Committed Information Rate (CIR)

In the frame relay network the (CIR) represents the average bandwidth for a circuit that an ISP provider has under normal circumstances without any problem. In any condition or circumstances the bandwidth should not go below (CIR). Normally the bandwidth is defined in the terms of kilobytes/second.

The CIR plus excess burst rate (EIR) is always equal to or is a little less than the access point speed of the network. Usually the (CIRs) are defined differently by the frame relays and they are not adjusted so simply. They can be set up with the passage of time and gaining experience after handling different situations. The types of connections in which there are multiple types of data files being transmitted like video files and document files, so they need different speeds to be transferred with a specific speed to meet the time frequency. In this case the network has to decide which file to send first and which to send later. There are different devices that handle these situations. The frame relay assemblers and disassembles manage the connections logically and efficiently. To understand this an example is being quoted, the video files with large size and high frequency will be given more path to transfer and other files with small size will be given less space to transfer. This is managed by the (CIR), the files are sometimes also dropped due to less importance of traffic congestion and after some time they are again picked up and transmitted.

When a company takes an internet connection from a service provider according to it need than it has a fixed bandwidth. But the things are a little different in the real world other than the papers. If the user has taken a dedicated server of 256kbps, than it would not work according to the frame relay? It will work upon the principle of (CIR).