The 8x8 X-Y control panels can either be used as local or remote control panels. When used as a remote control panel the optional cradle assembly, model CR100, with built in 115V/230V input power supply and Ethernet interface should be ordered. With a single bus panel, a DIP switch in the remote panel cradle selects the output that is controlled by that particular single bus panel. The simple to install coax based 10Base2 Ethernet network can support up to 32 panels and a total cable length of 300 feet. For longer distances and/or more panels, standard Ethernet LAN 'Hub' units can be used to expand the panel network to 256 panels. Operation as an X-Y panel is straightforward. First the desired destination (output) is selected. Once the output is selected, the source (input) buttons will tally and they are used to select the desired input to that destination. Outputs that have been 'locked' are indicated by the output lamp flashing when a locked output is selected. The CP818A and CP818B panels, as illustrated, use a common set of switches for both audio and video (AFV) The CP818A is used with either the XL818A or XL818C routers. The CP818B, which adds the Video and Audio breakaway pushbuttons,is designed primarily for the XL818C.