Showing papers on "Banyan switch published in 2005"

Optical switch fabric with redundancy

Abstract: An optical switch fabric with an input stage, an output stage, and a center stage coupled in a cascaded manner. The center stage includes (1) a minimum number of center switches greater than one that cause the optical switch fabric to be strict-sense nonblocking and (2) at least one additional center switch to provide redundancy for the optical switch fabric. A module is described that includes optical input and output switches coupled to an optical center stage of an optical switch fabric. The module includes an interior cavity that contains free space beams from both the optical input switch and the optical output switch. A method is described for reconfiguring a redundant optical switch into a multilevel optical switch without interrupting operation of the signals carried by the optical switch by adding additional switch components and reconfiguring the fiber interconnection between switch elements.

TrueWay: a highly scalable multi-plane multi-stage buffered packet switch

Abstract: Packet switches have been extensively studied during the last two decades. Most commercially available packet switches have a single path between input and output ports, which limits the scalability of the switch. In order to accommodate the exponentially increasing demand of Internet traffic, we propose an ultra scalable multi-path switch architecture, called TrueWay, a multi-plane multi-stage buffered switch. Packets are delivered between the stages of switch modules with link-to-link flow control to avoid overflowing the next-stage's buffers. Schemes such as back-pressure, credit-based and our proposed DQ scheme are discussed. One of the challenging issues of multi-path buffered switch is the maintenance of packet orders that can be resolved by appropriate port-to-port flow control. Schemes such as static hashing, time-stamp-based re-sequencing, dynamic hashing, and window-based re-sequencing, are considered. We show by simulation that the TrueWay switch with a speed up of 1.6 is able to perform nearly as well as the output buffered switch under most interested traffic distributions. A small-scale prototyped switch fabric has been built on a 16-card chassis with high-speed SerDes interconnections at the backplane (with 640 Gbps capacity), and with FPGA chips on each card to reconfigure the switch to test various stage-to-stage and port-to-port flow control schemes. With today's ASIC technology, e.g., 64/spl times/64 switch chip with SerDes interfaces and VCSEL (vertical cavity surface emitting laser) optical interconnections, the TrueWay switch can scale up to 40 Tbps.

Core Switch Architectures for the Agile All-Photonic Network: Performance Evaluation with Crosstalk

Abstract: The aim of this work is to analyze, evaluate, and compare the technological and architectural options to implement the core switches of the Agile All-Photonic Network (AAPN). The required core switch functionality and switch scales are discussed. Three technological choices, Electro-optics, SOA optical gates, and TWC with AWG are considered. The major performance impairment in optical switches, the in-band crosstalk, is analyzed using a statistical model to evaluate and compare its impact up on the scaling of the switch fabrics. The switch element crosstalk requirement is estimated as a function of switch dimension and a suitable technology option that is realistic for various switch capacities is presented.

RF Switch and its Applications in Communication Systems

Abstract: Discusses the RF switches in communication Systems. Summarizes the bandwidth, insertion loss, isolation, power capacety, speed, VSWR, power consumption, life, size and other performance of RF switch. Discusses the function mechanisms, the targets, the advantages and the disadvantages of ferrite switch, solid swich(PIN switch and FET switch) and MEMS switch. Compare several types of switches in table. Introduce the application of switch matrix on future wireless communication systems in brief. Point out the factors need to be noticed in switch design. Introduce the directions of RF switches.

Reliable Switching Architecture for High Speed Networks

Abstract: Due to the advancement in the field of computer technology, communication and the increasing user's demand in terms of bandwidth and speed, the future communication network is rolling towards the BISDN with optical technology. The high speed ATM network is one of the major tools used for BISDN. This BISDN services are expected by the users not only from the wired network but also from the wireless network. In turn, the efficiency of the ATM network relies on the switching fabric. Hence, the switching fabric of future telecommunication systems should have a very low cell loss and delay performance in both the networks. In this paper, the results of the simulation of Banyan switch network and the results of the implementation of the switch fabric onto the FPGA chip XCS20 are presented. Also, the applicability for the switch fabric for high speed requirement has been discussed.

An optical switch array with 750-µs switch time

Abstract: A novel design of micromachining-based high speed 1x2 optical switch array is presented. Employing a triangle-shaped micromachined mirror for beam directing, the design achieved a high level integration of multiple switches on a single substrate, significantly shortened switch time to below 1 ms. An array of four 1x2 switches was fabricated and the performance of the switch array prototype was reported, attaining a fast switch time of less than 750us, extremely low cross-talk 3 . The experimental result was compared with that from a finite element analysis and a good agreement was obtained.