UBR Without PCR (Unspecified Bit Rate without Peak Cell Rate): UBR service is suitable for applications that can tolerate variable delays and some cell losses. Applications suitable for UBR service include text/data/image transfer, messaging, distribution, and retrieval and also for remote terminal applications such as telecommuting.
UBR With PCR (Unspecified Bit Rate with Peak Cell Rate): The amount of bandwidth is characterized by a Peak Cell Rate (PCR). UBR with PCR is connections that transport variable bit rate traffic for which there is no reliance
on time synchronization between the traffic source and destination and under the Peak Cell Rate.
CBR (Constant Bit Rate): Used by applications that require a fixed data rate that is continuously available during the connection time. It is commonly used for uncompressed audio and video information such as video conferencing, interactive audio (telephony), audio/video distribution
such as television, distance learning, and pay-per-view, and audio/video retrieval such as video-on-demand and audio library.
Non Realtime VBR (Non-Real-time Variable Bit Rate): Can be used for data transfers that have critical response-time requirements such as airline reservations, banking transactions, and process monitoring.
Realtime VBR (Realtime Variable Bit Rate): Used by time-sensitive applications such as real-time video. Rt-VBR service allows the network more flexibility than CBR
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