Definitions for "Unspecified bit rate"
Keywords:  ubr, tolerant, atm, delay, isused
See UBR.
The UBR service class is intended for delay-tolerant or non-real-time applications, or those which do not require tightly constrained delay and delay variation.
An ATM service category that is used for data traffic such as TCP/IP,which can tolerate delays. UBR does not reserve any bandwidth for a connection.