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In frame relay networks, the committed information rate (CIR) is the bandwidth that is allocated to a logical connection in a permanent virtual circuit (PVC). The bandwidth is guaranteed by the provider even if other customers are sharing the same physical connection over frame relay. The bandwidth is expressed in kilobits per second.
With frame relay networks, multiple customers can share the same physical wires using virtual circuits. Since different customers have different bandwidth needs, providers can designate faster connections to those who need them with a committed information rate. A streaming video provider running a content delivery network needs more throughput than a customer primarily sending text data, for example. Under a CIR, a customer is guaranteed a certain bandwidth under a service level agreement. Frame relay connections are also usually burstable with an excess information rate (EIR) or peak information rate (PIR).