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- Recommendation U.63
- GENERAL REQUIREMENTS TO BE MET IN INTERFACING THE INTERNATIONAL
- TELEX NETWORK WITH THE MARITIME "DIRECT PRINTING" SYSTEM
- (Malaga-Torremolinos, 1984)
- The CCITT,
- considering
- (a) that it is desirable that the interface between the international telex
- servi maritime "direct printing" system be
- defined;
- (b) that the CCIR is charged with the task of making
- Recommendations relating to the radio path;
- (c) that explanation of the details of the interface between
- the international telex network and the maritime "direct printing"
- system would be of assistance to the
- CCIR,
- unanimously recommends
- that the following points should be taken into consideration when
- interfacing the maritime "direct printing" system to the telex network:
- 1 General
- 1.1 The maritime "direct printing" system should be capable of interfacing the
- international telex network in one or more ways:
- - in accordance with Recommendations U.1, U.11 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.
- 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.
- 2 Special conditions related to ship originated calls
- 2.1 The selection signals received from the ship should have formats in
- accordance with Recommendation F.60, S 3.2.2.
- 2.2 When accessing a maritime store-and-forward unit, the call control
- procedures should be in accordance with the relevant Recommendations in the
- Series F and U.
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- Fascicle VII.2 - Rec. U.63 PAGE1
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- 2.3 For direct access into the telex network, the normal telex procedures
- given in Recommendations U.1, U.11 and U.12 should be followed. In particular,
- the requirements given in these Recommendations with regard to the sending of
- selection signals, end of selection signals and class of traffic signals should
- be observed:
- - Recommendation U.1, S 6,
- - Recommendation U.11, SS 7 and 9,
- - Recommendation U.12, S 3.5.
- 3 Special conditions related to land originated calls
- 3.1 For direct access from the telex network, the time-out requirements of
- Recommendation U.1, U.11 and U.12 should be observed:
- Types A and B signalling (Recommendation U.1)
- The time from the end of selection, combination No. 26 (+), or last
- selection character received and the return of the call connected signal
- should not exceed 60 seconds.
- Type C signalling (Recommendation U.11)
- The time taken from the end of selection signal, combination No. 26 (+),
- to the call-connected signal should not exceed 60 seconds (see Table
- 1/U.11, remarks relating to the call-connected signal).
- Type D signalling (Recommendation U.12)
- The time taken from the end of selection signal, CSC code No. 11, to the
- call connected signal should not exceed 90 seconds (see Recommendation
- U.12, S 3.11).
- Note - It should be noted that for types A, B and C signalling, the same
- timings pertain to service signals (NP, NC, NA, OCC, etc.), and that in addition
- for type D signalling the same timing pertains to the last backward path
- signalling characters and terminating-through-connection.
- 3.2 If the time-out requirements cannot be met, the coast station may offer
- the calling subscriber, by an appropriate service code, a store-and-forward unit
- for forwarding the call to the ship.
- 4 Maritime group calls
- The provisions given in Recommendation U.62, S 4 apply.
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- PAGE2 Fascicle VII.2 - Rec. U.63
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