data fast
enough and received messages have been discarded (the software
cannot handle the data fast enough).
Element Manager
Comms Error
• Message from PC or laptop too long (data corruption).
• Software queuing/buffering errors in the NMS firmware.
Alarm 1 on A digital optically isolated input used for general site alarm monitoring
(Auxiliary Input 1).
Alarm 2 on A digital optically isolated input used for general site alarm monitoring
(Auxiliary Input 2).
6.5.2.3.1 Power-up Self Test Indicators