In a Frame Relay network, committed information rate (CIR) is the bandwidth for a virtual circuit guaranteed by an internet service provider to work under normal conditions.
Committed data rate (CDR) is the payload portion of the CIR.
[1] At any given time, the available bandwidth should not fall below this committed figure.
[a] The provider guarantees that the connection will always support the CIR rate, and sometimes the EIR rate provided that there is adequate bandwidth.
The PIR, i.e. the CIR plus EIR, is either equal to or less than the speed of the access port into the network.