Arrays of mesoscopic palladium wires prepared by electrodeposition form the basis for hydrogen sensors and hydrogen-actuated switches that exhibit a response time ranging from 20 ms to 5 s, depending on the hydrogen concentration. These devices were constructed by electrodepositing palladium mesowires on a highly oriented pyrolytic graphite surface and then transferring these mesowires to a cya...

One of the major issues in the networking industry today is the tremendous demand for more and more bandwidth. With the development of all-optical networks and the use of Dense Wavelength Division Multiplexing (DWDM) technology, a new and probably very crucial milestone is being reached in network evolution. In this scenario, carriers need powerful, commercially viable and scalable tools that c...

We describe a novel method for scheduling highspeed network switches. The targeted architecture is an input-buffered switch with a non-blocking switch fabric. The input buffers are organized as virtual output queues to avoid head-of-line blocking. The task of the scheduler is to decide when the input ports can forward packets from the virtual output queues to the corresponding output ports. Our...

In recent years, parallel computer systems are being increasingly used in multi-user environments, with several users sharing the interconnection network at the same time. As a result a large number frequently contend for link bandwidth at the core switches in the network. Traditional fair scheduling disciplines need to maintain per-flow states and perform packet scheduling on a per-flow basis,...

Most of today’s high-speed switches and routers adopt an input-queued crossbar switch architecture. Such a switch needs to compute a matching (crossbar schedule) between the input ports and output ports during each switching cycle (time slot). A key research challenge in designing large (in number of input/output ports N) input-queued crossbar switches is to develop crossbar scheduling algorith...

High speed analog-to-digital converters capable of digitizing signals with bandwidths of several tens of GHz have applications in high-speed instrumentation, wideband radar and optical communications. However, the design of converters with such high input bandwidths is constrained by the need for wideband sample-and-hold circuits with sufficiently low clock jitter. A number of photonic sampling...

Shared memory is commonly used to build output queued (OQ) switches. An OQ switch is known to maximize throughput, minimize delay and can offer QoS guarantees. However it is generally believed that high capacity switches cannot be built from shared memory switches because the requirements on the memory size, memory bandwidth and memory access time increase linearly with the line rate and the nu...

Today, with the proliferation of switch-based local area network standards, such as ATM (Asynchronous Transfer Mode), HIPPI (HIgh Performance Parallel Interface) and Fibre Channel, the issue of the eecient interconnection among connection-oriented switches arises. This paper presents a study of eecient arrangements of switches intended to support a local area network environment. This multi-swi...

The design of RF MEMS switches involves several disciplines: mechanics, materials science and electrical engineering. While significant progress has been made in the RF design of the switches, mechanical and material studies are required for mass commercialization of reliable devices. Senturia and co-workers at MIT have presented a closed form solution to describe the electromechanical behavior...