1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 5 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU4%,%2!0(G0G037)4#().2!$)/4%,%8G0G0).4%27/2+).%.%2!,G0G02%15)2%-%.43G0G04/G0G0“%G0G0-%4).G0G0).4%2(b) that the CCIR is charged with the task of making Recommendations relating to the radio path;(c) that explan
2、ation 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 recommendsthat the following points should be taken into consideration when interfacing the maritime “direct printing“system to the te
3、lex network:1 General1.1 The maritime “direct printing“ system should be capable of interfacing the international telex network in one ormore 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
4、 to maritime store-and-forward units, in accordance with procedures defined in Series F and U Recommendations for store-and-forward accessby terrestrial subscribers.1.2 Answerback signals from the ship should be obtained both at the beginning and at the end of the call. Whensuch signals are transmit
5、ted into the telex network, the coast station should make sure that they consist of 20consecutive 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 terr
6、estrial connection (ifany) must be cleared down and a new connection established for the next telex message. This should apply also whenthe 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 ser
7、vice codes receivedfrom the telex network.1.5 For land originated calls, service codes should be returned to the telex network in accordance withRecommendation F.131.2 Special conditions related to ship originated calls2.1 The selection signals received from the ship should have formats in accordanc
8、e with Recommendation F.60, 3.2.2.2.2 When accessing a maritime store-and-forward unit, the call control procedures should be in accordance withthe relevant Recommendations in the Series F and U.2.3 For direct access into the telex network, the normal telex procedures given in Recommendations U.1, U
9、11 andU.12 should be followed. In particular, the requirements given in these Recommendations with regard to the sendingof selection signals, end of selection signals and class of traffic signals should be observed: Recommendation U.1, 6,2 Fascicle VII.2 - Rec. U.63 Recommendation U.11, 7 and 9, Re
10、commendation U.12, 3.5.3 Special conditions related to land originated calls3.1 For direct access from the telex network, the time-out requirements of Recommendation U.1. U.11 andU.12 should be observed:Types A and B signalling (Recommendation U.1)The time from the end of selection, combination No.
11、26 (+), or last selection character received and the returnof 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 notexceed 60 seconds (see Table 1/U
12、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 notexceed 90 seconds (see Recommendation U.12, 3.11).Note It should be noted that for types A, B and C sign
13、alling, 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 pathsignalling 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 appropriateservice code, a store-and-forward unit for forwarding the call to the ship.4 Maritime group callsThe provisions given in Recommendation U.62, 4 apply.
