Digital Interface Code Converter.
Abstract
The design, development, fabrication, and testing of one exploratory development model of the Digital Interface Code Converter was completed. The code converter interfaces two PCM multiplexers which utilize different companding characteristics, bit rates, synchronization code formats, and signalling formats. The AACOMS TD-352 and TD-660 tactical multiplexers which use a 6-bit quantized, 3 segment companded PCM format are digitally interfaced to the strategic TD-968 multiplexer which uses an 8-bit quantized, 15 segment companded PCM format. Conversions between the tactical in-band tone signalling format and the strategic E and M signalling format are made by the code converter. The current interface is on a serial 12-channel basis and a design plan has been developed for implementation of a 24-channel interface using TD-204 or TD-754 combiners. Rate conversion is performed via frequency multiplying phase locked loops, frame synchronization is established, a mapping between the 2 codes is performed via Read-Only memories, and signalling information conversion is performed via a phase locked loop tone detector and a digital tone generator. The mapping optimizes performance in the areas of signal-to-idle channel noise ratio, signal-to-quantizing noise ratio, and input-output linearity. Proper operation has been demonstrated with TD-352 and TD-968 multiplexers.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1973
- Accession Number
- AD0908524
Entities
People
- Feather A. Staudt
- William H. Moore
- William L. Betts