AJAX ReX

Several ReX extends security systems’ radio coverage area up to 45 km². At the same time, the transmission alarm signal to the hub takes no longer than 0.3 seconds. The range extender can be placed at a distance of up to 1,800 meters from the hub (Rex is compatible with all Ajax hubs), providing stable two-way communication with detectors, sirens, power supply control devices, keyboards and key fobs that are assigned to its network.

With its design and hardware, ReX is very much like Hub, but without the Ethernet and GSM modules—they are unnecessary for a range extender working within the Ajax network. In the standard operation mode, the device is powered from the electrical grid of the premises, and in the event of a power outage, it is powered by the built-in backup battery. ReX boasts an outstanding battery life of up to 35 hours.

ReX is run by the real-time operating system OS Malevich. These types of systems are used in ballistic missiles, elevators and car brakes, as they are particularly failure-proof. OS Malevich combines functionality and security: it boasts frequency jamming, is virus-resistant, and authenticates devices.

Rex uses the new radio protocol Cargo for communication with the Hub. It works over the Jeweller radio technology, providing packet transmission of compressed and encrypted information about the status of the security system at frequencies of 868.0–868.6 MHz. Since it has access to what the hub knows thanks to Cargo, the range extender does not wait for the control panel to make a decision about arming/disarming the devices entrusted to it, turning on/off the relay according to scenarios, or activating sirens when there’s an alarm. In emergencies, it manages the Ajax autonomous subsystem.

If the connection with the hub is lost for whatever reason, ReX will assume the role of the control panel: in the event of an alarm, it activates the sirens.

Another advantage of Cargo is the ability to transmit firmware files over the Jeweller network. ReX is the first Ajax device that updates software over the air without a direct connection to the internet. Similarly to hubs, the range extender will regularly receive new OS Malevich versions, optimizing performance and expanding device capabilities.