Redundancy Concept - JRC JAN-7202 Instruction Manual
Bridge alert management system
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Also See for JAN-7202:
- Installation manual (100 pages) ,
- Instruction manual (332 pages) ,
- Field service manual (1078 pages)
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3.4
Redundancy Concept
The concept of backup and redundancy is as follows.
1) Two units featuring CAM are installed in the system. One unit displays the alert management
screen in the normal state and functions as the alert management server (hereinafter referred to as
the CAM (Main)). The other unit executes other tasks (such as ECDIS) in the normal state and
takes over the alert management server if a failure occurs in the CAM (Main) (hereinafter referred to
as the CAM (Backup)).
2) Once the CAM (Backup) is activated, it starts collecting alert information from each unit (RADAR,
ECDIS, various types of sensors and so on).
3) All the units without the CAM feature send alert information to the CAM unit and also display alerts
individually. Thus, even if there is no active CAM unit in the system, each of other units can display
alert information.
Alert display, buzzer emission, and approval
•
Alerts of MFD and sensors are displayed synchronously with both CAM (Main) and CAM
(Backup).
•
Alert buzzer sound is emitted from both CAM (Main) and CAM (Backup) at the occurrence of an
alert.
•
Alerts can be approved by both CAM (Main) and CAM (Backup).
Switching between CAM (Main) and CAM (Backup)
•
Normally, CAM (Main) mainly collects and distributes alerts to the system.
•
When CAM (Main) stops, control is switched to CAM (Backup) and CAM (Backup) takes over the
processing.
•
When CAM (Backup) stops, control is switched to CAM (Main) and CAM (Main) takes over the
processing.
CAM(Client)
•
CAM(Client) is function that display the alert management screen of CAM in equipment other than
CAM.
•
CAM(Client) is displayed the same screen as the alert management screen and alerts in bridge.
CAM(Client) emits buzzer sound, silences the sound and acknowledge alerts.
•
CAM(Client) receives distribution of alert information from alert management server and display.
When only CAM(Client) is enabled, alerts that CAM(Client) can display decrease because
CAM(Client) cannot receive distribution of alert information. CAM(Client) cannot also transfer
alerts to BNWAS, because the function to transfer alerts to BNWAS is the function which not
CAM(Client) but alert management server should play a role.
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Section 3 Bridge Alert Management (BAM)
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