Quote:What is the Energy Usage on FTTN?
No new power stations will need to be built because of choices about the NBN. Yes, a fibre to the node network does use more power than a fibre to the premises network, but the differences per user are very small, and advancing technology mean the gap is narrowing over time.
A study by University of Melbourne researchers (Baliga, J., Ayre, R., Hinton, K., & Tucker, R., 2010, “Energy Consumption in Wired and Wireless Access Networks”, in IEEE Communications Magazine, pp.70-77) predicted by 2014, the power used by FTTN would decline by around 30%, making it similar to legacy DSL power consumption. This seems to be happening in the real world, as new equipment is introduced. For instance, the Alcatel-Lucent 7330 node which recently cames to market uses 25 per cent less energy for VDSL2 services (VDSL is a technology for broadband over copper used at the edge of FTTN networks). This is consistent with the experience in the U.K. where the move to FTTN has lowered BT’s overall power consumption.
Regardless, the differences in energy use between FTTP and FTTN do not materially affect the business case for either.Various studies show the savings per user per year of FTTP compared to DSL are around $5 per year. According to Verizon, annual central office power usage is 32 kWh for a DSL line and 12 kWh for a FIOS line. If electricity costs 25 cents per kWh, a move from copper to FTTP therefore cuts annual energy costs per line from $8 to $3. (Weller, D., Verizon (2008) ‘Do All Roads Lead to NGN?’ presentation, 13 Oct 2008, p.9.)
One factor that those keen to talk about energy savings from FTTP always overlook is that at present, around 90 per cent of consumer bandwidth is used for video – and that means bigger screen displays (with their relatively high power use) are part and parcel of any increase in bandwidth usage. In other words any increase in power demand occasioned by broadband, FTTP or FTTN, is likely to be a consequence of the devices acquired by consumers to enjoy the services it offers.