倔强不能 发表于 2025-3-28 18:18:13

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无目标 发表于 2025-3-28 20:59:30

Subscriber Access,is the digitization of the subscriber line (see Fig. 3.4). The majority of the internationally agreed ISDN specifications (see list of CCITT Recommendations of the I Series in the Annex to this book) on which the following remarks are based therefore deal with subscriber access.

Lobotomy 发表于 2025-3-28 23:07:55

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查看完整版本: Titlebook: ISDN - The Integrated Services Digital Network; Concepts, Methods, S Peter Bocker Book 19881st edition Springer-Verlag Berlin Heidelberg 19