Multi-processor multi-channel PCM test system

The design and development of a pulse code modulated (PCM) test system are described. For real-time signaling analysis, a TMS320C25 digital signal processor (DSP)-based card is designed to interface with the IBM PC input/output (I/O) channel. This card is designed for multichannel signal analysis and an associated software is written for multifrequency compelled (MFC) digital analysis. A chip set from Mitel is also used to interface to the 30-channel PCM (2048 kb/s) system. This card is designed to cater for clock extraction and regeneration from the PCM data, synchronization checks, time-slot selection and the extraction of signaling data which is then passed to the PC via dual-port RAMs. An onboard 80188 microprocessor is also incorporated in the design to act as a front-end processor and to initialize and control the PCM interface. Test results show that the prototype functions as expected. >