ITU-T R 62-1988 SITING OF REGENERATIVE REPEATERS IN INTERNATIONAL TELEX CIRCUITS《国际用户电报电路中再生中断器的设置地点》.pdf

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1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 2 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU4%,%2!0(94%,%2!0(G0G042!.3-)33)/.3)4).G0G0/ amended at Geneva, 1956 and 1964,Mar del Plata, 1968 and Malaga-Torremolinos, 1984)The CCITT,considering(a) that insufficient experience has been acquired in the us

2、e of regenerative repeaters;(b) that it nevertheless seems desirable to lay down a provisional rule governing the siting of regenerativerepeaters, with a view to the preparation of plans for international telegraph communications by switching;(c) that it would also appear desirable that the signals

3、transmitted by an international terminal exchange shouldnot be affected by a higher degree of distortion than those recommended in Recommendations R.57 and R.58,unanimously declares the view(1) that, when the transmission quality demands it, Administrations agree with one another on the necessity fo

4、rinserting regenerative repeaters and for taking the necessary steps so that the location chosen ensures that the expensesare equally shared between the Administrations and is appropriate to the organization of their telex and generalswitching networks and to the quality of transmission that it is p

5、ossible to provide on complete connections;(2) that in the automatic intercontinental telex and gentex transit network (see Recommendation F.68 1),where regeneration is not inherently provided by time-division multiplex equipment or switches with inherentregeneration, start-stop regenerative repeate

6、rs shall be provided in the receive path of the connection at theintercontinental transit centreNote Start-stop regenerative repeaters and time-division multiplex equipment in accordance with CCITTRecommendations are generally suitable only for normal (50-baud, 5-unit code) telex and gentex operation. Specialuses of the automatic intercontinental transit network (cf. 7 of Recommendation U.11), involving other codes andspeeds, raise problems that have to be investigated.Reference1 CCITT Recommendation Establishment of the automatic intercontinental telex network, Rec. F.68.