List and briefly define the ATM service categories.

What are the main service categories ?
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"Constant bit rate: provides a fixed data rate that is continuously available during the connection lifetime, with a relatively tight upper bound on transfer delay. Realtime variable bit rate: intended for time-sensitive applications; that is, those requiring tightly constrained delay and delay variation. The principal difference between applications appropriate for rt-VBR and those appropriate for CBR is that rt-VBR applications transmit at a rate that varies with time.. Non-real-time variable bit rate: with this service, the end system specifies a peak cell rate, a sustainable or average cell rate, and a measure of how bursty or clumped the cells may be. With this information, the network can allocate resources to provide relatively low delay and minimal cell loss.. Available bit rate: designed to improve the service provided to bursty sources that would otherwise use UBR. An application using ABR specifies a peak cell rate (PCR) that it will use and a minimum cell rate (MCR) that it requires.. Unspecified bit rate: a best-effort service. Guaranteed frame rate: designed to optimize the handling of frame-based traffic."
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"Atm machine offers five instructional classes of service:  Frequent Tad Charge per unit (CBR)  Variable Tad Pace-Real Time (VBR-RT)  Varied Bit Charge per unit-Not for-Real Time (VBR-NRT)  Usable Little bit Charge (ABR)  Unspecified Touch Charge (UBR)"
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