The Resideo LTEM-PIA is a dual-path communicator. It uses the AT&T LTE Cat-M1 cellular network and offers an ethernet connection port, which allows the user to take advantage of an existing internet connection. Its most distinguishing feature is the fact that it is UL-985 Listed for Residential Fire.
Resideo already has a couple of communicators that are dual-path capable and designed to use the AT&T or Verizon LTE Cat-M1 network. They are the Resideo LTEM-PA and Resideo LTEM-PV respectively. However, due in part to their modular design and support for WIFI communication, those devices do not carry the UL-985 Listing for Residential Fire. If you are designing a system that needs to carry the UL-985 listing, then you want to include the Resideo LTEM-PIA.
The AT&T LTE Cat-M1 network is the segment of the LTE network that was created specifically for IoT (Internet of Things) use. It has lower bandwidth capabilities as compared to the primary LTE network. However, the amount of data transmitted in alarm signaling is so small that the LTE Cat-M1 network can handle it with ease with no discernible difference to the end-user.
For Resideo communicators that support dual-path communication, the communicator will always use the internet (primary) path when it is available. It verifies this availability every few seconds by sending a communication packet to the AlarmNet server. If it doesn't receive an acknowledgment of this transmission, it knows to switch to the cellular communicator (secondary path).
The UL-985 Listing for Residential Fire does not preclude the Resideo LTEM-PIA from supporting Total Connect 2.0. That means that although it can't support the PROWIFI or PROWIFIZW module, it can still be used for remote interactive services provided by AlarmNet. With Total Connect 2.0 a user can remotely check the status of their system, arm or disarm, control automation devices, create automation scenes, and receive notifications. All from an app or website, from any location with a connection to the internet available.