100 MBits/sec? Cisco predicts, by 2013, 500% increase in the traffic over global networks based on the increased resolution of screens and power of computers to support massive data traffic. Nice graph showing, if we don't go to 100, then we assume downstream traffic speed will level off from historical growth from 1990s. Why not all wireless? Cisco research = fixed line traffic will dwarf mobile. Laws of physics cannot be broken -- limits in spectrum, will run out of tweaks of the wireless technology, but mostly, it's about the increased number of cells available for mobile transmission. And, how does data get OUT of the cells? Fibre. Moreover, if we have to build many more cells, then this is likely to be just as expensive. Also notes the very low AVERAGE speeds of wireless because of sharing. Note too the problems of being at the edge of the cell -- which can reduce single-user speeds by a factor of 10-20. Wireless still important, but it is not the only solution. Quigly explains NBN relationship with ISPs backhaul etc. -- Critical point -- NBN is NOT going above layer 2, and will mainly focus on fibre from premises to Points of Interconnect. only where there is a single backhaul provider to a PoI will NBN then aggregate traffic from that PoI and haul it to another one where there is competitive backhaul provision. Essentially, the NBN will be putting in backhaul mainly in regional areas (as indeed NextGen is already