The Model 7074 General Purpose Multiplexer Card consists of eight banks of 1 x 12 multiplexers that can be configured in various combinations. Three-pole switching (HI, LO, guard) is provided for any of the 96 inputs. The Model 7074 is available with either dry or mercury-wetted reed relays. The dry-reed version (Model 7074-D) has lower thermal offset performance, while the mercury-wetted version (Model 7074-M) offers minimal contact bounce for and constant contact resistance over life. Throughout this manual, Model 7074 is used to refer to both versions unless otherwise indicated. Key features of the Model 7074 include: • Easy jumper configuration of single, dual, quad, or octal multiplexer banks. • Each of the eight multiplexer banks can be connected to the 3-pole general-purpose backplane pathways with user-installed jumpers, allowing simple internal connections to the rows of those matrix cards. • Five mass-termination receptacles located on the rear panel for quick-disconnect input and output connections