um to a-bis interface This topic has 0 replies, 1 voice, and was last updated 21 years ago by howie. Viewing 1 post (of 1 total) Author Posts 11th May 2003 at 12:34 #35618 howieGuest anyone knows how data on the Um interface is passed onto the A-bis interface? Author Posts Viewing 1 post (of 1 total) The forum ‘Telecom Design’ is closed to new topics and replies.