How to set up public Wi-Fi at your business

"Businesses with existing private Wi-Fi network might be able to offer public or guest access safely without purchasing additional hardware. Some consumer and small-office wireless routers offer a guest access feature. When guest access is enabled, users will see another network name (known as an SSID) in the list of available networks on their Wi-Fi devices, and its access will be separated from the main network.

Business-class routers and access points (APs) typically offer multiple SSID and virtual LAN (VLAN) features. When these features are set up properly, multiple wireless network names (SSIDs) can be broadcasted with varying levels of security, one of which could be a  guest network safely segregated from your private network.

To offer public or private Wi-Fi access over a larger area that a single wireless router doesn't cover, one economical option is Open Mesh. It's designed to provide both private and public wireless access easily, with hotspot features including a captive portal and speed limits. Plus, it uses the wireless mesh technique, which means that all the wireless APs have to be wired back to the router or switch, making installation easier. "

http://www.itnews.com/management/57973/how-set-public-wi-fi-your-business

"Offering wireless Internet access for guests can open new doors for your business. For a cafe or restaurant, customers are more likely to stay longer, purchase more items, and return knowing they can use a Wi-Fi connection. For motels and hotels, Wi-Fi is one of travelers' deciding factors when selecting where to stay. Offering guest wireless access from an otherwise private office can be beneficial too, as it provides outside associates, contractors, and other visitors with a reliable Internet connection."