@jauhar123 | Updated 21 Aug. 2019
Each time the checkout operator collects more than a certain quantity of cash, they dispatch it securely to the cashier's department utilizing the Pu Tube. For simplicity, let's imagine we're linking one checkout with the cashier's department. The checkout has a considerable metal box called the shipping station with a door that unfolds onto a tube. Some systems beget doors that lock with keys or start with numeric keypads and PIN estimates; others are unsecured.
The tube (a pipe composed of something like PVC plastic or a robust lightweight metal before-mentioned as aluminum) moves all the way to the cashier's department, often only a little objective but sometimes up to 600m (~2000ft) or so. At the cashier's department, the tube attaches to an extra sophisticated box called the receiving station, which may also have a lockable door.
This is sometimes also described the powered station, because it provides the air power that drives packages back and forth. It's mostly the same as the shipping station, but it possesses a compressed air pump attached that can either absorb air from the tube or ***** air into it according to which way under the tube packages needs to be sent.
Most of the time the taking station will be accumulating cash packages from the checkouts so it will be set to drawing mode (also called vacuum mode). This means the compressor will be acting as a vacuum cleaner, so it sucks air along the tube from the sending station. If someone wants to transfer cash from the sending station, they place it into a sturdy cylindrical, plastic canister (only slightly tinier than the tube and very snugly fitting), place it in the container in the sending station, and close the door.