Abis interface is tdm or atm? This topic has 2 replies, 1 voice, and was last updated 8 years, 10 months ago by sudha. Viewing 3 posts - 1 through 3 (of 3 total) Author Posts 17th November 2014 at 14:22 #69701 john brambleGuest wondering about abis interface, pdh/E1/2meg circuit. when we speak about the gsm traffic carried over the abis interface we can call that this circuit is TDM? my doubt is about if is TDM or ATM… thanks 29th November 2014 at 18:47 #69702 MerGuest Hi John Generally, the Abis interface use the E1 which is based on TDM concept. Br. 30th November 2014 at 16:54 #69703 sudhaGuest Tell me the Signal(Call) procees in BTS to BSC with the complete specifications about E1’s And TRX’s. Author Posts Viewing 3 posts - 1 through 3 (of 3 total) The forum ‘Telecom Design’ is closed to new topics and replies.