ISDN was one of the first large scale digital transmission architectures implemented in Australia. It was based on multiplexing 64 kBit streams that were carried over the standard analogue telephone cable. Thirty two of these streams made up one PRI (Primary Rate Interface) which ran at 2 MB. Subsequent multiplexing gave streams of 8MB, 32MB and 64 MB. Garlands ISDN cable is predominantly designed to carry this 2MB stream although higher bit rate streams can also be carried. Over time the network migrated to ADSL, xDSL and other technologies. This cable that was originally designed for ISDN can still be used at the 2MB and 8MB rate for these newer and more advanced architectures.