Datalink Connection Identifiers or DLCIs are a locally significant numeric value to represent each end point. Multiple PVCs can be mapped to the same physical end point. It is often provisioned with a Committed Information Rate (CIR) and a burstable component sometimes known as Extended Information Rate (EIR).
Frame relay was designed to make more efficient use of existing physical resources, thereby allowing the overprovisioning of data services to telco customers, as most clients are unlikely to be utilising a data service 100 percent of the time. Frame relay has acquired a bad reputation in some markets because of excessive bandwidth overbooking by telcos.
Frame relay is/was often sold by Telecommunications companies to businesses looking for a cheaper alternative than dedicated lines, its use in different areas depending on governmental and telecommunication's companies polices.