[IEEE TENCON '97 Brisbane - Australia IEEE TENCON '97 IEEE Region 10 Annual Conference. Speech and Image Technologies for Computing and Telecommunications - Brisbane, Qld., Australia (2-4 Dec. 1997)] TENCON '97 Brisbane - Australia. Proceedings of IEEE TENCON '97. IEEE Region 10 Annual Conference. Speech and Image Technologies for Computing and Telecommunications (Cat. No.97CH36162) - Design of TU-11/TU-12 level switching structure in optical transmission equipment which supports SDH (synchronous digital hierarchy) standard