Number: A3TH090690U595 Subject: Unshielded Twisted Pair Token-Ring Date: January 30, 1991 - - - - - - - - - - - - - - - - - - - - - - - - - GENERAL INFORMATION: 1) IBM says that the 16/4 board will work on unshielded twisted pair (UTP) at 16Mbits for runs less that 100 feet (that's 50 feet out and 50 feet back to the MAU). But if you have problems, they won't help. It has been reported that it works better with Proteon's series 70 intelligent MAUs. 2) If somebody has some IBM 16/4 boards and wants to run on UTP, Proteon puts out a media filter (much different than the standard type 3 media filter that IBM/ROLM puts out) that will work either with their MAU or IBMs. Full standard Token-Ring specifications are not supported. The biggest limit is 100 nodes versus the standard 255. The cable that runs to the workstation is up to 300 feet (standard for UTP TRN), but remember; this means out to the workstation and back. 3) We have seen some problems with other companies (Madge, TCC) that claim they can run at 16Mbits on UTP. Only IBM and Proteon are tested under IMSP (at 16Mbit). Other companies may work with shielded twisted pair. (X) This information was verified by the vendor.