alarm indicator: A device that responds to a signal from an alarm sensor. Note: Examples of alarm indicators include bells, lamps, horns, gongs, and buzzers.
An alarm required by SOLAS regulation 11-1/15.9.
5. Approach to critical point: An alarm will be given by the ECDIS when the ship reaches a specified time or distance, set by the mariner, in advance of a critical point on the planned route. Recommended Settings: To be set at time greater than PFI for particular leg of the passage plan.
The five mandatory alarms (as per IMO ECDIS Performance standards) are: crossing safety contour, deviation from route, positioning system failure, approach to critical point and different geodetic datum.
Short for loss of frame, LOF is an indication on network devices or software that indicates that one or more network frames were not received by the networking device. If an LOF is encountered, it is likely the network router, bridge, or other network device is not correctly configured or is over subscribed.
Appropriate safety settings are of paramount importance for ECDIS display. These settings control how the ECDIS presents depth information, making it easier to visualize areas of water that are safe for the vessel to navigate in from those which are not.
Description: A loss of signal (LOS) or loss of frame (LOF) alarm indicates that a signal could not be detected at the T1 interface.
An LOS defect is cleared if there are signal transitions within 125 µs. When dealing with other layers, the loss of continuity is discovered using a maintenance signal known as the Alarm Indication Signal (AIS). AIS indicates that there is a failure further upstream in the lower layer signal.
AIS = Alarm Indication Signal. The T1 will send AIS (also known as a Blue alarm) when there is a disruption in the upstream transport path. This signal is all 1's in the payload *AND* framing bits.
Red alarm indicates the alarming equipment is unable to recover the framing reliably. Corruption or loss of the signal will produce "red alarm". Connectivity has been lost toward the alarming equipment.
Ensure the cable between the interface port and the T1 Service Provider equipment or T1 terminal equipment is connected correctly. Ensure the cable is hooked up to the correct ports. Correct the cable connections if necessary. Check the cable integrity by looking for breaks or other physical abnormalities in the cable.
The E1 controller can be in three states: Administratively down. Down. Up.
Complete these steps to restart the controller to correct this error:
- Enter enable mode.
- Enter global configuration mode.
- Enter controller configuration mode.
- Restart the controller.
