DSC "insopportabile"

[utente non attivo]

Un po' di chiarezza per evitare che la fantasia che ho letto in alcuni messaggi possa creare esclusivamente confusione e cattiva informazione.

Recommendation ITU-R M.493-15 - Digital selective-calling system for use in the maritime mobile service

13.1 Audible alarms
[cut] This alarm occurs at the initiation of the received non-distress DSC automated procedure when the category of the initiating DSC message is “urgency”. The characteristics of this alarm should not be able to be altered.

***** It should be possible for the operator to disable all audible alarms except those of category distress and urgency ***

12.5 Automatic channel switching function on VHF
Automatic switching to a subsequent communications channel on receipt of a DSC call may be implemented on VHF equipment. Prior to an automatic switch to the proposed frequency or channel, the user should accept the change, which should be carried out after the acknowledgement.
Automatic switching to a subsequent communications channel on receipt of a DSC call might in some cases disrupt important ongoing communications. Where such capability exists, a means for disabling that function should therefore be provided for all calls other than individual station calls of category
distress or urgency.
The DSC equipment should provide visual indication that the automatic switching function is disabled.