Illustrated in this figure is the forecast transition from standard broadband (as provided by ILECs today on copper cable with DSL or T-Carrier) to very-high-speed broadband (mostly on fiber) that operates at 24 Mb/s or above. The figure assumes that ILECs capture about one-half of the very-high-speed market, meaning that ultimately total ILEC lines stabilize at about 100 million. However, to accomplish this, ILECs must evolve from predominately circuit-switched, narrowband, copper-based networks to packet-switched, broadband, optical-based networks. This will not be easy because competition will be simultaneously stranding large quantities of network investment. The long-run alternative is illustrated by the dashed line in Figure 1.2 with total ILEC access lines falling to 63 million lines by 2015 and 43 million by 2020.