An optical component has a plurality of parallel noncontiguous optical conduits of at least one protrusive phase material embedded in a recessive phase material that acts as a support structure. It is determined whether predetermined conditions are met so that a substantially simultaneous transmission of a first and second radio links to said radio terminal can be selected. The tugboat is operated utilizing battery power only and the generators are used to provide additional power if needed or to recharge the batteries. The two boards are interconnected by means of signals. A second channel state information is estimated from the at least one preamble symbol and the virtual training symbol.