Transmultiplexers: Current Trends

Abstract

With the increasing introduction of digital communication equipment within the existing analogue communication network and the consequent requirement of interconnecting the two, the need for conversion or translation between TDM/FDM and vice-versa is growing.

Transmultiplexing (TMX) or the process of translation between FDM and TDM offers interesting application possibilities. The paper defines the Transmultiplex problem, describes the basic methods of Transmultiplexing and the details of design considerations of a 120-channeI TMX system.

The paper concludes with a review of the present trends in TMX, like the use of multistage structure of digital filters, development of LSI circuits with single chip arithmetic processor with multiplier capability, the NEC made VLSI (16 bit pipe-line multiplier (MPL)) which can realise any digital signal processor etc.

Additional information

Notes on contributors

C. Rao Kasarabada

Chalapathirao, Kasarabada (Dr): Received the BSc Degree from Andhra University, Andhra, India in 1962, BE Degree from IISc, Bangalore in 1965, and ME Degree from BITS, Pilani, in 1967. He received the MS and PhD Degrees in 1970 and 1974 respectively from the University of Minnesota, Minneapolis He taught Post Graduate Courses in Digital Logic System Design, Hardware Organisation and Design of Digital, Fault Dectection in Digital System and in the Department of Electrical Engineering, University of Vermont, Burlington, during 1974–75. He was also associated with the IBM LSI Institute during this period. From August 1975 to August 1977 he served as a Senior Engineer in the Research & Development Section of Eastern Electronics Ltd., Faridabad, involved in the design and development of Digital Instrumentation. From August 1977 till July 1980 he worked as a Senior Chief Engineer in R&D Division of ITI Ltd. From July 1980 till June 1981 he worked as Chief Engineer (R&D). Since June 1981 he is heading the R&D Unit at Naini as Deputy General Manager (R&D).

His areas of interest are Hardware Organisation on Design of Digital Systems, Signal Processing, Computer Aided Design, Micro-electronics and Reliability. He has publications in the areas of circuits, controls and communication and computers.