isdn d-channel signalling This topic has 1 reply, 1 voice, and was last updated 20 years, 7 months ago by Reval. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts 18th August 2003 at 11:46 #36339 rajan sharmaGuest dear sir, can u explain me in detail the signalling & pattern of d-channel in isdn signalling/lines. also wht is the role of NT1 23rd August 2003 at 07:50 #36340 RevalGuest Give a search in Google.com, u’ll find all you needed. regds. Author Posts Viewing 2 posts - 1 through 2 (of 2 total) The forum ‘Telecom Design’ is closed to new topics and replies.