FTZ 1 TR 6: Difference between revisions
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{{Expand German|FTZ 1 TR 6|date=November 2025}} | |||
{{Unreferenced|date=December 2009}} | {{Unreferenced|date=December 2009}} | ||
'''FTZ 1 TR 6''' (or '''1 TR 6''') is the standard for the obsolete [[Germany|German]] national [[Digital data|digital]] signalling protocol ([[D channel]] protocol) used for the [[Integrated Services Digital Network|ISDN]]. It has been superseded by [[DSS1]] but is still in use on some lines and [[Private branch exchange|private exchanges]]. | '''FTZ 1 TR 6''' (or '''1 TR 6''') is the standard for the obsolete [[Germany|German]] national [[Digital data|digital]] signalling protocol ([[D channel]] protocol) used for the [[Integrated Services Digital Network|ISDN]]. It has been superseded by [[DSS1]] but is still in use on some lines and [[Private branch exchange|private exchanges]]. | ||
Latest revision as of 19:49, 11 November 2025
Template:Expand German Script error: No such module "Unsubst".
FTZ 1 TR 6 (or 1 TR 6) is the standard for the obsolete German national digital signalling protocol (D channel protocol) used for the ISDN. It has been superseded by DSS1 but is still in use on some lines and private exchanges.
1 TR 6 did not support multiple subscriber numbers but featured an Endgeräteauswahlziffer (EAZ, German "user device selection digit"). ISDN subscribers would get a sequence of 10 subsequent subscriber numbers, the last digit of which being the EAZ. The EAZ "0" was used for "global calls" to all connected devices.
1 TR 6 also offered semipermanent connections, which were (comparatively cheap) leased lines that could be temporarily disabled to use the B channel for other purposes.
It is said that the "TR" simply stands for "technische Richtlinie" (technical guidelines).
External links
- Script error: No such module "citation/CS1"..