ITU-T G 631 FRENCH-1993 TYPES OF SUBMARINE CABLE TO BE USED FOR SYSTEMS WITH LINE FREQUENCIES OF LESS THAN ABOUT 45 MHz《用于行频低于45 MHz系统的海底电缆类型》.pdf

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ITU-T G 631 FRENCH-1993 TYPES OF SUBMARINE CABLE TO BE USED FOR SYSTEMS WITH LINE FREQUENCIES OF LESS THAN ABOUT 45 MHz《用于行频低于45 MHz系统的海底电缆类型》.pdf_第1页
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1、UNION INTERNATIONALE DES TLCOMMUNICATIONS5)4 4 G.631SECTEUR DE LA NORMALISATIONDES TLCOMMUNICATIONSDE LUIT3500/243 $% 42!.3-)33)/. #!2!#4 2)34)15%3490%3 $% # “,%3 3/53 -!2).354),)3%2 0/52 $%3 3934 -%3 / ,%3 apprciantaussi le fait que ceux qui font les projets de systmes en cble sous-marin doivent bn

2、ficier dune libertsuffisante en ce qui concerne le choix du cble afin de pouvoir obtenir un prix de revient gnral optimal par unit delongueur pour chaque systme;reconnaissantque, lorsquil sagit de dterminer si deux cbles diffrents peuvent tre raccords dans de bonnes conditions, lescaractristiques le

3、s plus importantes sont:- le diamtre intrieur du conducteur extrieur,- limpdance caractristique du cble,recommandeque, pour les systmes en cble sous-marin utilisant en ligne des frquences qui peuvent atteindre 45 MHz, lecble utilis dans les sections maritimes en eau profonde de ces systmes doivent respecter les limites indiques dans letableau 1/G.631.TABLEAU 1/G.631Diamtre interne du conducteur extrieurImpdance caractristiquede 25,0 25,5 mmde 43 46 Wde 37,0 38,5 mma) de 53 54 Wb) de 60 62 W43,2 mma) de 49 50 Wb) de 53 54 Wc) de 60 62 W

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