Broadband Headline Speed
The CIR defines the minimum rate that a user will experience in a shared data pipe. In practice, due to the mix of applications and their corresponding bit rate demands, as well as what the distance of a user is with respect to a radio access tower or a cabinet (fixed line), the actual speed experienced by the user will differ.
As a results, the broadband headline peak speed (instantaneous speed) is several times higher than the CIR as shown in the table below which is based on traffic simulation modelling (traffic mix of video (25%) and web browsing (75%) requiring application bit rates of 700Kbps and 150Kbps respectively). It is seen that although the estimated CIR is about 287kbps, the actual rate experience (labelled “New Mean”) is about 2 times higher and 20% of users experience around 5 times higher than the estimated CIR.