Peter Bocker 
ISDN The Integrated Services Digital Network [PDF ebook] 
Concept, Methods, Systems

From the reviews:Computer Communications"Although the concept of ISDN has been with us now for overa decade, and much development work has been carried out du-ring this period, there are very few comprehensive booksavailable on the subject. This is perhaps one of the best ofthem.The book aims to provide engineers and potential engi-neers with an overview of the requirements and features of ISDN that will be useful in thedesign, construction andoperation of such systems. The author and his six collabora-tors have succeeded in this respect, producing a readable, yet thorough, technical book that can be recommended to awider audience… Throughout the book the explanations are enhanced byclear, well-presented, relevant diagrams, and there is a very use-ful annex on the full set of standards relating to ISDN. This is a good book that will definitely be used as a refe-rence over the next few years by many engineers working inthe area…"IEEE Computer"ISDN is a slimbut very effective book dealing with almostevery aspect of the evolution ofpublic communications net-works…I highly recommend this book to engineerswho arenew either to the field of ISDN or to specific ISDN topics. It is clear, concise, and is excellent padding for thosetackling the CCITT recommendations."