Definition

call failure rate (CFR)

The call failure rate (CFR) is the percentage of calls to an ISP or any network provider that fail to get through. The CFR is commonly used as a statistical measure in assessing Internet service providers. Companies can also measure the CFR for their own employees who dial in for access to the company's network. Rating companies report on the CFRs for major ISPs like AOL, Ameritech and Mindspring. Visual Networks, formerly Inverse Network Technology, is one the best known benchmarking company of ISPs.

Related glossary terms: akamaize, maximum transmission unit (MTU), CRC-4 (Cyclic Redundancy Check 4), Usenet, Source Quench Introduced Delay (SQuID), network analyzer (protocol analyzer or packet analyzer), jabber (in networks), phase-change cooling (vapor cooling), maximum segment size (MSS), network operations center (NOC)

This was last updated in August 2006

Posted by: Margaret Rouse

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- Visual Networks provides a benchmarking product that includes CFR measurement .

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