The R850 appliance provides failover capabilities for digital (T1, E1, J1, PRI, BRI) circuits. Lines from the telephone company are terminated to the R850, which then delivers service to Digium interface ports on the active server. In the event of a hardware or software fault on primary, the R850 redirects all circuits to the backup. Control signaling is handled via USB ports which also provide power to the R850, saving energy over the lifetime of the appliance.

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