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In the following table, a indicates that a single switcher is capable of providing a matrix of the size given with the number of layers shown on the left. Two indicates that a switcher of this size and number of layers can be made from two linked units, with a single control path from front panel or via the serial remote control port. There's a brief overview below, or you can download the VX-8500 spec sheet . Front panel pushbutton selection of audio and video inputs and serial RS232 control from a computer are provided as standard, and a serial remote control panel is available as an optional extra. If you wish to link 2 or more switchers together to provide additional levels, then either of the serial control options can be used to provide a single point of control.