The restaurant uses tablet/PC/POS for cashier and printer for kitchen/bar which is connected to the cashier's device via LAN network. Provide guests with wi-fi connection.
In this case, the restaurant should install the network as follows:
Install 1 Modem directly connected to the provider's network line.
Install 1 Router connected to the Modem.
All devices of the staff (including printer in kitchen/bar) are connected to the Router.
All devices of the guests are connected to the Modem
