T/E-Carrier Systems

Mr. Junyan Bei

Senior DSP Software Engineer
Legerity, Austin

Friday, September 20th, 3:00 PM, ENS 637

Abstract

T/E-carrier systems refer to a set of Time Division Multiplexing (TDM) -based digital hierarchy defined by the International Telecommunication Union (ITU). With maximum data rate up to 274 Mbps, T/E-carrier systems play an important role as the high-speed backbone in the Public Switched Telephone Network (PSTN) and Local Area Networks (LAN). Within the PSTN, T/E-carrier systems are channelized into many 64 Kbps time slots based on digital signal level 0. For LANs, T/E-carrier systems provide transmission links at a particular digital speed defined in the digital hierarchy.

Starting with the concept of carrier systems, we will briefly review the evolution of the carrier systems employed in the PSTN. This presentation will then focus on the hierarchy structure of T/E-carrier systems, the baseband line coding, framing structures and intra-office signaling with emphasis on T-1 and E-1 carrier systems. The arrangement of T-1/E-1 carrier systems to transmit Asynchronous Transfer Mode (ATM) cells for voice applications will also be briefly discussed.

Biography

Mr. Junyan Bei completed his Masters in Electrical Engineering, and Bachelors in Computer Science in 1997 and 1995, respectively, from the University of Maryland, College Park. He is a senior DSP engineer at Legerity, Austin from Jan. 2001. He has also worked as a DSP engineer at 3Com corporation. His research interest include digital signal processing, wireless communications technologies, optical fiber communication systems, and digital communication and coding techniques.

A list of Wireless Networking and Communications Seminars is available at from the ECE department Web pages under "Seminars". The Web address for the Wireless Networking and Communications Seminars is http://signal.ece.utexas.edu/seminars