The ES-1 is an Ethernet manual A/B Switch for 10/100 RJ45 connectivity. There is an LED for the active port and a simple toggle switch to toggle from port (A) to port (B) and vice versa. It utilizes a series of electronic continuity relay switches and does not read or generate any signals.
Buy es-1 --ethernet 10/100 manual а/в switch
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in section "Switchboards"