1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 . TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU-!).4%.!.#%G0G0/b) reporting fault conditions to the circuit or link send reference station (see 2).1.5 The intermediate ISPCs are intermediate sub-control stations for the international sound-programme link.
2、1.6 The ISPC or the repeater station at the sending end (country A in Figures 2/N.1 and 5/N.1) is a terminal sub-control station for the international sound-programme connection. When a send reference station (see 2) is associatedwith a multiple destination communications-satellite link, it has the
3、following responsibilities:a) coordination of lining up the multiple-destination sound-programme circuit sections, circuits and links,respectively;b) keeping a record of the measurements made during the lining-up period of the circuit section, circuit orlink, and recording the quality assessments ob
4、served at control stations during the lining-up of the link;c) relevant maintenance action for the sub-control and control stations at the request of one of thesestations.However, the choice of the station nominated as the terminal sub-control station is left to the discretion of theAdministration c
5、oncerned.1.7 Exchange of contact point information on sound-programme transmission should be made in accordance withRecommendation M.93 3.2 Send reference stationsSound-programme transmissions provided on a multiple destination basis using a communication satellitesystem, differ from those using onl
6、y terrestrial facilities in that the common transmitting path extends through thetransmitting earth station to the satellite. The receiving paths extend from the satellite through the receiving earthstations concerned to the terminal ISPC control stations.2 Fascicle IV.3 - Rec. N.5Operations on the
7、common path of the connection affect all receiving stations, whereas on any of the otherpaths the operations affect only the one receiving terminal station involved. These distinctive features of a multipledestination sound-programme transmission provided in the above manner require the assistance o
8、f certain stationsdesignated as send reference stations.Send reference stations are situated along the common path of the sound-programme circuit or link and areidentified as follows:a) a sub-control station located at the transmitting terminal of the circuit section containing the spacesegment;b) t
9、he terminal sub-control stations for the circuit and link containing the space segment.Figure 4/N.1 shows the basic composition for a multiple destination sound-programme circuit routed via acommunication satellite system. The send reference stations are shown as R and R for the multiple destination
10、 circuitsection and circuit respectively.Figure 5/N.1 shows the basic composition for a multiple destination sound-programme link and connectionrouted via a communication satellite system. The send reference stations are shown as R and R for the multipledestination circuit and link respectively.References1 CCITT Recommendation Control stations, Vol. IV, Rec. M.80.2 CCITT Recommendation Sub-control stations, Vol. IV, Rec. M.90.3 CCITT Recommendation Exchange of contact point information for the maintenance of internationalservices and the international network, Vol. IV, Rec. M.93.
