German Historical FTZ Standards for ISDN, SS7 and more
A number of previously unavailable historical German national standards related to (mainly) ISDN have been uncovered and are now availale as PDFs from https://people.osmocom.org/laforge/ftz/ (and in more structured presentation with metadata at German_FTZ_ISDN_Specifications).
The standards include, among many others- 1TR6 - German National ISDN variant of the 1980ies, before Euro-ISDN was introduced in the 1990ies
- 1TR7 - German National SS7 dialect
- various physical layer specs for interfaces such as S2M, V2M, Uk0, Uk2, UG2 and more
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