A valve seat section is formed on a valve body having first and second ports. The network typically comprises a first server including a first network interface card that connects the first server to a central switch and a second server including a second NIC that connects the second server to the switch. Its production takes place in a continuous two-stage flow reactor at weakly acidic conditions and high redox. Each of the secondary signal paths includes a scaling stage and a shaping stage each with programmable bias current. The base station selects subsets of the set of available sets of antennas, and indicates the selected subset of antennas to the transceiver.