In other words, the Committed Data Rate is the total committed bandwidth minus voice and non-data packets.

A Committed Data Rate, by contrast, is the guaranteed average bandwidth reserved exclusively for the data portion of the CIR. At any time, the bandwidth should not fall below this figure. The Committed Information Rate in a Frame relay network is the guaranteed average total bandwidth for a virtual circuit, under normal conditions, specified by an ISP. To understand the Committed Data Rate, we first need to discuss the Committed Information Rate, or CIR. In the context of the modern network, there are two definitions of CDR that must be kept in mind: traditional Call Data Records, and Committed Data Rate. In the past, these two reports would likely draw their data from very different sources, but with the centralisation of communication technology over IP in recent years, it’s easy for this information to become entangled.

A Netflow analyser works on a similar premise: it reports on data transactions (albeit more regularly than a CDR analysis) that happen in your network environment. Traditionally, Call Detail Records (CDRs) are used for reporting on telephone calls, and specify criteria such as the source and destination numbers and the length of the call. For example, look at the use of VoIP and video call data on most networks today. As more and more of our traditional, offline transactions move into the virtual world, it’s increasingly important that network managers keep abreast of how this affects capacity planning requirements, network data and performance baselines.

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