ITU-T N 4-1988 DEFINITION AND DURATION OF THE LINE - UP PERIOD AND THE PREPARATORY PERIOD《定义和期限线追踪期间和筹备期间-维护国际声音节目和电视传输电路的第4研究组 第1页》.pdf

1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 . TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU-!).4%.!.#%G0G0/ and preparatory periodThe period during which these broadcasting organizations do their own adjustments, tests and other work before the sound-programme transmission itself commences.1 Line-u

2、p period1.1 DurationIn principle, the duration of the line-up period should be 15 minutes. However, in the case of sound-programme transmissions involving more than two countries, the duration may be increased. On the other hand, incertain cases, by agreement between the Administrations concerned, t

3、he duration may be less than 15 minutes, providedthe line-up is properly carried out. This may be possible, for example, when there are two successive internationalsound-programme transmissions on the same route and the second involves extending the international sound-programme link already laid up

4、 for the first.Note In the case of multiple destination transmissions the line-up period can have a longer duration, to befixed by agreement between the Administrations concerned, e.g., on the order of 25 to 30 minutes.At the end of the line-up period the international sound-programme link and the c

5、ontrol circuits are handedover to the broadcasting organizations at the booked time.2 Preparatory period2.1 Beginning and durationWhen the tests during the line-up period are completed, the international sound-programme link is not madeavailable to the broadcasting organizations at the two ends unti

6、l the time fixed for the beginning of the preparatoryperiod. The chargeable time for the sound-programme transmission commences at the beginning of the preparatoryperiod. The duration of the preparatory period i.e. the time between handing over the international sound-programmelink to the broadcasting organizations and the moment when the programme properly begins - is chosen in each case bythe broadcasting organizations so that they can carry out all the tests and adjustments necessary before proceeding withthe sound-programme transmission.