General Requirements to Be Met in Interfacing the International Telex Network with the Maritime"Direct Printing" System - Telegraph Switching (Study Group IX) 2 pp
1.1
one or more ways:
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The maritime “direct printing” system should be capable of interfacing the international telex network in
in accordance with Recommendations U.l, U.ll and U.12 for direct real-time operation,
in accordance with Recommendation F. 132 for ship originated access to maritime store-and-forward
units,
in accordance with procedures defined in Series F and U Recommendations for store-and-forward
access by terrestrial subscribers.
1.2 Answerback signals from the ship should be obtained both at the beginning and at the end of the call.
When such signals are transmitted into the telex network, the coast station should make sure that they consist of
20 consecutive characters and are sent at cadence speed.
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The answerback should be in accordance with Recommendation F.130.
1.3 If the coast station detects an end of telex message signal from the ship, the existing terrestrial connection
(if any) must be cleared down and a new connection established for the next telex message. This should apply also
when the next message is intended for the same terrestrial subscriber.
1.4 For ship originated calls, the coast station should be capable of returning to the ship any service codes
received from the telex network.
1.5 For land originated calls, service codes should be returned to the telex network in accordance with
Recommendation F.131.