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The is the Port Note design kit for RJ11 fax/modem FXO protection. The Port Note design kit is a selection of assorted circuit protection items conveniently packaged for easy access in a plastic box with bin guide. The Port Note solutions provide protection recommendations for typical port threats. Each Port Note solutions circuit protection design kit provides a simple, single page guide with essential information to provide an effective solution known to work in most typical applications. Information provided includes objectives, part numbers, compliance, schematics and much more. In telecommunications, foreign exchange office FXO designates a telephone signalling interface that receives plain old telephone service POTS. This solution protects those interfaces against surge and power contact threats.