The MBLS-132-1 is a 32-channel bi-level (on/off) multiplexer module for use in the MEDAU/MCDAU/MWDAU-2000 series products. The module is compatible with stack operation of up to 20 Megabits/second. It can accept single-ended voltages from discrete devices such as switches or relays, or logic levels from digital devices, and encode these levels into data words for transmission in the system PCM output format. All inputs must be referenced to AGND on the module. A DC threshold voltage level is programmable in TTCWare on an 8-bit basis between –10.24 volts and +10.24 volts. This threshold level determines the transition point from logic 0 to logic 1. Open-input behavior (pull-up or pull-down) is also programmable in TTCWare on an 8-bit basis. Two groups of 16 input channels each are formatted as words and sent to data latches whose operation is also programmable through TTCWare. The latch data is then made available for transmission in the PCM output format.