The article combines national FTN history with one anonymous later-generation trunk-network link station. The focal station is a thick-walled green concrete bunker protected against EMP, with a 40 m antenna mast, ventilation/temperature control, dual diesel generator sets, batteries for no-break transition and large diesel tanks for endurance. Trunk nodes are terrain-adapted, protected against sabotage and bomb effects and may connect a high-importance subscriber by four diverse routes (two radio and two cable). No building area, wall thickness, foundation size, equipment count or cost is given.

height_m: value: 40 | scope: antenna mast at the focal station | evidence: Explicitly reported. | inner_structure: Later-generation thick-walled concrete protected technical building; the article does not describe it as a rock cavern. | other: Antenna carriers have substantial foundations, but dimensions are absent.; A high-importance subscriber may have four diverse network paths, half radio and half cable; this is a network-design example, not necessarily the photographed node.

EMP protection.; Bomb- and sabotage-resistant physical shell and intrusion alarm.; Ventilation and temperature control.; Dual diesel generator sets.; Battery reserve for uninterrupted power until generators are online.; Large diesel storage for prolonged operation.; Radio-link antennas/mast, cable routes, telephone/data transmission and remote network supervision.; Protected-site access controls.

Secure concrete technical building and mast foundations.; 40 m antenna mast and radio-link equipment.; Dual generators, batteries, fuel and power conditioning.; Cooling/ventilation and EMP shielding/bonding.; Transmission, switching, monitoring and diverse cable/radio interfaces.; Physical security and intrusion detection.

The cost subject should be one anonymous trunk node. Network milestones, capacities and four-route examples describe FTN generally and must not be priced as though every item belongs to the photographed facility.

Held after source-specific review.

Building footprint, usable area and number of levels.; Wall/roof thickness and reinforcement.; Mast type, foundation size and antenna loading.; Generator ratings, fuel volume and battery autonomy.; Cooling load and protected-ventilation specification.; Transmission/switching inventory and current mission-equivalent capacity.; Site civils, cable routes and security perimeter quantities.

The article repeatedly switches between the national FTN and one focal station; national attributes should be tagged as archetype/program evidence.; The model's 350 m² / 3,767 ft² is an assumption and must not be reported as published area.; The focal building is described as concrete; do not substitute a rock-cavern archetype without new evidence.