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Committed Information Rate
The bandwidth a provider contractually guarantees to deliver, as opposed to a peak or 'up to' figure.
'Up to 100 Mbps' is a marketing number. A CIR of 100 Mbps is a promise with consequences attached. When comparing quotes, compare CIRs.
All glossary termsA free survey gets you a plain-language picture of what you have and what you actually need.