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This is an old revision of this page, as edited by SmackBot (talk | contribs) at 03:39, 29 November 2009 (Date maintenance tags and general fixes). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

The topic of this article may not meet Misplaced Pages's general notability guideline. Please help to demonstrate the notability of the topic by citing reliable secondary sources that are independent of the topic and provide significant coverage of it beyond a mere trivial mention. If notability cannot be shown, the article is likely to be merged, redirected, or deleted. Find sources: "ANSI C12.21" – news · newspapers · books · scholar · JSTOR (November 2009) (Learn how and when to remove this message)

ANSI C12.21 is the American National Standard for Protocol Specification for Telephone Modem Communication.

External links

• The ANSI C12.21 standard at NEMA

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