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250V/AC 10A RJ45 Relay Network Ethernet Relay TCP IP Remote Controller Module 8 Channel Relay Switch for Windows System(White)Amazon$39.12
LAN Ethernet RJ45 TCP/IP WEB Remote Control Board with 4 Channels Relay UDP W5500 Networking ControllerNewegg$299.95
6-Button Control Panel Wall Plate w/ Customizable Buttons, Volume Knob, RS232, IR, TCP/IP, Relay Control, Supports PoE, and Web-Based Interface by J-Tech Digital [JTD-P6]Amazon$465.00
Algo 8201 PoE SIP IP Intercom/Doorphone with RelayAmazon$199.30
Global Caché IP2CC iTach TCP/IP to Contact Closure Converter - Connects Relay Devices to a Wired ConnectionNewegg$39.99
Dual Battery Isolator Kit, Briidea 12V 140 Amp Dual Battery Isolator Voltage Sensitive Relay, IP 65 Waterproof, for UTV ATV Boats RV's Marine Trucks Cars 5th WheelsAmazon$9.97
TCP/IP and Related Protocols : Includes IPv6, Frame Relay and ATM by Ulysses D. BlackBetter World Books$3.98
Cisco Voice-Over Frame Relay, ATM, and IP by Stephen, Foy, Stephen, McGrew, Kelly McQuerryBetter World Books$13.99
Fundamentos de las Redes de Datos Digitales: X.25, Frame Relay, Ethernet, TCP/IP (TECNOLOGÍA) (Spanish Edition)Amazon$6.74
Converged Network Architectures : Delivering Voice over IP, ATM, and Frame Relay by Oliver C. IbeBetter World Books$49.99
Mata1 Dual Battery Isolator Kit 12V 140Amp IP-67 Waterproof Rating VSR (Voltage Sensitive Relay) Smart Car Charger for All Automotive Land or Marine VehiclesAmazon