In order to capture utilization charges in a packet data transmission network, a recording is made of the charges that become payable during the course of a transmission session, when a threshold charge-total is reached. Each memory transistor is also connected to an array select transistor. When a direction from a side SD1 to a side SD3 of the macrocell is defined as a first direction, the transmission drivers are disposed on the side of the pads for the DP and DM in the first direction and are disposed line-symmetrically about a line SYL, and the receiver circuit is disposed on the side of the transmitter circuit in the first direction. The die itself is attached directly onto the heat sink through a window on the dielectric and provides high power dissipation. The apparatus also includes material coated on the probe.