(Telecompaper) Telefonica is preparing to spin-off its domestic infrastructure unit for sale by mid-2016, according to an unnamed source cited by Reuters. The company is pursuing a so-called 'dual track' process that will seek to list or make a trade sale of the unit to be made up of Telefonica's 11,500 masts in Spain as well as data centres and domestic subsea cables. "The process has started, the new unit will be formally registered very shortly and Telefonica wants to move quickly on those plans," said the source, adding that the unit could be valued at EUR 5-6 billion.