DM16E1 / DM4E1 Operation and Installation Manual - 204-4001-19 35
o Generating Ring Backup: Indicates that the device is inserting data in the protection ring
(BACKUP ring). This status is used when the equipment detects that a device is working
without the main link (MAIN) and is in the "Using Ring Backup" status, as previously
described.
o Forwarding Ring Data: Indicates that, due to some failure not directly related to the
device, data are being passed through using the protection ring (BACKUP ring).
• Aggregate Link Error Ratio: The mean error ratio observed in the optic link that is being used in
the equipment.
− Link OK: The link is operating in normal conditions.
− Higher than 10e-6: Error ratio higher than 1.10-6.
− Higher than 10e-3: Error ratio higher than 1.10-3. This provokes the locking of the backup link,
whenever there is one.
− FrameLoss: Link failure indicating that the quality parameter is not applicable.
• Current Alarms: Indicates the highest-priority active alarm. It is the result of the logic established
between external alarms, active interface alarms and enabled alarms. This status follows the alarm
instantaneous condition.
• Latched Alarms: Similar to Current Alarms. It maintains the worst alarm condition until the user
sends a recognition command (Reset Latched Alarms, "A" key). The Alarm led on the panel is turned on
whenever some alarm (Latched Alarms) is active. The values for the Current/Latched alarms field are:
− No alarms: No active alarm. Normal condition.
− Low priority alarm: Low-priority alarm active.
− High priority alarm: High-priority alarm active.
• Alarm Output: Alarm output status made available in the DB9 connector, located on the rear
panel. The alarm output follows the latched alarm status. It has three status possibilities:
− No alarm: No active alarm.
− Acknowledged alarm: There is an active alarm that was recognized by the user. The recognition
command is given through the K key in the same menu. The device returns to the No alarm
condition after a reset request in latched alarms, provided there are no other alarms. The alarm
output is deactivated.
− ALARM: There is an active alarm that was not recognized. The device stays in this condition until
it is recognized (using the K key on this screen) or until the latched is extinguished (end of alarm
condition followed by a “reset latched alarms” using the A key on this screen).
• Current Tests: Indicates if there is any active test running in the device interfaces. Values:
− No active tests: No active tests in the interfaces.
− Test Activated: Test activated in some of the device interfaces.
• Main and Backup Power Supply Units: Indicates the status of the MAIN and BACKUP units. The
status of these fields is shown in the PSU (MAIN and BACKUP) leds on the panel. The possible values
are:
− Not Present: No unit was inserted in this slot. The panel led remains off.
− OK: There is a unit inserted in the slot and it is operating correctly. The panel led remains on.
− Malfunction: There is a unit inserted, and it is not working properly. The problem could be internal
to the unit or in the device power unit (tension out of specification). The panel led keeps flashing.
• 2048kHz E1 AIS Reference: It shows which clock option is being used as a reference for the
transmission of AIS alarm signal to the tributaries. This reference can also be used by tributary V.35
present in the device.
− Internal: Using internal reference.
− External: Using external reference.
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