UL 864/9th Edition Listed Switches/Routers (RTR) - Ethernet Protection Boards (EPROT)
0612009
For installations requiring maximum redundancy, the RTR-1 is a fully managed switch capable of supporting Spanning Tree Protocol (STP) and Mesh Networking. STP allows the network design to include redundant links. Redundant links provide automatic backup paths (routes) to modules if an active link fails. A managed switch utilizing STP prevents the possibility of creating ‘bridge loops’ or other issues that could develop with redundant path networks. 
The RTR-2 is a cost effective lightly managed switch designed to cover most application needs.
The RTR-3 is a fiber-optic switch supporting distances up to 2 or 40 km depending on mode. 10 variations are available based on connector types, transmission method and available fiber ports.
The RTR-1, RTR-2 and RTR-3 are all UL 864/9th edition listed for use on the IPF Series fire network.