For example, a CIR of 10 Mbit/s PIR of 12 Mbit/s allows you access to 10 Mbit/s minimum speed with burst/spike control that allows a throttle of an additional 2 Mbit/s; this allows for data transmission to "settle" into a flow. PIR is defined in MEF Standard 10.4 Subscriber Ethernet Service Attributes
To illustrate, a CIR of 10 Mbit/s paired with a PIR of 12 Mbit/s grants users access to a base speed of 10 Mbit/s, supplemented by burst control that enables an additional 2 Mbit/s boost; this helps data transmission "smooth out" into a steady flow. PIR is specified in MEF Standard 10.4 Subscriber Ethernet Service Attributes.