The ELK-AEXCELLA Alarm Engine Cellular Communicator enables Alarm Engine controls to communicate with a Central Station and provides a pathway for system communication via the AT&T LTE cellular network. It connects to the RS-485 data bus, with activation and setup managed through the ElkConnect portal. If the IP pathway becomes unavailable, the E27 control automatically communicates over the cellular pathway provided by the AEXCELLA. The AEXCELLA requires an E27 with an active subscription in ElkConnect, specifically, an IP Interactive with Cellular plan. The IP Interactive with Cellular plan is available at the same flat rate as the IP Interactive plan, with no added cell costs!