For ARQ communications with a Public Correspondence Coast Station, which sequence of events best describes reaching the point in time where the text of TELEX communications should be sent.
• ARQ (Automatic Repeat reQuest) telex calling sequence with a public coast station • Role of SELCAL (selective calling) and answer-backs (WRU/AAB) in setting up the link • When the operator should send message text/TELEX codes versus call‑setup signals
• In an ARQ TELEX call, what must be fully completed before any message text or automatic TELEX codes are sent? Think about link establishment and confirmation. • Which steps are related to setting up the call (getting the attention of the coast station) and which are related to actually exchanging messages? • Compare the options: which one clearly separates call setup (including answer‑backs) from the stage where you start sending the structured TELEX message elements (like DIRTLX, MSG, etc.)?
• Make sure the exchange of answer-backs (WRU/AAB) happens before you start sending the main TELEX message content. • Confirm that SELCAL/Initiate Call appear (if required) before answer‑backs, since they are part of calling the coast station, not sending the message itself. • Verify that the step where you send items like DIRTLX / MSG / GA comes only after the circuit is established and operator control has been passed (e.g., via OPR+ or similar).
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