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CBR vs VBR | Difference between CBR and VBR

This page compares CBR (Constant Bit Rate) vs VBR (Variable Bit Rate) and mentions difference between CBR (Constant Bit Rate) and VBR (Variable Bit Rate).

CBR-Constant Bit Rate

• Used for timing sensitive traffic e.g. voice, interactive video-conferencing.
• Provides constant data rate
• Provides consistent delay across the network.
• Example: ATM network

VBR-Variable Bit Rate

• There are two modes VBR-nrt and VBR-rt
• Used for bursty data applications
• Provides pre-assigned and variable data rate.
• Examples of VBR-rt: compressed video,audio in tele-conferencing as well as multimedia applications

Following table mentions basic difference between CBR (Constant Bit Rate) and VBR (Variable Bit Rate).


Features CBR-Constant Bit Rate VBR-Variable Bit Rate
Traffic type Steady Bursty
Timing Delay variation sensitive Insensitive to minimal delay variation (VBR-nrt)
Delay variation sensitive (VBR-rt)
Applications Video conferencing, video, PBX Data and imaging in VBR-nrt (non realtime), compressed video, audio and tele-conferencing in VBR-rt (realtime)

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