Encyclopedia > 1.TR.6

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1.TR.6 is a control channel protocol[?] for ISDN. It is a national standard in Germany but is being replaced by Euro-ISDN[?].
Based on material from FOLDOC, used with permission.

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... a particular tense of the verb with certain verbal auxiliaries, the most common of which are "to", various forms of "be", various forms of "have", and the conditional ...