Generally, if you need fast Internet access for a few employees or access for larger offices that will only use the Internet rarely, ISDN access might be your best solution.
  

However, if your company needs blazing fast access to the Internet for few or all your employees, Frame Relay access becomes the most cost-efficient solution. Frame Relay can also be used to host web and email servers in house if needed, making it a scalable investment for anyone.
  

Both ISDN and Frame Relay service requires you to purchase a modem or router. If they are to be used for multiple employees, the routers need to connect to your existing LAN through Ethernet.

Finally, both options also need special lines to be installed at your location, so please plan at least two weeks in advance for line installation from your local telephone company.