ITU-T I 421 FRENCH-1988 PRIMARY RATE USER-NETWORK INTERFACE《一次群速率用户 网络接口》.pdf

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1、UNION INTERNATIONALE DES TLCOMMUNICATIONSUIT-T I.421SECTEUR DE LA NORMALISATIONDES TLCOMMUNICATIONSDE LUITRSEAU NUMRIQUE AVEC INTGRATIONDES SERVICES (RNIS)INTERFACES USAGER-RSEAU RNISINTERFACE DBIT PRIMAIREUSAGER-RSEAURecommandation UIT-T I.421(Extrait du Livre Bleu)NOTES1 La Recommandation I.421 de

2、 l UIT-T a t publie dans le fascicule III.8 du Livre Bleu. Ce fichier est un extraitdu Livre Bleu. La prsentation peut en tre lgrement diffrente, mais le contenu est identique celui du Livre Bleu et lesconditions en matire de droits dauteur restent inchanges (voir plus loin).2 Dans la prsente Recomm

3、andation, le terme Administration dsigne indiffremment une administration detlcommunication ou une exploitation reconnue. UIT 1988, 1993Droits de reproduction rservs. Aucune partie de cette publication ne peut tre reproduite ni utilise sous quelque formeque ce soit et par aucun procd, lectronique ou

4、 mcanique, y compris la photocopie et les microfilms, sans laccord crit delUIT.Recommandation I.421Fascicule III.8 - Rec. I.421INTERFACE DBIT PRIMAIRE USAGER-RSEAU(Malaga-Torremolinos, 1984)Les structures dinterface usager-rseau aux dbits primaires sont dfinies dans la Recommandation I.412. LesRecommandations I.431 (couche 1), I.440 et I.441 (couche 2), I/450, I.451 et I.452 (couche 3) contiennent desspcifications dtailles.Fascicule III.8 - Rec. I.421 1

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