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The FXO port is used to connect to PBX or key systems, or to provide off-premises connections to the public switched telephone network (PSTN). It supports battery reversal detection and caller ID. This VIC can be software configured to work in all countries. lt is also used to connect to analog Centralized Automatic Message Accounting (CAMA) trunks to provide dedicated E-911 service (North America only).
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 Number : NIM-4FXO=
UPC : 00882658634451