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The BLS-148H is a plug-in bi-level multiplexer card for use in TTC’s EDAU/CDAU/WDAU 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.

Key Features

  • 48 channels per card (four 12 bit words)
  • Programmable input threshold
  • +10V to -10V on a word basis
  • Programmable floating input detect “0”/“1” on a word basis
  • Programmable input trigger modes
  • Sample based on PCM format
  • Sample based on system’s simultaneous sample pulse
  • Sample based on minor frame
  • Sample based on major frame


  • Computers I/F via parallel digital I/O
  • Monitor BCD-compatible equipment
  • I/F with parallel time code
  • Switch/relay status monitoring
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