ATM in telecommunications is a standard for digital transmission of multiple layers of data that includes voice, data, and video signals. It was designed with cells in mind. It is the key to the internet bandwidth problem. ATM creates fixed routes between two points before data transfer begins. An ATM network is less adaptable to a sudden network traffic surge. The ATM provides data link layer services that run on the OSI’s layer 1 physical links. It functions similar to the small packet-switched and circuit-switched networks which make it ideal for real-time services like VOIP and video. ATM services generally have four different bit rate choices: Available bit rate, constant bit rate, unspecified bit rate, and variable bit rate.