Schmid Watson Installation Guide Page 47

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LTU/NTU SZ-DOC-W5-1.pd
f
Operating Manual
V
ersion: 1.5
Revision: 2002-09-10 38
Non-urgent Alarm:
At least one of the LTU – LEDs displays an amber alarm and none of the LTU – LEDs
displays a red alarm
Power failure of any one of the LTUs
Power failure of the auxiliary +5V
DC
auxiliary supply on the ACU
Power failure of one of the –48 V
DC
supplies
5.2.2 NTU
The two alarm relays “Urgent” and “Non-urgent” are located on the NTU, the alarm contacts are
available on the monitor connector.
5.2.2.1 Alarm Conditions
Urgent Alarm:
At least one of the NTU - LEDs is red
Non-urgent Alarm:
At least one of the NTU - LEDs is amber and none of the NTU - LEDs is red
Note:
In case of remote power the alarm relays are kept inactive to save power
Note:
If alarm cut off is activated (ACO = on), the alarm relays are disabled.
5.3 Alarm Display in Monitor Menus
Actual alarm status and alarm history can be displayed on a terminal or a PC with terminal
emulation connected to the Monitor interface.
The Alarm Menu display within the Fault and Maintenance Management Menu shows up the
actual alarm status of the device.
The Alarm Trace presents a note about each alarm change on the terminal.
The Alarm History, available only on LTUs, displays the alarm message and a time stamp. A
maximum of 128 alarms is stored per DSL link in the RAM of the LTU. The time stamp for an
event is calculated on basis of the internal system time.
Note:
Each power-on or system reset will restart the internal system time and will clear the event log
of the alarm history.
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