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{{Short description|Metric for digital communication link}}
In [[telecommunications]] and [[data communication]] systems, an '''errored second''' is an interval of a [[second]] during which any error whatsoever has occurred, regardless of whether that error was a single bit error or a complete loss of communication for that entire second. The type of error is not important for the purpose of counting errored seconds.
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More specialist and precise definitions of errored seconds exist in standards such as the [[Digital Signal 1|T1]] and [[Digital Signal 1|DS1]] transport systems.
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* [http://www.cisco.com/en/US/tech/tk713/tk628/technologies_tech_note09186a00800f2fa1.shtml Cisco DS1, T1 and E1 Glossary]
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