TRICON 3503E 24 Volt AC/DC Digital Input Module

The main functions of the switch: including physical addressing, network topology, error checking, frame sequence and flow control. When the destination address of a data frame is mapped in the MAC address table, it is forwarded to the port connected to the destination node but to all ports (if the data frame is a broadcast/multicast frame, all ports are forwarded). When the switch includes a redundant loop, the Ethernet switch avoids the loop through the spanning tree protocol, while allowing the existence of a backup path. When the destination address of a data frame is mapped in the MAC address table, it is forwarded to the port adjacent to the destination node but to all ports (if the data frame is a broadcast/multicast frame, all ports are forwarded).

The surface of the switch shell and exposed parts (terminal buttons, panels, switches, etc.) should be clean and intact, and the nameplate should be clear.

The appearance is good, the interface cable is intact, all parts are well fastened, and the numbers on the screen are normal. All parts should be clean, dust-free, intact, without rust or deformation.