7-A-089: MF-HF: ARQ Operation #2: Answerbacks
7-89J1:
After establishing contact with a Coast Station on an available channel, which of the following exchanges take place?
After exchanging answer-backs (WRU/AAB) the coast station transmits GA+?.
The vessel will request the shore station's answerback to confirm it has reached the correct station, then the shore station operator will request billing authorization.
The ship station begins transmitting the text.
None of these
7-89J2:
During SITOR ARQ operations through a coast station, what should the GMDSS operator do during the "Automatic Exchange of Answerbacks"?
Do nothing other than wait for a GA+? prompt.
Send a "WRU" then a "Here is" when requested by the coast station.
Send the necessary message file and then wait for time and charges.
None of the above
7-89J3:
Assuming sending a direct telex message to a shore-based office, which sequence of events best describes a complete ARQ telex exchange with a coast station?
Initiate call, observe phasing, wait for exchange of answer-backs (WRU-AAB), send DIRTLX command with zero, TELEX country code, TELEX number, send message, send KKKK to terminate the telex link, receive MRN and time and charges.
Initiate call, observe phasing, wait for exchange of answer-backs (WRU-AAB), send message, send KKKK to terminate the telex link, receive MRN & time and charges.
Initiate call, observe exchange of answer-backs (WRU-AAB), send message, send KKKK to terminate radio link, receive MRN & time and charges.
Initiate call, observe phasing, exchange of answer-backs (WRU-AAB), send message, send KKKK to terminate radio link, receive MRN & time and charges.
7-89J4:
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.
Transceiver setup, SELCALL selection, Initiate Call, wait for exchange of answer-backs (WRU-AAB), GA+?, enter DIRTLX xy+, MOM, MSG+? and exchange of terminal answerbacks.
Transceiver setup, SELCALL selection, Initiate Call, wait for exchange of answer-backs (WRU-AAB), OPR+, operator entry of the appropriate automatic telex code.
Transceiver setup, wait for exchange of answer-backs (WRU-AAB), OPR+, operator entry of the appropriate automatic telex code.
Transceiver setup, wait for exchange of answer-backs (WRU-AAB), GA+?, operator entry of the appropriate automatic telex code.
7-89J5:
During ARQ communications, A Coast station will likely break the phased radio connection:
If either a) or b) takes place
If the error percentage of repeat requests becomes too high.
If the automatic exchange of answerbacks is interrupted by keyboard entries.
If the operator enters "KKKK".
7-89J6:
During ARQ communications, A Coast station will likely break the phased radio connection:
If any of the above actions takes place.
If the error percentage of repeat requests becomes too high.
If the automatic exchange of answerbacks is interrupted by keyboard entries.
If the operator enters "BRK+".
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Color key:
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● = Unseen
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● = Weak
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● = Review
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● = Learned
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● = Incorrect answer
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