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E20-080 - EMC Technology Foundations - NS - Dump Information

Vendor : EMC
Exam Code : E20-080
Exam Name : EMC Technology Foundations - NS
Questions and Answers : 210 Q & A
Updated On : February 15, 2019
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E20-080 EMC Technology Foundations - NS

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E20-080 exam Dumps Source : EMC Technology Foundations - NS

Test Code : E20-080
Test Name : EMC Technology Foundations - NS
Vendor Name : EMC
Q&A : 210 Real Questions

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EMC EMC Technology Foundations -

Dell EMC-VMware Integration Paying Off In big Channel sales good points | killexams.com Real Questions and Pass4sure dumps

VirtuIT programs President Michael Murphy is seeing large earnings gains on account of the more and more tight engineering integration between Dell EMC and VMware offerings.

truly, Murphy, a longtime Dell associate based mostly in Nanuet, N.Y., spoke of VirtuIT’s Dell EMC networking company is up 200 percent, whereas his storage revenue are up as an awful lot as 40 p.c on account of the Dell EMC-VMware collaboration.

“the key for us to being a success is to be that bridge for Dell EMC and VMware,” mentioned Murphy. “We carry every thing together in order that the customer sees us as the potential to the conclusion to get them on their technique to digital transformation.”

Murphy isn’t alone. other Dell companions are also seeing big sales good points on account of the breakthroughs in product simplicity and price/performance from the Dell EMC and VMware engineering groups working side by side.

know-how collaboration between the two businesses this 12 months is determined to “speed up” throughout a wide variety of areas starting from client and computing device offerings to storage and networking, said Tom sweet, executive vice president and CFO at Dell.

“You seem on the variety of solution workstreams that we've going at this time with VMware—even if it’s around hyperconverged infrastructure or Workspace ONE in our client area or around what we’re doing with vSAN and vSAN in a position Nodes—so throughout the spectrum you’re going to see us accelerate a few these integrated options. We’re confident and excited about it,” noted candy. “VMware is a great platform in the market when it comes to their position in virtualized infrastructure, but you additionally feel about what they’re doing with VMware’s NSX and the network, we now have a lot of undertaking going on in the networking space. It’s pretty entertaining instances.”

Ashley Gorakhpurwalla, president and universal manager of Dell EMC’s Server and Infrastructure techniques, stated working hand in hand with VMware’s engineering and construction groups has given Dell EMC what he calls a “complete skills” to force know-how differentiation within the intensely aggressive hyper-converged market.

“beneath the Dell applied sciences umbrella, what we’re in a position to put collectively is truly co-engineering with VMware,” he referred to. “we've a mixed crew. It’s now not a Dell EMC or a VMware crew. it is a mixed group.”

That capacity true engineers from both businesses are “dedicated to the task of constructing the most advantageous hyper-converged infrastructure operating system and appliance,” spoke of Gorakhpurwalla.

“We gained dazzling scale via our PowerEdge [server] business that allows for us to free up distinct ranges of know-how, however most importantly, we opened up an extra level of deep integrated engineering as a result of now we personal every thing—all the manner from the silicon, fiberglass and sheet steel, the entire means as much as the cloud,” spoke of Gorakhpurwalla.

one other big channel improvement from the tighter relationship is that VMware channel reps and account managers are now working alongside Dell EMC’s channel groups.

“The VMware reps are in the equal box offices as the Dell guys,” said Murphy. “one of the crucial first questions we’re now asking our revenue team is, ‘who is the VMware rep? in case you don’t comprehend the VMware rep, then you definitely’re now not doing the appropriate activities when it comes to earnings.’”

The stepped-up 2019 Dell EMC-VMware integration offensive comes on the heels of a blizzard of product integrations together with Dell Provisioning for VMware’s Workspace ONE, which enables automated equipment setup and extends the efficiencies of cloud management. additionally, Dell’s VxRack hyper-converged system now integrates with updated types of VMware’s Cloud basis, NSX and vRealize Suite, as well as with VMware’s multi-cloud utility-as-a-service solution, VMware Cloud meeting.

looking forward, Gorakhpurwalla pointed out if VMware has a expertise on its road map, that you would be able to bet that it might be on the Dell EMC road map as smartly.

“we now have a dedication that after VMware offers a function, a ability, we already find out about it—we’ve already demonstrated it and we’ll make it accessible to companions and shoppers within that month,” Gorakhpurwalla talked about. “in the event that they unencumber an express patch to a tremendous liberate, we’ll be there at the identical time because we’re co-engineering and shoppers are asking us to be capable of supply the quickest time to market with these cost-added features.”


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Brocade SAN textile technologies deliver solid foundation for brand new EMC VSPEX With VMAX3 100K Infrastructure solution | killexams.com Real Questions and Pass4sure dumps

LAS VEGAS, NV--(Marketwired - may also 5, 2015) - Brocade (NASDAQ: BRCD)

  • Brocade Gen 5 Fibre Channel SAN switches and administration application help make sure predictable performance, unmatched resiliency and extremely-quick entry to facts for EMC VMAX3 storage
  • Brocade cloth vision know-how helps avoid issues earlier than they affect operations, speed up utility deployments and dramatically in the reduction of operational prices
  • Brocade (NASDAQ: BRCD) today announced the business's Gen 5 Fibre Channel storage area network (SAN) technologies play a vital role in supplying reliability and predictable efficiency for the brand new EMC® VSPEX® with VMAX3™ 100K converged infrastructure solution that become unveiled today at EMC World. the brand new solution is in accordance with the EMC VSPEX reference architecture and is designed for virtualized cloud-based mostly birth and management of IT substances.

    VSPEX with VMAX3 100K is goal built to carry and manipulate predictable carrier levels at scale for hybrid clouds. here is designed to supply shoppers with the skill to seamlessly bridge their VMware private cloud deployment with public clouds, paving the style forward to hyperconsolidate and fix on- and off-premise workloads into a hybrid cloud environment.

    Brocade Gen 5 Fibre Channel SAN switches and management application provide an exceptional .groundwork between the VMAX3 100K storage arrays and servers. All facets of this reference architecture had been verified and authorized as a solution by using EMC.

    "Converged infrastructures for high-conclusion, business-important purposes fill a tremendous void in the industry," pointed out Jack Rondoni, vice president, storage networking, at Brocade. "For these environments, Brocade Fibre Channel fabrics enable the server and storage to know their full competencies by maximizing network uptime, simplifying SAN administration and presenting remarkable visibility and perception throughout the whole storage network."

    The SAN for VSPEX with VMAX3 100K is developed on Brocade Gen 5 Fibre Channel SAN switching and material imaginative and prescient™ monitoring and community diagnostic technologies. Branded and offered in the course of the EMC Connectrix® family, the Brocade SAN helps be sure predictable efficiency, unmatched resiliency and ultra-fast entry to information kept on the EMC VMAX3 100K arrays, every of which are fundamental for guaranteeing predictable service degrees, at scale, for hybrid clouds.

    Brocade material imaginative and prescient know-how is advanced hardware and application that mixes capabilities from Brocade hardware, the embedded working equipment (Brocade material OS®) and administration software (Brocade community consultant). Leveraging innovative monitoring, diagnostics and management capabilities, Brocade material vision expertise offers administrators with the ability to expect and preempt problems earlier than they have an effect on operations, speed up software performance and dramatically reduce operational fees.

    "Brocade Fibre Channel SANs are a depended on, top of the line-of-breed solutions for hundreds of EMC high-end storage purchasers in lots of of the realm's most stressful environments," referred to Gil Shneorson, vice chairman, widespread supervisor, VSPEX, EMC agency. "The Brocade SAN technologies had been a logical alternative for supporting the VSPEX VMAX3 100K converged structure to permit the same reliability, agility and simplicity for organizations who need to bring capabilities by way of hybrid-cloud IT architectures."

    Product and know-how particulars

    EMC Connectrix DS-6510B 16 Gb SAN swap

  • forty eight-port, high-performance, commercial enterprise-type switch that meets the demands of particularly virtualized and private cloud storage environments
  • offers maximum flexibility, simplicity, and reliability in an efficiently designed 1U equipment.
  • Maximizes availability with redundant, sizzling-pluggable add-ons and non-disruptive application improvements
  • Brocade fabric imaginative and prescient

  • policy-based tools that simplify textile-extensive threshold configuration and monitoring
  • administration tools that permit directors to establish, video display and analyze certain software information flows, with out the want for expensive, disruptive, third-celebration equipment
  • Monitoring equipment that observe community congestion and latency within the material, offering visualization of bottlenecks and picking exactly which instruments and hosts are impacted
  • Customizable health and performance dashboard views, proposing all crucial information in one reveal
  • Cable and optic diagnostic features that simplify the deployment and aid of huge fabrics
  • Pricing and Availability

    Brocade SAN material applied sciences for EMC VSPEX with VMAX 100K3 are now accessible from EMC VSPEX-enabled enterprise companions. Pricing assistance is additionally accessible from these partners.

    About Brocade

    Brocade (NASDAQ: BRCD) networking solutions aid the world's main agencies transition easily to a global the place applications and counsel dwell anyplace. (www.brocade.com)

    © 2015 Brocade Communications systems, Inc. All Rights Reserved.

    ADX, Brocade, Brocade Assurance, the B-wing symbol, DCX, cloth OS, HyperEdge, ICX, MLX, MyBrocade, OpenScript, The easy community, VCS, VDX, Vplane, and Vyatta are registered emblems, and textile imaginative and prescient and vADX are emblems of Brocade Communications methods, Inc., in the u.s. and/or in different countries. different manufacturers, items, or provider names mentioned could be logos of others.


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    Clustered NAS: How to choose the right clustered NAS system | killexams.com real questions and Pass4sure dumps

    What you'll learn: Data storage managers must have a clear picture of their unstructured data and file-system environment...

    before investing in a clustered NAS system. We'll give you a list of questions to ask when evaluating your storage requirements and the latest clustered NAS offerings.

    Clustered network-attached storage (clustered NAS) uses a distributed file system that runs concurrently on multiple nodes or servers. Unlike traditional NAS, clustered NAS stripes data and metadata across storage nodes and subsystems. Clustering also provides access to all files from any of the clustered nodes regardless of the physical location of the file. But how do you determine which clustered NAS system is right for you? Here are the questions you need to ask when evaluating your own data storage requirements along with the latest offerings from vendors.

    What is the maximum number of file systems and file objects the system can handle?

    NAS has an issue with how many file objects it can manage under one system, according to Marc Staimer, president at Dragon Slayer Consulting. When that limit of file objects is reached, the system tends to shut down without warning, he explained. "It's a real pain to take data off of the system to make it functional enough to start migrating data to another system. So it's not a capacity issue, it's a file object issue more often than not."

    Does the vendor's file system span multiple nodes?

    If the answer is yes, can the system write concurrently across all of the nodes? If each node can't write data concurrently across every node, you may run into I/O shipping problems where write requests have to be "shipped" to the data's file-system master node. That could kill expected performance gains.

    What's the I/O profile of your applications?

    Terri McClure, a senior analyst at Enterprise Strategy Group, said this is important because some scalable NAS systems are optimized for throughput rather than I/O, and don't handle a lot of small I/O requests.

    What types of data will sit on your clustered NAS system?

    Systems such as BlueArc Corp.'s BlueArc Titan and Mercury, Hewlett-Packard (HP) Co.'s HP X9000 Network Storage System (NSS) and Isilon Systems Inc.'s X-Series are good fits if you plan to store large sequential files such as rich media and video. However, these systems may not fit as well for mainstream enterprise file serving.

    Do you just need a NAS accelerator?

    If you only need capacity for unstructured data, you might not need a clustered NAS system at all, according to Greg Schulz, founder and senior analyst at storage industry consulting firm StorageIO Group. Instead, there are single-node NAS systems that have plenty of capacity. If you just need better performance, the same consideration applies. It's possible you might need a NAS accelerator instead. Arun Taneja, founder and consulting analyst at Taneja Group, said scalable NAS systems are built for high utilization rates; once you have your system, you should be using a significant amount of the system's capacity. "If you're operating at anything less than 80% storage utilization, you're not using that clustered NAS box correctly," Taneja said. "Or the clustered NAS box is not very good and you should throw it out."

    Clustered NAS or scale-out NAS architectures vary among data storage vendors

    Nearly all major storage vendors have some kind of clustered NAS systems by now, but many of them are comparable in name only. That's because these systems -- also known as scale-out NAS -- were built with widely different architectures in an attempt to solve unstructured data performance, capacity and availability issues.

    "Right now, the industry seems to think clustered NAS is just clustered NAS," Taneja said. "But just look at the architectural differences; they're not even apples and oranges. It's like apples and beer." Consider three of the industry's biggest names: EMC Corp., Hewlett-Packard (HP) Co. and NetApp Inc.

    EMC is an early NAS vendor that arrived relatively late to the clustered NAS scene. Its current clustered NAS system is the Celerra NS-960 with multi-path file system (MPFS). The Celerra NS-960 is part of EMC's unified storage platform, and scales to eight blades and 960 drives. MPFS separates the file and data paths so requests can be fulfilled using either NFS or iSCSI, depending on the data requested.

    HP acquired two scalable NAS startups in recent years. Its HP X9000 NSS is based on technology from its 2009 acquisition of Ibrix Inc. The Ibrix technology is best suited for high-performance computing (HPC) where customers need access to large number of files from a single repository, such as media, entertainment and life sciences. HP also acquired PolyServe in February 2007 and turned that clustered file system software technology into its 9100 Extreme Data Storage (ExDS9100) system, which is best suited for high I/O environments such as transactional databases.

    NetApp uses its Data Ontap 8 for scale-out NAS. Ontap 8 combines the vendor's Data Ontap 7G and GX platforms. Taneja predicted Ontap 8 won't see wide acceptance until NetApp upgrades the product to accommodate more than two nodes and integrates its SnapManager software. Ontap 8.1 is scheduled for release during the second quarter of 2011. NetApp acquired the technology for its clustered NAS by buying Spinnaker in 2003.

    Dell Inc. and IBM are two other large vendors with new or anticipated scalable NAS systems. Dell scooped up Exanet Inc.'s assets earlier this year, and is using that technology to develop its own clustered NAS product. IBM introduced its Scale Out Network Attached Storage (IBM SONAS) in February. SONAS uses IBM's General Parallel File System (GPFS), includes up to 30 System x3650 nodes and allows up to 256 snapshots per node.

    From a technology standpoint, these major vendors are trying to catch up with smaller companies that started as clustered NAS vendors and have been selling scalable systems for years. They include BlueArc, whose Titan 3000 series can scale up to 4 PB within a single namespace and supports NFS and CIFS (Hitachi Data Systems sells BlueArc Titan and Mercury platforms through an OEM deal); and Isilon Systems Inc.

    Other scalable NAS offerings include Panasas Inc.'s ActiveStor modular clustered system used primarily in the HPC industry, and Symantec Corp.'s Veritas Storage Foundation Scalable File Server, an appliance based on Veritas Cluster File System.


    Short Tutorial on VXI | killexams.com real questions and Pass4sure dumps

    VXI Tutorial

    The purpose of this application note is to help you gain an understanding of VXI and MXI concepts. This application note is divided into two tutorial sections. The first section discusses VXI and the second section discusses MXI.

    This section contains an overall introduction to VXI (VMEbus eXtensions for Instrumentation).

    What Is VXI?

    The VXIbus Consortium was formed in 1987 with a charter of defining a multivendor instrument-on-a-card standard. Since that time, the Consortium has defined system-level components required for hardware interoperatibility. The IEEE officially adopted the VXI specification, IEEE 1155, in March 1993. The VXIplug&play Systems Alliance, founded in September 1993, sought a higher level of system standardization to cover all VXI system components. By focusing on software standardization, the alliance defined standards to make VXI systems easy to integrate and use while maintaining multivendor software interoperatibility. With the success of multivendor standards and solid technical specifications, VXI is backed by more than 250 vendors, with more than 1000 products available. The success of VXI as an open, multivendor platform is a testament to the value of multivendor standards, and has made VXI the platform of choice for open instrumentation systems.

    VXI is used in many different applications ranging from test and measurement and ATE, to data acquisition and analysis in both research and industrial automation. Although some VXI systems today are purely VXI, many users are migrating to VXI by integrating it into existing systems consisting of GPIB instruments, VME cards, or plug-in data acquisition (DAQ) boards. You can control a VXI system with a remote general-purpose computer using the high-speed Multisystem eXtension Interface (MXI) bus interface or GPIB. You can also embed a computer into a VXI chassis and control the system directly. Whatever your system configuration needs may be, VXI offers the flexibility and performance to take on today’s most challenging applications.

    The Need for VXIbus

    The demand for an industry-standard instrument-on-a-card architecture has been driven by the need for physical size reduction of rack-and-stack instrumentation systems, tighter timing and synchronization between multiple instruments, and faster transfer rates than the 1 Mb/s rate of the 8-bit GPIB. The modular form factor, high bandwidth, and commercial success of the VMEbus made it particularly attractive as an instrumentation platform. The tremendous popularity of GPIB also made it attractive as a model for device communication and instrument control protocols. The VXIbus specification adds the standards necessary to combine the VMEbus with GPIB to create a new, modular instrumentation platform that can meet the needs of future instrumentation applications.

    VXI brings the following benefits to instrumentation users:

  • Open, multivendor standards maximize flexibility and minimize obsolescence
  • Increased system throughput reduces test time and/or increases capabilities
  • Smaller size and higher density reduce floor space, enhance mobility or portability, and give close proximity to device(s) being tested or controlled
  • More precise timing and synchronization improve measurement capability
  • Standardized VXIplug&play software eases system configuration, programming, and integration
  • Modular, rugged design improves reliability, increases mean time between failure (MTBF), and decreases mean time to repair (MTTR)
  • The Value of Open Industry Standards

    The baseline VXI hardware specifications are a mandate for interoperatibility between hardware products from different vendors. These specifications cover mechanical and environmental requirements such as module sizes, mainframe and module cooling, and EMC compatibility between modules, as well as automated system initialization and backplane communication protocols. The VXIplug&play Systems Alliance builds on these baseline specifications to address the system as a whole with the goal of having the user up and running in “five minutes or less.” Building a system based on open industry standards means that you choose components for your system based on your requirements, regardless of vendor. Open standards also ensure that once your system is built, your investment will continue to pay dividends well into the future.

    Both the VXIbus Consortium and the VXIplug&play Systems Alliance remain strong, active organizations committed to maintaining VXI as an open, multivendor technology and increasing its ease of use and end-user success. In fact, many of the largest instrument suppliers in the world are members of both organizations, including National Instruments, GenRad, Hewlett-Packard, Racal Instruments, and Tektronix. With VXIplug&play, you are assured that components from different vendors work reliably in the same system. Members of the VXIbus Consortium and the VXIplug&play Systems Alliance have combined their expertise to develop technically sound standards for both hardware and software, bringing the entire industry into a new generation of instrumentation – a generation that stresses ease of use and open systems without sacrificing flexibility or performance.

    VXIbus Mechanical Configuration

    Physically, a VXIbus system consists of a mainframe chassis that has the physical mounting and backplane connections for plug-in modules, as shown in Figure 1. The VXIbus uses the industry-standard IEEE-1014 VMEbus as a base architecture to build upon. As shown in Figure 2, VXI uses the full 32-bit VME architecture, but adds two board sizes and one connector. The P1 connector and the center row of the P2 connector are retained exactly as defined by the VME specification. The VME user-definable pins on the P2 connector and the additional pins on P3, the third VXI connector, implement instrumentation signals between plug-in modules directly on the backplane.

    The VXIbus specification includes packaging requirements, electromagnetic compatibility, power distribution, cooling, and airflow for VXIbus mainframes and plug-in modules. The modules are installed in the mainframe slots. LEDs, switches, test points, and I/O connections are accessible from the module front panel.

    Module and Mainframe Cooling

    Airflow direction is from bottom (P3) to top (P1). Cooling requirements must be established for all modules and included in product specifications. These requirements must include an operating point of minimum airflow requirement. Mainframe suppliers must also provide similar information for their mainframes.

    EMC and Noise

    The addition of a new module to a VXIbus system must not degrade the performance of any other module. The VXIbus specification includes near-field radiation and susceptibility requirements, which prevent one module from interfering with the operation of other modules. To help meet these requirements, the VXIbus module width was increased from the 0.8 in. VME requirement to 1.2 in., so that there is enough room for the module to be completely enclosed in a metal case for shielding. The metal cases connect to backplane grounds. Thus, you can use existing VME boards in a VXIbus chassis, but not vice versa.

    The VXIbus specification also has conducted-emissions and susceptibility requirements, which prevent any power supply noise from affecting the performance of a module. For far-field radiated emissions such as FCC and VDE, each module must not contribute more than its share of the total. For example, in a mainframe that holds 13 modules, each module must not contribute more than 1/13 of the allowed total. Because of the desire for extremely precise time coupling between modules using the backplane, it is necessary to minimize the noise and crosstalk on the backplane clock and trigger signal lines. The backplane is required to be a single, monolithic board across any one slot. The VXIbus specification has a tutorial section on how to design a backplane for low noise and high signal integrity.

    Hardware Registers

    VXI modules must have a specific set of registers located at specific addresses, as shown in Figure 3. The upper 16 KB of the 64 KB A16 address space are reserved for VXIbus devices. Each VXI device has an 8-bit logical address that specifies where its registers are located in this address space. A single VXI system can have up to 256 VXI devices. The logical address of a VXI device, which can be manually set or automatically configured by the system at startup, is analogous to the GPIB address of a GPIB device.

    Register-Based Devices

    Because of the VXI configuration registers, which are required for all VXI devices, the system can identify each VXI device, its type, model and manufacturer, address space, and memory requirements. VXIbus devices with only this minimum level of capability are called Register-Based devices. With this common set of configuration registers, the centralized Resource Manager (RM), essentially a software module, can perform automatic system and memory configuration when the system is initialized.

    Message-Based Communication

    In addition to Register-Based devices, the VXIbus specification also defines Message-Based devices, which are required to have communication registers and configuration registers. All Message-Based VXIbus devices, regardless of the manufacturer, can communicate at a minimum level using the VXI-specified Word Serial Protocol. When minimum communication is possible, higher-performance communication channels, such as shared-memory channels, can be established to take advantage of the VXIbus bandwidth capabilities.

    Word Serial Protocol

    The VXIbus Word Serial Protocol is functionally very similar to the IEEE-488 protocol, which transfers data messages to and from devices one byte (or word) at a time. Thus, VXI Message-Based devices communicate in a fashion very similar to IEEE-488 instruments. In general, Message-Based devices typically contain some level of local intelligence that uses or requires a high level of communication.

    All VXI Message-Based devices are required to use the Word Serial Protocol to communicate in a standard way. The protocol is called word serial, because if you want to communicate with a Message-Based device, you do so by writing and reading 16-bit words one at a time to and from the Data In (write Data Low) and Data Out (read Data Low) hardware registers located on the device itself. Word Serial communication is paced by the bits in the response register of the device, indicating whether the Data In register is empty and whether the Data Out register is full. This operation is very similar to Universal Asynchronous Receiver Transmitter (UART) on a serial port.

    Commander/Servant Hierarchies

    The VXIbus defines a Commander/Servant communication protocol so you can construct hierarchical systems using conceptual layers of VXI devices. This structure is like an inverted tree. A Commander is any device in the hierarchy with one or more associated lower-level devices, or Servants. A Servant is any device in the subtree of a Commander. A device can be both a Commander and a Servant in a multiple-level hierarchy.

    A Commander has exclusive control of the communication and configuration registers of its immediate Servants (one or more). Any VXI module has one and only one Commander. Commanders communicate with Servants through the communication registers of the Servants using the Word Serial Protocol if the Servant is a Message-Based device, or by device-specific register manipulation if the Servant is a Register-Based device. Servants communicate with their Commander by responding to the Word Serial commands and queries from their Commander through the Word Serial protocol if they are Message-Based, or by device-specific register status if they are Register-Based.

    Interrupts and Asynchronous Events

    Servants can communicate asynchronous status and events to their Commander through hardware interrupts or by writing specific messages (signals) directly to their Commander's hardware Signal Register. Nonbusmaster devices always transmit such information via interrupts, whereas devices that have busmaster capability can either use interrupts or send signals. Some Commanders can receive signals only, whereas others might be only interrupt handlers.

    The VXIbus specification contains defined Word Serial commands so that a Commander can understand the capabilities of its Message-Based Servants and configure them to generate interrupts or signals in a particular way. For example, a Commander can instruct its Servants to use a particular interrupt line, to send signals rather than generate interrupts, or configure the reporting of only certain status or error conditions.

    Although the Word Serial Protocol is reserved for Commander/Servant communications, peer-to-peer communication between two VXI devices can be established through a specified shared-memory protocol or by simply writing specific messages directly to the signal register of the device. Slot 0 and the Resource Manager

    The leftmost slot of a VXI chassis has special system resources such as backplane clocks, configuration signals, and synchronization (trigger) signals and therefore must be occupied by a device with VXI “Slot 0” capabilities. The VXI Resource Manager (RM) function, essentially a software module, can reside on any VXI module or even on an external computer. The RM, in combination with the Slot 0 device, identifies each device in the system, assigns logical addresses, memory configurations, and establishes Commander/Servant hierarchies using the Word Serial Protocol to grant Servants to the Commanders in the system. After establishing the Commander/Servant hierarchy, the RM issues the Begin Normal Operation Word Serial command to all top-level Commanders. During normal system operation, the RM may also halt the system and/or remap the hierarchy if necessary.

    Three Ways to Control a VXI System

    System configuration is divided into three categories. The first type of VXI system consists of a VXI mainframe linked to an external controller via the GPIB. The controller talks across the GPIB to a GPIB-VXI interface module installed inside the VXI mainframe. The GPIB-VXI interface transparently translates the GPIB protocol to and from the VXI Word Serial protocol.

    The second configuration involves a VXI-based embedded computer. The embedded computer is a VXI module that resides inside the VXI mainframe and connects directly to the VXI backplane. This configuration offers the smallest physical size for a VXI system as well as performance benefits due to direct connection to the VXI backplane.

    The third configuration uses a high-speed MXIbus link from an external computer to control the VXI backplane. The external computer operates as though it is embedded directly inside the VXI mainframe. This configuration is functionally equivalent to the embedded method, except that it has the flexibility for use with a wide variety of computers and workstations.

    VXI Bus Interface Software

    One of the most important considerations when selecting a VXI system is software. Software is the key to developing successful systems based on the VXIbus. There are many programming languages, operating systems, and application development environments (ADE) to choose from when building a VXI system. It is important to make the right decisions to realize all of the advantages that VXI has to offer, while minimizing your development costs now and in the future.

    Your software decisions not only affect overall system performance and system capability, but also development time and productivity. You should choose tools that have complete debugging capability and that work with the most popular operating systems and programming languages. If you choose to program your VXI system using a standard language such as C, C++, Basic, ADA, or ATLAS, you should realize that standard programming languages do not come with built-in VXI capability. Rather, VXI capability is added through a VXI bus interface software library. This software component is very important, because it affects the choice of VXI computer hardware, operating system, programming language, and ADE.

    Industry-Wide Software Standards

    As a step toward industry-wide software compatibility, the VXIplug&play alliance developed one specification for I/O software – the Virtual Instrument Software Architecture (VISA). The VISA specification, VPP-4.1, defines a next-generation I/O software standard not only for VXI, but also for GPIB and serial interfaces. With the VISA standard endorsed by more than 50 of the largest instrumentation companies in the industry including Tektronix, Hewlett-Packard, and National Instruments, VISA unifies the industry by facilitating the development of interoperable and reusable software components able to stand the test of time. Before VISA, there were many different commercial implementations of I/O software for VXI, GPIB, and serial interfaces; however, none of these I/O software products were standardized or interoperable.

    The VISA standard lays the foundation and provides a unified migration path for industry-wide software compatibility. One of the most notable benefits of VISA is its ability to significantly reduce the time and effort involved in programming different I/O interfaces. Instead of using a different API devoted to each interface bus, you can use the VISA API regardless of whether your system is controlled by GPIB, VXI, or a GPIB-VXI.

    With the vast number of choices in instrumentation and software now available, most users do not want to be locked into a specific vendor for their systems. Instead, they would prefer the freedom to select the best instruments and software available from multiple vendors and have it all work together with minimal effort. The IEEE 488.1 and IEEE 488.2 standards (for GPIB) and the IEEE 1155 standard (for VXI) ensured that the hardware would be interoperable, but this approach was not taken for the software. Therefore, the ideal new driver architecture should be a standard adopted by as many of the major vendors as possible. Then you could be assured that any code written for your instrument is portable across controller vendors as well as operating systems. This is exactly what the VXIplug&play Systems Alliance has done with VISA.

    MXI Tutorial

    This section contains an overall introduction to MXI.

    MXIbus Overview

    The MXIbus is a powerful, high-speed communication link that interconnects devices using a flexible cabling scheme. Derived from the VMEbus, MXI provides a high-performance way of controlling VXI systems using commercially available desktop computers and workstations. National Instruments developed and published the MXI specification and released it as an open industry standard in 1989. In 1995, National Instruments introduced MXI-2, which offers even higher performance.

    An MXIbus system configuration combines the performance benefits of a custom embedded VXI computer with the flexibility and availability of general-purpose computers. The MXIbus system configuration uses the high-speed MXIbus cable to connect an external computer directly to the VXI backplane. With the MXIbus, you can locate the computer directly next to the VXI mainframe, or up to 20 meters away. Using the MXIbus, you can easily add other VXI mainframes, and use the plug-in slots in the external computer for GPIB-control, plug-in DAQ boards, or other peripheral adapter cards.

    For instrument control, MXI complements high-speed platforms such as PCI by harnessing their high-throughput potential. PCI-based desktop PCs compete with the most advanced computer workstations to provide a low-cost platform that delivers superior performance. You can use low-cost desktop computers to control sophisticated VXI instrumentation without sacrificing performance or control. More importantly, as new desktop computers incorporate the latest technology including faster, more capable microprocessors and RAM, you can easily upgrade your VXI system as these newer and faster computers emerge to immediately reap increased VXI performance gains. Thus, a PCI-based MXI-2 solution such as our VXI-PCI8000 gives you excellent performance now with headroom for the future.

    A New Generation of VXI Connectivity

    Many VXI users migrate from GPIB-based systems. As a result, the National InstrumentsGPIB-VXI is a popular way to control VXI instruments from a GPIB controller. An increasingly popular way to control VXI, however, is to use a custom VXI computer that plugs directly into the VXI mainframe, such as the National Instruments VXIpc™ and VXIcpu™ Series of embedded VXI computers. This embedded approach is technically attractive because the computer communicates directly with the VXIbus and is tightly coupled to the instruments.

    Although an embedded computer is very powerful, custom VXI computers cannot possibly keep pace with the general-purpose computer market. In the last decade, specialized instrument controllers have rapidly declined. General-purpose PCs and workstations, with their vast array of software and accessories, have revolutionized the industry. By using general-purpose computers, the instrumentation industry directly benefits from the billions of R&D dollars spent each year in the general computer market.

    Most VXI users would prefer to use an industry-standard computer provided by a computer vendor rather than a VXI-specific computer provided by an instrument vendor. In fact, for VXI to truly become the platform for the next millennium, it must align itself with the powerful general computer market. Then VXI can take advantage of the billions of dollars being spent and bring this investment to bear on the needs of the instrumentation community. VXI must be able to take full advantage of industry-standard PCs with PCI, EISA, and ISA, as well as workstations from Sun, HP, and others. VXI also must have a transparent mechanism for extending to multiple mainframes, and a way to accommodate instruments that cannot physically fit on a VXI module. MXIbus meets each of these needs.

     The Need for MXIbus

    Today’s market demands that you add value to test and measurement systems. You need modular testing systems that can evolve with technological innovations in the industry. You want increased data throughput and the utmost in computing power; you want flexible, high-speed connectivity between multiple VXI/VME mainframes; and you want to be able to keep up with innovations in PC and workstation technology. Today, sophisticated I/O architectures such as PCI are accelerating data throughput – who knows what tomorrow may hold. How can you take these benefits both now and in the future? The answer is MXI.

    MXI provides you with a solution that combines the performance benefits of an embedded VXI computer with the flexibility of a general-purpose desktop computer. Our VXI-PCI8000 controller and our next generation MXI-2 provides you with an ultra high-performance VXI connectivity solution that can meet your needs both today and well into the future. Although traditional connectivity solutions have proved to be very effective, they also have proved to be the bottleneck in VXI test systems because the software protocol overhead associated with these methods significantly reduced the achievable throughput on the link. Using MXI, this bottleneck is eliminated altogether because MXI devices are connected at the hardware level by mapping each physically separate system into a shared memory space. Physically separate devices transparently share resources through simple reads and writes to the appropriate address in memory. Our next generation MXI-2 products enhance VXI connectivity by defining a single memory-mapped backplane-on-a-bus that can transparently extend bus-level I/O, VXI triggering, interrupts, and systems clocks between systems. You can now use a single cable to conveniently share trigger and timing information between mainframes in a multiple mainframe configuration. The MXI 2.0 specification also defines a synchronous data transfer method that increases MXIbus throughput for block data transfers. From a system standpoint, this means that MXI throughput rates can easily keep up with the data rates of high-performance computers, peripherals, and instrumentation . From a user standpoint, this translates to increased performance and reduced time to test. By choosing a PC-based MXI approach, you are choosing to add value to your VXI instrumentation systems by using technologies that make sense from both a cost and performance perspective.

    MXIbus Applications

    You can use MXIbus for a variety of applications. You can interface industry-standard desktop computers to VXIbus or VMEbus; you can create multiple chassis configurations using our VXI-MXI or VME-MXI extenders; and you can integrate VXI and VME chassis into the same test system.

    Figures 5 and 6 show two common configurations with MXIbus.

    How Does MXIbus Work?

    MXIbus is a general purpose, 32-bit multimaster system bus on a cable. MXI interconnects multiple devices using a flexible cabling method similar to GPIB, but uses a hardware memory-mapped communication scheme that eliminates the software overhead. MXI devices can directly access each other’s resources by performing simple read and writes to appropriate address locations. The new MXI-2 standard expands on the MXI-1 standard by exporting all VXI backplane signals such as VXI-defined trigger lines, interrupt lines and system clocks, in addition to the standard MXIbus signals directly to the cabled bus. MXI-2 users can accomplish critical timing and synchronization tasks between up to eight, daisy-chained MXI devices.

    MXI device connectivity is accomplished at the hardware level. The MXI cable serves as a transparent link that interconnects multiple MXI devices. These devices are interlaced by mapping together portions of their individual address spaces so that a system composed of multiple devices behaves as a single system with a shared address space. Figure 7 shows the MXIbus hardware memory-mapped communication. The immediate benefit of this approach is increased data throughput due to the absence of software overhead.

    Each MXIbus hardware interface has address window circuitry that detects internal (local) bus cycles that map out to the MXIbus. In addition, this circuitry also detects external (remote) MXIbus cycles of connected devices whose addresses map into the shared memory space of the overall system. When a hardware write or read occurs with an address that maps across MXI, the MXI hardware interlocks the bus cycle between the devices via the MXIbus. This hardware scheme is the same as that used by embedded VXI controllers.

    MXIbus signals include 32 multiplexed address and data lines with parity, address modifiers for multiple address spaces, single-level multimaster prioritized bus arbitration, a single interrupt line, a bus error line for handling timeouts and deadlock conditions, and handshake lines for asynchronous operation. Data transfers of 8, 16, and 32 bits are possible, as well as invisible read/write operations and integrated block-mode transfers. With synchronous MXI, the MXI-2 product line can achieve burst data rates as high as 33 Mb/s, and sustained throughput rates exceeding 20 Mb/s, regardless of the length of the MXI-2 cable

    MXIbus Cables

    A single MXI cable can be any length up to 20 m. Up to eight MXI devices can be daisy chained on a single MXI cable length. If multiple MXI devices are daisy chained together, the total cable distance must be no more than 20 m. The MXI-1 cable is a flexible, round cable similar to a GPIB cable (about 0.6 in. in diameter). Internally there are 48 single-ended, twisted-pair signal lines. MXI-2 features an improved cabling scheme that uses a single double-shielded cable between all devices, and a single high-density, high-reliability 144-pin connector per device. In this fashion, all MXI-2 devices share not only the MXIbus itself, but also the VXI-defined trigger lines, interrupt lines, systems clocks, and other signals that were available on MXI-1 products as an optional second connector and cable (INTX). MXI-1 products use an MXI-1 cable between devices, and an optional INTX cable to share trigger/timing information between mainframes in a multiple mainframe configuration. MXI-2 eliminates the need for an additional INTX cable in your system. Because of the cable differences, you cannot mix MXI-1 and MXI-2 products in the same system. Both MXI-1 and MXI-2 use double shielding with an aluminum mylar shield as well as a copper braid shield to eliminate any EMI problems, and both cables meet the National Electric Code (NEC) CL2 fire safety code. The stacking depth of two daisy-chained MXI cables is approximately 3.3 in.

    MXI is essentially a backplane bus in a cable. Each MXI signal line is twisted with its own ground line. All MXI signal lines are matched impedance to minimize signal skew and reflections. Stub lengths no more than 4 in. off the mainline interconnection minimize reflections due to impedance discontinuities. Termination networks, configured with onboard jumpers, are located at the first and last MXI devices to minimize reflections at the ends of cables.

    MXI uses state-of-the-art, single-ended, trapezoidal bus transceivers to reduce noise crosstalk in the transmission system. Designed specifically for driving backplane bus signals, these transceivers have open-collector drivers that generate precise trapezoidal waveforms with typical rise and fall times of 9 ns. The trapezoidal shape, due to the constant rise and fall times, reduces noise coupling (crosstalk) on adjacent lines. The receiver uses a lowpass filter to remove noise and a high-speed comparator that recognizes the trapezoidal-shaped signal from the noise.

    Performance Issues MXIbus Performance

    It is often difficult to understand how a performance specification for a single component relates to the overall performance of your system. In the case of MXI, it is important to understand not only the performance issues associated with the MXI link, but also the devices that communicate across the link. MXI works like an embedded computer, using a direct hardware memory-map to eliminate software overhead between your computer and the VXIbus or VMEbus. Both MXI and embedded VXI computers can use shared-memory communication protocols and direct register accesses for potentially dramatic performance improvements over GPIB. If your VXI instruments themselves do not use these capabilities, however, your system performance using MXI or an embedded computer may be no higher than a GPIB-controlled VXI system.

    There are several factors to consider when comparing an MXI-equipped computer to an embedded computer. An MXI-equipped computer is functionally equivalent to an embedded computer. In fact, application software developed on a MXI computer using NI-VXI/VISA bus interface software can easily run on an embedded computer and vice versa. There are subtle hardware timing differences, but there is no dramatic performance difference due to architecture. MXI, for example, can take roughly 100 ns more to perform a single VXI read or write than an embedded computer, because the MXI signals must propagate down the MXI cable at 10 ns/m. This subtle detail is measured in ns, and is negligible compared to the other factors that affect your system performance, such as the execution speed of your application software or your instruments.

    Often, the most important performance issue to consider when evaluating a computer for your system is the performance of the processor itself. Most applications spend much more time computing, displaying, or performing disk I/O than actually performing I/O across the VXIbus or VMEbus. Current external MXI computers are more than four times as fast as the fastest embedded VXI computer. In addition, because of the physical space constraints of embedded computers, external computers often have much more sophisticated architectures with faster processors, cache RAM, faster disk drives, and other benefits. Raw computing power can be the single most important consideration for the performance of your system.

    Data Transfer Rates

    A common benchmark for VXI computers is the Block Data Rate. This benchmark is easy for vendors to isolate and measure under ideal conditions. It is important to understand what Block Data Rate means to your application. Block Data Rate is the rate at which you can move a large block of data to or from memory on an ideal VXI device using back-to-back VXI transfers. It does not measure how fast the computer can process the blocks of data or store them to disk once they are moved, or whether your instruments themselves can actually match that data rate. Most applications are not limited by the Block Data Rate of the VXI interface hardware, but rather by the total time required to both move and handle the data, or by the rate at which the instruments themselves can generate or accept the data.

    Block Data Rate is easy for vendors to specify, but often difficult for users to relate to overall system performance. It is only one of many elements that affect the actual throughput of your system. For example, Block Data Rate does not indicate the processing power of your computer or the performance of the instruments themselves. In addition, a benchmark for Block Data Rate does not measure how fast you can control instruments using VXI Word Serial Protocol or random VXI reads and writes. The speed for Word Serial communication and random VXI reads and writes is dependent on the speed of the processor and the particular VXI instruments.

    Local Performance

    The MXIbus does not degrade the performance of the devices connected to it. Each MXI device can operate internally at full speed in parallel with other MXI devices. Because MXIbus is a true system bus with multimaster arbitration, the only time MXI devices must synchronize their operation is when they perform transactions that map across the MXIbus. When one MXI device performs a read or write that maps to a remote MXI device, the MXI hardware on both devices interlocks the bus cycle across the MXIbus to accomplish the transfer.

    MXI – An Open Standard

    The MXIbus specification was developed by National Instruments and announced in April 1989 as an open industry standard. A VXIplug&play core technology, MXIbus has been endorsed by the entire VXIplug&play Systems Alliance, including Tektronix, Hewlett-Packard, Racal Instruments, and GenRad. Because MXI is an open standard documented with a comprehensive specification, anyone can develop products that will be integrated into an MXI controlled system.



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