This is the 5766th most frequent Russian word.
пропускной
"Пропускной" means "passable" or "relating to admission or throughput."
The word 'пропускной' is used as an adjective related to 'пункт', describing a 'checkpoint' (literally 'through-pass point'). It highlights a place where passes or entry permissions are checked.
Студенты проходили через пропускной пункт перед входом в здание.
The students passed through the checkpoint before entering the building.
Here, 'пропускной' describes 'способности', referring to 'throughput' in network terms, meaning the ability of the network to pass data through effectively.
Производительность пропускной способности сети была увеличена.
The throughput capacity of the network was increased.
In this case, 'пропускной' modifies 'клапан', meaning 'flow valve', a component that regulates the passage or flow of a substance.