We are using an ethernet AB switch that allows you to switch all eight conductors of tbe cat5/6/7 cable simultaneously. These switches are used in data centers for network fail over. There are manual versions such as the ones he and I are using and RS-232 versions that can automate things nicely.

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#1 Trinnov Altitude 32-8-16, 271, 8000XE, 7200SEHC, 7200.2, Seaton F18, JL Fathom F113, Revel w990's, Kef R7, ATI 528 Amp, JVC RS4100K, SI screen. Roon Nucleus+, Eno AG, Eno M link, 218.
#2 Mark Levinson No5105, Ayre VX8 and CX8, Vandersteen Treo CT, Preamp varies.
#3 Meridian Ellipse