Rhino Failover Card

The Rhino single port analog and digital failover is a self-contained, actively controlled, redundant switch with one input and two outputs (A-B). The failover card utilizes a powerful microcontroller that selects one of the two outputs depending on the condition of the main Asterisk server. The failover uses a loadable Asterisk module (.so) which communicates with the microcontroller by regularly sending an “OK” (watchdog) signal when Asterisk is running. When that “OK” is not received, normally when Asterisk fails, the microcontroller automatically switches ports to the failover device after a user defined duration. If the PC reset feature is enabled (it must be user enabled to operate in this mode), the PC will be reset. In addition, when power fails (USB power) the card automatically switches to the failover port.

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1-Port Failover Standard Features

•Asterisk soft PBX tested
•Two parallel USB connectors: one internal to motherboard, or external using type B USB female connector

•Two-pin male header and cable to connect the failover card to the PC reset header pins on the motherboard
•One input (port 1) - RJ11, RJ45 or RJ48 (all 8 wires passed to all ports) switched to either the A (normal, port 3) or B (failover, port 4) position
•One T1/E1 digital passive monitor port (port 2) that connects pins 1-2 and 3-4 from the input port (port 1), to port 2 through four series 470 ohm resistors
•For FXO-FXS channels, one, two, three (or four using a RJ45) lines can be switched using all 6 wires in a RJ11
•Software programmable watchdog timer allows for setting the max time between watchdog pings from the server
•Fits into a single PCI slot at the chassis, no PCI electrical bus connection needed


Analog Mode

In analog mode, the Rhino single port failover allows for the connection of one, two or three telco FXO lines (6 wires in an RJ11, or four lines in a RJ45 if specially terminated) between Rhino FXO ports and single line telephones. In the case of failure, the Rhino single port failover will connect FXO lines to the single line telephones, allowing for both incoming and outgoing calls to be handled on the single line telephones until the server can be brought back on-line.

Digital Mode

In digital mode, either an Ethernet or a T1/E1/J1 line can be switched, since all eight wires are routed straight through on the failover card to either the A or B port. In addition, in T1/E1/J1 mode, port 2 of the failover card is designed to be used with digital monitoring systems, with wires 1-2 and 4-5 connected from port 1 to port 2 through four 470 ohm resistors.