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Note: This section is out of date and no longer maintained.
It is retained for the value of any residual information contained in it. CIRCommitted information rate. This is a number that your provider will guarantee as a minimum level of service at any time. For example, you have a state of the art top speed 7mbps ADSL connection. And your CIR is 128k. Are you happy? not really.. because unless you can prove your link runs slower than 128k, you have no right to complain. Of course the link may burst up to 7mbps, when the network is not busy, but the CIR means the provider does not go out of business trying to maintain that to all users simultaneously when www.microsoft.com announces that it will be paying Cindy Crawford to strip on streaming video for free viewing, as a way of building visitors to the MSN network.
If your provider does not tell you what the CIR is, it is probably because they haven't decided it yet, and will publish it later, when it is too late to change your mind. See also SLA.
At the moment, it would be fair to comment that residential DSL is provided on a best effort basis. This means there are no guarantees.
SLAService Level Agreement. This describes in general the minimum quality of service the provider is committed to provide in return for your bucks. In an SLA should be something about the CIR, as well as passages on response time in case of problems, and other details basically telling you what minimum you are agreeing to accept. If you don't have an SLA that you can find, then unfortunately, the minimum service level you must accept is pretty near zero. (best-effort service).
With the number of parties involved in a DSL installation, it is unlikely an SLA will cover all of them, and each will certainly be covering their own back for problems they might say originate from one of the other companies.
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