The BLS-148H is a plug-in bi-level multiplexer card for use in TTC EDAU/CDAU/WDAU data acquisition system products. Operation in the WDAU, wide-band system, can occur at bit rate speeds up to 20 Mbit/sec. The card is intended for applications that require detection of logic levels, switch status, or other “on/off” signal types. Threshold levels are user-programmable to accommodate a wide range of inputs. Bilevel data is encoded for transmission in the system PCM output format. The card has 3 data trigger/latch modes and the capability for timestamping discrete data inputs. These features result in a high-performance discrete card for interfacing with a wide variety of digital subsystems.