This Recommendation defines frame structures and multiplexing arrangements for the transport of SDH elements over existing PDH transport networks operating at G.702 hierarchical rates of 34368 kbit/s, 44736 kbit/s, 97728 kbit/s and 139264 kbit/s. It is envisaged that these frame structures could, unless otherwise indicated, be used for the transport of other signals (e. g. ATM cells).