Open interfaces in wireless network This topic has 1 reply, 1 voice, and was last updated 21 years, 11 months ago by Shashi. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts 15th December 2001 at 05:06 #33704 V. Srinivasa RaoGuest What is Open interface IOS V4.0 stands for. With reference to A1/A2 to A10/A11. what protocols used with reference OSI. I’ll be happy to receive any meterial as attachments on my personal email ID email@example.com. 30th December 2001 at 15:31 #33705 ShashiGuest Mr.Rao, As for as I know IOS V4.0 is protocol used for A-interface i.e between MSC and BSC, when using CDMA for air interface. Correct me if Iam wrong. Author Posts Viewing 2 posts - 1 through 2 (of 2 total) The forum ‘Telecom Design’ is closed to new topics and replies.