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U.S. Patent: 5278548 - Buffered feedthrough crossbar switch - January 11, 1994 An improved crossbar switch in which internal buffering is performed for input signals across the chip and in which an extra input for each output channel of the crossbar switch element is provided. This is accomplished by the present invention by a basic crossbar switch element which is capable of buffering each signal input to provide a buffered input to the switch element multiplexer array and which also provides a buffered feedthrough of the input signal to a separate output terminal of the switch element. An object of the invention is to provide a basic crossbar switch element which buffers each data input to furnish a buffered data input to the crossbar switch element multiplexer array and a buffered feedthrough of the input data to a separate buffered data output terminal of the switch element. www.everypatent.com /comp/pat5278548.html   (2738 words)

Crossbar switch - Wikipedia, the free encyclopedia Crossbar switches have a characteristic matrix of switches between the inputs to the switch and the output of the switch. Crossbar switches are most famously used in information processing applications such as telephony and packet switching, but they are also used in applications such as mechanical sorting machines with multiple inputs. As computer technologies have improved, crossbar switches have found uses in systems such as the multistage interconnection networks that connect the various processing units in a uniform memory access parallel processor to the array of memory elements. en.wikipedia.org /wiki/Crossbar_switch   (1733 words)

Telephone World - Western Electric Crossbar Telephone Switching Systems Crossbar telephone switching systems were developed by LM Ericsson of Sweden in the 1930s. The concept of the crossbar is the crossbar mechanism operates on a matrix concept where dialed digits would change the position of the crossbar and connect to other parts of the matrix. The first installation of a #5 Crossbar was on July 11, 1948 in Media, PA.The #5 Crossbar became the “bread and butter” telephone switch of a growing nation in the 1950s and 1960s. www.dmine.com /phworld/switch/wexbar.htm   (836 words)

Nick Mckeown's paper Crossbar switches are widely used for switched backplanes because of their simplicity. A crossbar switch is shown in Figure 4; by closing several crosspoints at the same time, the switch can transfer packets between multiple ports simultaneously. It considers all the packets waiting to be transferred across the switch fabric and selects a configuration of the crossbar, ensuring that at any one instance each input is connected to at most one output, and that each output is connected to at most one input. www-2.cs.cmu.edu /~srini/15-744/F02/readings/McK97.html   (6446 words)

EETimes.com - Flexible I/O speeds data switch   (Site not responding. Last check: 2007-10-30) The core of a network switch or router is the switching fabric, for which many alternatives have been proposed-from simple shared buses to complex multistage networks. In the basic architecture of an N x N crossbar enhanced using this proposed technique, each traffic source (destination) is connected to more than one input or output port of the crossbar through lightweight, configurable hardware layers. If we define the utilization of the crossbar as the percentage of the maximum switching capacity that is used, we use the maximum possible data transfers. www.eetimes.com /in_focus/mixed_signals/OEG20020510S0067   (1085 words)

Tag » Crossbar   (Site not responding. Last check: 2007-10-30) A crossbar switch is one of the principal architectures used to construct... Crossbar switches are sometimes referred to as "cross-point switches" or "... Crossbar is an open source framework for web-based reporting applications. ummyeah.com /tag/crossbar   (315 words)

Intel® Express Gigabit Switch - Features Overview The crossbar switch fabric provides low latency, high throughput packet switching using a crossbar architecture. Crossbars are inherently more scalable than shared memory architectures. Single copy replication: When possible, input frames destined for multiple switch ports pass through the crossbar only once and are copied by the crossbar to each destination. www.intel.com /support/express/switches/1gb/sb/cs-011060.htm   (552 words)

NxN Optical crossbar switch matrix (US5255332) An optical crossbar switch matrix for use in switching optical signals from a first set of optical fibers to a second set of optical fibers, in any order, which is characterized by having a matrix of rows and columns of diffraction gratings formed in a semiconductor heterostructure. Each grating is independently biased with either a forward or reverse bias voltage to switch the grating between a reflective state and a transmissive state. The gratings are oriented at an angle relative to the rows and columns so that when the Bragg condition for the light received from an optical film is met, a portion of the light is diffracted from the row in which it is propagating into a column toward another optical fiber. www.delphion.com /details?pn10=US05255332   (311 words)

Untitled Document The Prestera-FX9210 crossbar switch fabric is a 12-port switch fabric that integrates 72 SERDES ports running at 3.125 Gbps, providing a net bandwidth of 360 Gbps through the fabric. The Prestera-FX9110 crossbar switch fabric is a 9-port switch fabric that integrates 54 SERDES ports running at 3.125 Gbps, providing a net bandwidth of 270 Gbps through the fabric. Prestera is a versatile switching solution that Marvell has applied with equal success to chip sets for the workgroup, enterprise, and metro markets, but until now there has only been a limited amount of expansion possible using the FX series of switch fabric adapters. www.analogzone.com /netp0106.htm   (1215 words)

PROJECT: Crossbar The Crossbar is an effects signal switcher which uses a special circuit called a crossbar switch to route signals from a guitar, through up to 7 out of 8 possible effects loops, IN ANY ORDER, and finally out to the amp. The key idea is that a rotary switch switches one input wire to the input of any of eight effects. The input jack (which paradoxically must be viewed as the guitar's output) gets the first rotary switch pole, and it can be switched to the input of either seven effects or the output jack, which counts as one of the places for the input to go. www.diystompboxes.com /smfforum/index.php?topic=43104.0   (3117 words)

Cisco 12000 Series Internet Router: Switch Fabric   (Site not responding. Last check: 2007-10-30) The switch fabric is an NxN non-blocking crossbar switch fabric where N stands for the maximum number of LCs that can be supported in the chassis (this includes the GRP). The switch fabric cards in the 12016 and 12416 are not easy to insert, and may require a little bit of force. The unit of transfer across the crossbar switch fabric is always fixed-size packets, also referred to as Cisco cells, which are easier to schedule than variable-size packets. www.cs.ualberta.ca /~macg/C605/Routers/Cisco_12000/Fabric.html   (2951 words)

16-Port Myrinet Switch with 8 LAN ports & 8 SAN ports   (Site not responding. Last check: 2007-10-30) These 16-port Myrinet switches are based on a 16x16 crossbar switch implemented in a single, custom-VLSI chip (XBar16). Because of the high degree of these switches, and because of their monitoring features, they are particularly well-suited for large clusters. In a typical application of the M2LM-SW16 switch pictured below, the 8 SAN ports connect via SAN cables to hosts with Myrinet/SAN interfaces within a cabinet to form a sub-cluster, and the 8 LAN ports are used for cabinet-to-cabinet, switch-to-switch connections that form the overall, scalable-network topology. www.myri.com /myrinet/switches/m2lm-sw16.html   (507 words)

HP: For circuits, swap silicon for molecules | Tech News on ZDNet The difference is that crossbar latches--which consist of a grid of microscopic wires linked by molecules at their intersections--are far smaller and, potentially, far cheaper to make because they are produced using processes more akin to inkjet printing rather than the ornate etching processes required for today's chips. HP has already shown how crossbar latches can be used in memory. Adoption of crossbars across the industry could also lead to royalties for HP, which may try to license it, added Stan Williams, director of the QSR. news.zdnet.com /2100-9584_22-5557954.html   (692 words)

EETimes.com - Researchers offer alternative to typical crossbar design The growing importance of crossbar switch matrices, now used for on-chip interconnect as well as for switching fabric in routers, has led to increased study of the best ways to build these parts. The obvious way to implement a crossbar switch fabric, according to presenter Tsui, is to simply route inputs horizontally and outputs vertically, and then to place a pass transistor at each intersection. Setting up the switch requires n-squared control bits, and, more important for high-bandwidth interconnect, the performance of each connection is limited by the on-resistance of the pass transistor and the capacitance of both the input and output lines, all of which must be long enough to span the entire matrix in a fully populated switch. www.eetimes.com /story/OEG20020820S0054   (951 words)

Telephone World - Telephone Switch Timeline 1938 - The first #1 Crossbar switch is installed at the Troy Avenue central office in Brooklyn, NY. The #1ESS is transistor based and is used as a local metropolitan switch allowing for 65,000 lines and 16,000 trunks. This switch was probably the last fully electro-mechanical switch in the North American PSTN. www.dmine.com /phworld/switch/timeline.htm   (1049 words)

Crossbar Switch Reference Design   (Site not responding. Last check: 2007-10-30) Xilinx' second generation Crossbar Switch (Crosspoint Switch) is a parametrizable design for implementing high performance, area efficient, non-blocking crosspoint switches in Virtex-II and Virtex-II Pro/Pro X FPGAs. Like the original crossbar switch design, this second generation employs the partial reconfiguration to modify crossbar connections. The new switch uses a Clos architecture, as shown in figure1, which results in significant area savings. www.xilinx.com /esp/wired/optical/xlnx_net/xbar_switch.htm   (325 words)

Custom design crossbar switch   (Site not responding. Last check: 2007-10-30) San Jose, Calif. — A customisable crossbar switch that implements digital cross-point switching functions on the Virtex-II and Virtex-II Pro FPGA devices is now available. The programmable, parameterizable switch is aimed at applications such as digital crossconnects, add-drop multiplexers, video, broadcast, and ATM switches. The design exploits configurable routing within the FPGA and delivers a device said to be significantly smaller and more cost effective than a standard multiplexer-based cross-point solution. www.commsdesign.com /printableArticle/?articleID=16505895   (88 words)

(WO/1999/014876) CONSTANT PHASE CROSSBAR SWITCH   (Site not responding. Last check: 2007-10-30) A constant phase crossbar switch system (50) which avoids phase discontinuities at the outputs of the crossbar switch. The crossbar switch system includes input logic (56a---56n), a crossbar switch (58), output logic (60a---60n) and a phase locked loop (68). The selected version of the data stream is employed as the active input to the crossbar switch. www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=99/14876.990325   (420 words)

Xilinx Announces Industry's First Programmable Crossbar Switch Solution The crossbar switch is ideal for use in applications such as digital crossconnects, add-drop multiplexers, video, broadcast, and ATM switches. The Crossbar solution leverages the advanced capabilities of Xilinx Virtex-II and Virtex-II Pro FPGA families by employing the partial reconfiguration capability of the FPGA family to implement the desired crossbar connection pattern. The Crossbar switch is available now from Xilinx as a custom design. www.us.design-reuse.com /news/news4113.html   (575 words)

Marvell: Prestera-FX Fabric Processors and Crossbar Switch Fabrics The Marvell Prestera™-FX family of fabric processors and crossbar switch fabrics offers exceptional expandability and scalability for Prestera packet processors. The fabric processors are single-chip traffic managers with an integrated crossbar and Serializer/Deserializer (SERDES) for low cost, high-performance scaling for stackable and chassis systems in data centers, multi-tenant buildings and enterprise wiring closets. The Prestera crossbar switch fabrics provide the ideal solutions for high-performance, high-reliability chassis systems in enterprise core and metro edge networks. www.marvell.com /products/switching/presterafx/index.jsp   (145 words)

Distributed crossbar switch architecture (US5410300)     A switching array as described for connecting ones of a plurality of data sources to ones of a plurality of data sinks. A distributed crossbar switching array for substantially simultaneously connecting data sources to one or more of a plurality of data sinks available for connection, said distributed crossbar switching array comprising: Modular crossbar interconnection metwork for data transactions between system units in a multi-processor system www.delphion.com /details?pn=US05410300__   (415 words)

[No title] Even when one switching domain is disabled, the remaining three seven switching domains can still provide a speed up of 1.5 8 times that of the link data rate. The switch fabric supports lossless backp pressure protocol on a per class per port basis. With raw switching capacity of 22Tbps and user bandwidth of up to 640Gbps, itthe switch fabric provides for high performance, low power, low pin-count and low chip-count system solutions for 10Gbps Ethernet and ATM/IP switch applications (64x64x10Gbps or 256x256x2.5Gbps). www.hoti.org /archive/hoti8papers/002.doc   (1158 words)

Datamation Product Watch - GLX4000 288 (Curtiss-Wright Controls, Inc) The GLX4000 288 is a non-blocking, crossbar switch that enables any of a variety of input signals to be connected to any of its 288 output ports. The switch can also be configured to accept direct Firewire connections at rates up 1600 Mb/s. Because the GLX4000's blades all connect to a common backplane, the switch's cross-connect functionality extends across any combination of blades and ports. products.datamation.com /networking/lan/1119549076.html   (310 words)

ACCENT's Adaptive Memory Crossbar This is accomplished by supporting 8 dual processor P6x system buses operating in parallel, connected with each other by a crossbar switching array, each interconnected with three other complexes through a second dimensional crossbar.. Four application-specific IC (ASIC) chips implement the Adaptive Memory Crossbar layer for the Multidimensional Axis (Z-Memory). The Adaptive Memory Crossbar uses standard Intel 850 PCI bridges between the four PCI buses and the 16 P6 buses. www.compamerica.com /accent/accentwhitepapers.htm   (1279 words)

PMC-Sierra - PM8620 NSE-20G 20G Narrowband Switch Element (via CobWeb/3.1 planetlab1.netlab.uky.edu)   (Site not responding. Last check: 2007-10-30) In SBI mode, switches DS0 or NxDS0 for all T1 and E1 tributaries and aggregate columns for switching T1, E1, VT1.5, VT2, DS3 and E3 tributaries. The NSE 20G can be used with the companion SBS devices to implement a switch fabric scaleable to 20 Gbit/s. Supports two sets of switch settings and a controlled method of changing settings on STS-12 frame boundaries. www.pmc-sierra.com.cob-web.org:8888 /products/details/pm8620   (497 words)

Vitesse - Product - VSC882 (GigaStream) - Crossbar Switch for use with GigaStream Queuing Engine   (Site not responding. Last check: 2007-10-30) Crossbar Switch for use with GigaStream Queuing Engine GigaStream Intelligent Switch Fabric Applications in 3G Wireless Systems Why Modern Switch Fabrics use a Fixed-Size Frame Format www.vitesse.com /products/product.php?number=VSC882   (121 words)

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