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The FXS port is used to connect directly to phones, fax machines, and key systems. It generates battery polarity reversal and caller ID. The FXS NIMs are designated as an Off-Premises Extension Lite product offerings. This means that while the module addresses a subset of the off-premises extension applications, it should be noted that the module is not in full compliance for off-premises use.
The FXS, FXO, E/M, and BRI NIMs can be inserted into the NIM slot on the supported Cisco 4000 Series ISRs without powering off the router.
Compatibility : Cisco 4451-X, 4451-X Application Experience, 4451-X Integrated Services Router, 4451-X Integrated Services Router Security Bundle, 4451-X Integrated Services Router Voice and Video Bundle, 4451-X Integrated Services Router Voice Security Bundle
Cisco Part Numbers : NIM-4FXS, NIM-4FXS=
UPC : 00882658634451