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Home | Seminars and Symposia | Past seminars/symposia: Thursday, May 2, 2002

DTC Seminar Series

Satisfying the Requirements of Applications on a Single Packet Network


Yoram Ofek
Synchrodyne Networks, Inc.

Thursday, May 2, 2002
10:00 am

402 Walter Library

Slide presentation (powerpoint 559 KB) Slide presentation (pdf 783 KB) Over the past few decades, it has become clear that there is a need for a transition to a single packet network that can support all applications, and in particular can replace the existing circuit switching network (which supports telephony). However, challenges remain in realizing the above. One of the major challenges is how to satisfy new interactive streaming media applications (which I call "person-to-person communications"). Another challenge is how to effectively satisfy distributed computing with bursty data sources (which I call "machine-to-machine communications"). We will present novel solutions which introduce two new elements: (1) using virtual ring embeddings for convergence routing in order to improve machine-to-machine communications, and (2) utilizing Coordinated Universal Time (UTC a.k.a. GMT) for pipeline forwarding of data in order to: (i) improve person-to-person communications — while transporting unchanged TCP/IP "Best Effort" traffic, and (ii) realize an all optical fractional lambda switching.


Dr. Ofek is the founder, President and CTO of Synchrodyne Networks, Inc., which has been focused on developing various switching and transport technologies for the Internet. In Synchrodyne Dr. Ofek's responsibilities include technological innovations and funding. He received his B.Sc. degree in electrical engineering from the Technion-Israel Institute of Technology in 1979, and his M.Sc. and Ph.D. degrees in electrical engineering from the University of Illinois-Urbana in 1985 and 1987, respectively. From 1979 to 1982 he was a research engineer at RAFAEL, Haifa, Israel. From 1983 to 1984 he was at Fermi National Accelerator Laboratory, Batavia, Illinois, and from 1984 to 1986 he was with Gould Electronics, Urbana, Illinois. From 1987 to 1998 he was a research scientist at IBM T. J. Watson Research Center, Yorktown Heights, New York. For his invention of the MetaRing and his contributions to the SSA storage products (multi-billion dollar business for IBM) Dr. Ofek was awarded the IBM Outstanding Innovation Award. He wrote 33 US patents and 90 journal and conference papers. Dr. Ofek has initiated, invented, and managed the research activities of five novel network architectures: (1) Ring networks with spatial bandwidth reuse with a family of fairness algorithms, MetaRing, which is used as the underlying network for SSA (Serial Storage Architecture — ANSI Standard X3T10) and several IBM products. (2) Optical hypergraph for combining multiple passive optical stars with novel conservative code for bit synchronization, pseudo-isochronous flow control, and global clock synchronization techniques. (3) Embedding of virtual rings in arbitrary topology network, the MetaNet — for bursty data traffic with no packet loss, fairness and reliable/real-time broadcast/multicast. (4) Global packet networks for real-time and multimedia, which utilize Coordinated Universal Time (UTC a.k.a. GMT) for providing deterministic quality of service (QoS) guarantees. (5) All optical fractional lambda (wavelength) switching for WDM networks. Dr. Ofek's current activities focus on optical networking and using UTC in firewalls and mobile and wireless networks.