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Erschienen in:
1992 | OriginalPaper | Buchkapitel
Transmission Methods in the ISDN
verfasst von : Dr. rer. nat. Peter Bocker
Erschienen in: ISDN The Integrated Services Digital Network
Verlag: Springer Berlin Heidelberg
Enthalten in: Professional Book Archive
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According to its CCITT definition [7.1], the ISDN is based on the digitized telephone network. It can therefore use the same digital transmission systems as the telephone network on the interexchange (trunk) circuits. However, in order to use the subscriber lines for ISDN basic accesses at 144 kbit/s (cf. Sect. 4.2.1.2), new transmission methods must be employed, although existing cables can be retained. Moreover, for the B-ISDN access, an optical fiber has to be provided.