Imagine a fully offline system. The only way to interact with it is by sitting directly next to it. Instead of a NIC it has an employee with a telephone on her

Imagine a fully offline system. The only way to interact with it is by sitting directly next to it. Instead of a NIC it has an employee with a telephone on her desk. I'm just making things up, but this seems like a way to position the phone system as a bottleneck.