Content delivery by a network node in a network is optimized. This prevents a transistor structure closest to the drain region from first deteriorating. A controller is configured to identify a second pacing site from the plurality of pacing electrode sites in response to the activation times measured during pacing at the first site. Subsequently, a trench is patterned in the upper dielectric layer and the etch stop feature at least in part by utilizing the etch stop feature as an etch stop. Associated to the aforesaid conveyor structure are active and passive fins for enabling an adequate cooling of the components of the engine unit or electronic components associated thereto during given operating conditions.