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1 OPERATIONAL OVERVIEW
1-7
1.9 System Characteristics
1.9.1 Equipment priority
Equipment priority order is as below.
1. DMC
2. Control unit sending distress alert
3. Control unit 1 – routine use
4. Control unit 2 – routine use
5. NBDP
1.9.2 Controls become inoperative
Controls become inoperative in the following conditions:
• Controls of idle control unit in the two-control unit system when other control unit goes
OFF HOOK.
• Controls of idle control unit in the two-control unit system when other control unit
switches to the DSC mode.
• Distress received by DMC (Distress Message Controller).
• NBDP is scanning or communicating.
• Distress alert or distress relay is transmitted.
• Call other than distress is transmitted (transmission time about 8 s). If it becomes
necessary to unlock the keyboard before the message is transmitted, press the
[CANCEL] key to cancel the call.
1.9.3 Controls become operative
Controls become operative in the following conditions:
• [DISTRESS] button is pressed.
• Control unit having highest priority is operated.
• Other control unit in two-control unit system goes ON HOOK.
• Distress received by DMC is acknowledged.
• NBDP stops scanning or communicating.
1.9.4 Automatic setting of working frequency
The radiotelephone automatically sets working frequency in the following conditions:
• ABLE ACK is sent in response to individual call.
• Your ship receives ABLE ACK in response to own ship-initiated individual call.
• Your ship sends all ship call.
• Your ship sends distress relay.
• Your ship sends distress alert.
• Your ship receives group call or area call.
• Your ship receives distress relay call.
• Your ship receives distress alert.