Title :
Implementation of the PCM interface for the 60-channel TMUX with MH89790
Author :
Chen, Wei ; Wang, Dejung
Author_Institution :
Beijing Univ. of Posts & Telecommun., China
Abstract :
The 60-channel TDM-FDM transmultiplexer (TMUX) provides bi-directional conversion between PCM and FDM signals. It converts one FDM standard supergroup of 60 channels, in the frequency band 312 to 552 kHz, into two PCM streams of 2048 kbit/s, each of which carries 30 speech channels. The PCM interface of the 60-channel TMUX receives two HDB3 2048 kbit/s PCM line inputs and converts them into two serial linear two´s complement format. In addition, it monitors (or transmits) PCM alarm information and detects (or inserts) signalling A, B, C and D bits. Since the functions of the PCM interface are very complex, in order to reduce the complexity, enhance the stability and the reliability of the circuit, the authors use the LSI chip MH89790 as the main chip to realize the functions of the interface
Keywords :
digital signal processing chips; frequency division multiplexing; large scale integration; multiplexing equipment; pulse-code modulation; telecommunications computing; time division multiplexing; transmultiplexing; 2048 kbit/s; 312 to 552 kHz; 60-channel; DSP chip; HDB3 line inputs; LSI chip; MH89790; PCM interface; TDM-FDM transmultiplexer; alarm information; serial linear two´s complement format; signalling bits insertion; Bidirectional control; Cyclic redundancy check codes; Digital signal processing chips; Frequency conversion; Large scale integration; Microprocessors; Phase change materials; Speech; Telecommunications; Time division multiplexing;
Conference_Titel :
Circuits and Systems, 1991. Conference Proceedings, China., 1991 International Conference on
Conference_Location :
Shenzhen
DOI :
10.1109/CICCAS.1991.184312
