An Integral Part of the Simulation, Design, and Manufacturing Workflow

When the simulation experts in an organization turn their models into applications, the overall simulation, design, and manufacturing workflow improves. The simulation expert no longer has to rerun the same or slightly different analyses for other collaborators or customers and the organization can spread the advantages of simulation to a larger group of people. To build their own computational applications, your simulation experts need COMSOL Multiphysics® with its built-in Application Builder. To make these applications accessible to many people at a fraction of the cost, your organization needs COMSOL Server™.

Each simulation application has its own customized user interface, where the application creator can control the inputs and outputs that the application user can apply and manipulate. Experts create these apps by including only the parameters relevant to the design of a specific process or product. This better transfers the simulation expert’s knowledge and experience to the people involved in the design and manufacturing processes across all engineering disciplines in an organization — even those without prior simulation experience.

The simulation expert brings theoretical knowledge and the power of simulation to the optimization of a design or process. Other project stakeholders can then bring their own experiences of building or operating these designs and processes to the overall workflow by using the simulation application and, potentially, providing feedback to the simulation expert aruba acdx.

To make such an augmented workflow a reality, the applications need to be easy to distribute, access, and run. COMSOL Server™ is the product for deploying applications and bringing them to the hands of colleagues and team members. It is also the hub for managing many different applications over multiple functions or operations in an organization.

Scale Your Computational Resources and Easily Maintain Applications

COMSOL Server™ has exactly the same computational demands per user as COMSOL Multiphysics®. Through applications, COMSOL Server™ gives users access to the same powerful simulation technology that is found in COMSOL Multiphysics®.

All users logged into the COMSOL Server™ product can run applications on the computer where it is installed. Alternatively, the load can be distributed by installing COMSOL Server™ to run applications on multiple computers. In that case, one computer is set as the primary server for handling user account and access management, and a series of other computers are used for computations, called secondary servers. It is also possible to have multiple sets of primary and secondary servers, all controlled by a single license manager, which is useful if you have teams that want to only use the computational resources that are allocated for them.

When a user runs an application via the web browser or COMSOL Client, their own computer or mobile device does not need to perform the multiphysics calculations. These can all be done on the server computer(s). Since you are controlling the access and use of applications through a centralized hub, any changes or updates you make are immediately available to all users. You can run up to four application sessions per concurrent user.

By using cluster computing technology with COMSOL Server™, it is possible to configure applications to run on a variety of cluster architectures. For applications designed to distribute the computational workload, computations can be run in parallel for large parametric sweeps or large models. A COMSOL Server™ license is enabled out-of-the-box for an unlimited number of cores and compute nodes without extra licensing fees.

How to make your internet work faster at home. Wi-fi or cable?

The quality of real-time video events, such as interactive music masters courses, will improve at Columbia University as a result of a new, high-speed network known as the New York Dark Fiber Network. This is just one example of the benefits of the private network for Columbia and other research, education and medical institutions in New York, which now have state-of-the-art connections to each other and to the Internet and the Internet 2.

In addition to creating faster and more reliable connections, the dark fiber network increases the efficiency and flexibility of institutions' computer networks. In Colombia, the new technology essentially doubles the capacity of its commercial internet service from 155 Mbps (megabits per second) to 300 Mbps; improves its flexibility in the future acquisition of network technology; and provides greater security of network connections in the event of critical infrastructure damage. The network is called "closed fibers" because no telecommunications operator "illuminates" it with its equipment; instead; Columbia "lights up" its fiber yarns with its own equipment, just as it does for fiber cables on nearby and nearby campuses.

The network was built in the last two years by a consortium of institutions in the area, all members of New York, based in NYSERNet, the state education and research network in New York. The Presbyterian Hospital in Columbia and New York played an important role in the project. Other founding members include the American Museum of Natural History, City University of New York, Mt. Sinai-NYU Medical Center and Weill Cornell Medical College. Additional institutions are expected to join to take advantage of the higher service, and the project has expanded to the Bronx. Finally, similar services may include other cities and Long Island.

The network has already benefited Columbia by connecting Columbia University Medical Center (CUMC) in Washington Heights and several CUMC and New York Presbyterian Hospital locations throughout Manhattan to each other and the other participating institutions, as well as the Internet dark fiber cost.

In addition, unlike telecommunications carrier services, which have costs that vary with speed, the price of fiber is fixed, while its capacity is virtually unlimited. "Owning fiber strings will allow us to choose and afford new network technologies as they grow, rather than wait and then pay someone else for better networks," said Alan Crosswell, director of the Columbia Network and Computing systems, adding that the new network allows the University to have the flexibility to implement "future fiber-based technologies that have not yet been developed."

F5 Network Certification Guide: Overview and Career Pathways

Many of us had to come to terms when an F1 or F2 tornado passed through the area, smoothing out most things in its path, but F5? The most powerful tornado speed on the Fujita scale was also the inspiration for the name F5 Labs, which appeared in 1996 and is now known as F5 Networks. Initially offering its products for load balancing BIG IP servers, F5 has expanded to provide an optimization technology called Application Delivery Network (ADN). ADN stores servers, network resources, and the like in data centers and in the cloud around the world.

Headquartered in Seattle, Washington, F5 serves virtually every Fortune 50 company, as well as a long list of mid-sized and corporate organizations. Over the years, the company's revenues have grown significantly, with annual revenues exceeding $ 2 billion. F5's growth continued in 2017 as revenues exceeded $ 2.1 billion. The continued growth has attracted the attention of Wall Street and potential investors as well as companies looking for a profitable acquisition or merger. In fact, F5 Networks seems to be looking at offers from potential buyers.

The F5 Networks certification program is small and focused. It offers IT credentials that help prepare people to develop, deploy, and support company products and solutions. The three certifications in the F5 program include the following items: f5 big ip

F5 Certified BIG-IP Administrator (F5-CA)

F5 Certified Technology Specialist (F5-CTS)

F5 Certified Solutions Expert (F5-CSE)

To get started, F5 certification candidates must register with the F5 Credential Management System (F5-CMS), submit an applicant agreement form, and complete a nondisclosure agreement. Once registered, the tutorial for the desired certification becomes available through the company's system, although tutorials are also available outside of F5-CMS as you will learn later in this article. All F5 certification exams cost $ 135 and are available through Pearson VUE.

F5 Certified BIG-IP Administrator (F5-CA)

An F5 certified BIG-IP administrator can manage Application Delivery Networks (ADNs) and perform routine management and troubleshooting of F5 Traffic Management Operating System (TMOS) devices. F5-CA certification requires two exams:

Exam 101 - Application Delivery Fundamentals

Exam 201 - TMOS Administration

These exams must be taken in numerical order as the TMOS Administration exam is a prerequisite. Before taking the exam, F5 offers candidates a solid understanding of networking concepts and protocols, traffic shaping concepts and TMOS components, and how to work with virtual servers.

F5 Certified Technology Specialist (F5-CTS)

F5 Certified Technician credentials come in four flavors, focusing on traffic management, DNS, security and access policies. First LTM exams (Exam 301a) for DNS, ASM, and APM specialist credentials take Exam 201 - TMOS Administration as a prerequisite. The second LTM exam - LTM Specialist: Maintenance and Troubleshooting (Exam 301b) - requires prior completion of the LTM Specialist: Architect, Configuring, and Deploying Exam 301a. To obtain the F5-CTS, candidates must pass one or two exams, depending on the specialty chosen:

Local Traffic Manager (LTM) : LTM credentials recognize professionals who work with advanced F5 products from design to implementation and maintenance and understand how to integrate LTM into existing networks. Two exams are required:

Exam 301a - BIG-IP LTM Specialist: Architect, Configuration, and Deployment

Exam 301b - BIG-IP LTM Specialist: Maintenance and Troubleshooting

Domain Name Server (DNS): DNS credentials are intended for application delivery architects and application delivery engineers working with BIG-IP DNS. Only one exam is required to obtain this certification:

Exam 302 - BIG-IP DNS Specialist

Application Security Manager (ASM) : ASM develops, implements, and maintains ASM to secure application delivery networks. Applicants should understand the interactivity between ASM and web applications, troubleshooting techniques, and the integration method. Only one exam required:

Exam 303 - BIG-IP ASM Specialist

Access Policy Manager (APM) . An APM-authorized person manages the application delivery networks and technologies that run on the F5 TMOS operating system. Applicants should understand remote access, authentication and authorization, and how to install, maintain, and update APM. To qualify for APM, candidates must pass one exam:

Exam 304 - BIG-IP APM Specialist

Anyone with the desire (and time) to complete all four CTS exams should seriously consider moving to the F5 Certification - F5 Solutions Expert.

Linux System Administrator (Asterisk)

Lanet network is one of the largest Internet and cable TV providers in Ukraine.

We are now looking for a Linux system administrator .

The work is challenging, creative and interesting. It combines elements of system administration of Linux OS and Asterisk PBX, as well as programming in Python (PBX).

Duties: linux jobs near me

support and development of a geographically distributed enterprise telephony system and a contact center based on Asterisk (SIP, PRI, GSM);

support and development of related services (self-written FastAGI-server, AMI, ARI, auto-dialing scripts, control system for GSM-gateways, etc.);

analytics and troubleshooting of SIP traffic;

support and development of self-written front-ends and other add-ons over the PBX (operator's workstation, call analysis and contact center management tools, etc.).

Requirements:

2+ years of Linux experience;

2+ years experience with pure Asterisk PBX (without FreePBX and other front-ends);

knowledge of AEL, experience in developing comprehensive recruitment plans; knowledge of RTP / SRTP, SIP TLS;

confident knowledge of RedHat Linux (and analogues), working in the console, system utilities and services, building software from source codes;

experience working with MySQL at the query level;

experience with GSM, FXO / FXS gateways;

basic knowledge of PHP, JS (JQuery), HTML, CSS, Python will be a huge plus;

English at the level of understanding technical documentation;

ability to document your work.

Cisco CCNA About Switching and Wireless LAN

The target audience

Students who have completed the training will be able not only to get a theoretical base, but also to learn the skills necessary for further work in practice. Also, students can directly contact the trainers and count on the help of the curators.

Purpose of the event cisco wireless certified

Cisco International Academy offers training (courses) Cisco Kiev on the specialization of "Switching and Wireless LAN". Obtaining the certificate of this learning platform based on SEDICOMM University will prepare you for the CCNA industrial certification exam. Professional lecturers will give you all the knowledge you need for successful employment.

Program

The training is equally well suited for beginners and those who have built a career in the IT field.

Features of the training program

Regardless of the basic training of the student, Cisco training (courses) Kiev will help deepen existing knowledge or learn specialization from scratch. They will tell in detail about:

LAN design;

configuring the switch;

VLANs and routing between them;

implementation of VTP;

Spanning Tree implementations

setting up a wireless router.

All Kiev training (courses) Cisco are conducted online. Lectures are held twice a week.

Additional Information

You don't need to study for several years to get a high-paying job in an international company. It is enough to pass trainings (online courses) Cisco Kiev at the Cisco Academy. After studying all the necessary materials and passing the exam, each student is guaranteed employment. You can change your life for the better now!

Each student gets access to multimedia study guides that will deeply study the necessary material. According to statistics, 100% of trained students receive prestigious positions. Detailed information can be obtained on the official website of the online university.

The device and principle of operation of a fiber-optic cable

How optics work. Device and principle of operation.

Optical fiber data transmission is carried out using light - as you know - one of the fastest matter in the universe. the electrical signal of the copper cable passes through a special converter and turns into light. Each fiber optic is like a glass tube in a mirror tube. ( Polymer of different density. For example 9/125 microns ) Light, penetrating into it, is reflected from the junction of the vein boundaries and flies farther and farther. At the end of the journey, it is received by the receiving device and converted back into an electrical signal fiber splicing job.

However, fiber optic data transmission is slower than the speed of light (~ 1 billion km / h). This is because microlasers used to transmit light through optical fibers do not produce light at that speed. And also due to losses due to refraction of rays.

The decay rate of the signal in the fiber differs depending on the type of fiber. So a multimode cable ( 50/125, 62/125 ) allows you to transmit a signal for 2-3 kilometers without significant losses. Singlemode cable ( 9/125 ) - works at a distance of up to 10 km. Most likely, a lot depends on the material used in the manufacture of cables. The lengths shown are for modern polymer cables. Most likely, a core of a denser material will allow light to be transmitted over longer distances. Also, it all depends on the signal source. Accordingly, the more powerful it is, the further the light will "fly".

fiber optic cable

What is fiber optic for? The advantages of an optical cable.

Fiber optic is used in many industries - as well as in everyday life. First, the optical cable is a dielectric, which makes it safe for data transmission in oil refineries and other explosive sites.

Secondly, for the same reason, optics accumulate very little static electricity. The values ​​are so small that they are not even taken into account. Accordingly, fiber optic cables can be used in networks at various high voltage facilities.

Fiber optic cables can be laid in water, in the ground in an aggressive environment - using special sheaths. However, the main purpose of optics is to transmit data over long distances.

On the border of the possibilities of an optical cable, a special device is installed - a repeater, which increases the distance by another length. When connecting optical fibers, optical couplings are used in which the fibers are spliced ​​together.

Now, with the cost of a meter of optics equal to the cost of a twisted pair, we can talk about the construction of networks entirely on it. But this does not mean that its installation can be entrusted to low-skilled installers.

Fiber optic cable laying and installation.

Usually, in any company that installs cable optical networks, a separate team, or even a whole department, is engaged in designing the installation of optical networks. This is due to various features of the installation of optics.

For example, an optical cable cannot be bent at angles less than 110-120 degrees. It is advisable to install optical fiber in a corrugated pipe - due to the low strength of a conventional optical cable. It is not difficult to break it.

Most often, the optics are laid in a separate channel. And so on - there are quite a few such subtleties of work when working with such cables. In addition, the fiber optic connection method and termination deserves a separate section.

The cable is terminated with special connectors - connectors. There are several types of them.

types and types of optical connectors

Fiber optic cable welding

To connect ( weld ) optical cables, you need a special expensive device - a welding machine. The cost of a quality device starts from 150,000 rubles. Now the market is flooded with inexpensive Chinese solutions for 30-40 thousand rubles, but the use of such devices produces low-quality connections. In addition, such devices quickly fail.

Hyperconvergence is the future of data centers

IT budgets in organizations typically do not grow as fast as the requirements for the speed of deploying new applications and expanding existing ones. The solution is to redirect attention and human resources from the details of data center implementation to the applications themselves, which are closer to business. This can be done in several ways, and a public cloud that saves costs (not only) through economies of scale can be one of them.

When you look for the number and volume of technology company acquisitions, Cisco ranks second in both categories, number one in volume (1991-2018). Not surprisingly, it is often possible to hear the misconception that acquisitions are the only way for Cisco to secure evolutionary benefits in technology armaments.

The "California" or "Unified Computing System" (Cisco UCS) project is a product of Cisco's rich internal development. Hyperflex is another stage of development of the new architecture, which began in 2009 and completely changed the architecture of data centers cisco one data center.

The concept of architecture is crucial here, because UCS is not "another server from Cisco", but a system based on the idea of ​​"Stateless computing". It abstracts the configuration of the server and its LAN and SAN connectivity from the hardware. The content of the term server in this case is not something physical, but a complete definition of the configuration, including unique identifiers such as MAC, WWPN, UUID, zoning and others in the tool "UCS Manager".

UCS Manager is home to flash memory in a device called Fabric Interconnect, which is not only the center of management for up to 20 chassis or 160 servers, but also the central link for LAN and SAN connectivity. If you know the Nexus family of data center switches, then you can start from a simple equation: UCS Manager software + Nexus hardware = Fabric Interconnect.

The counterpart of Fabric Interconnect in the blade server is the Cisco VIC (Virtual Interface Card) and IO module, which not only take care of connectivity, but also integrate the management of the relevant part of the solution. The chassis of the UCS therefore only serves for power and cooling, which means that it lasts a really long time.

Should UCS Manager, with its clear and fast HTML5 interface (or perhaps an API?) Be an insufficient tool for you, you can solve your demands for managing multiple data centers with UCS Central. Alternatively, you can also use UCS Director if you are building a cloud-like environment and require a very high degree of automation.

Yes, the physical server is what we pay the least attention to in Cisco's server solution, everything interesting has moved to the software. The great thing is that you can try UCS without having to buy it, just download the UCS Platform Emulator.

How from UCS to hyperconvergence (HCI)?

Hyperconvergence is usually defined by the integration of compute, network, storage, hypervisor parts of the data center and, above all, their management from one place. This definition is not entirely clear and is therefore interpreted differently.

Does the compute and management part include, for example, the firmware of individual server components, in other words, I would like a simple solution for rolling upgrades of all components? Does the network part include physical networking, not just software? Storage also includes configuring the access of a hyperconverged solution to my existing storage, so I want the solution to be integratable with the existing infrastructure and not create another separate force?

And what about manufacturer support? Does it make sense for me to have a single point for such a solution, where will I turn with all the problems, without managing cases and ensuring communication from more than one manufacturer? In my opinion, the answer to all four questions is unequivocally yes.

Hyperconverged solutions integrate the above to save us time and human resources. The administration department, albeit only a few parts, goes against this principle. Some manufacturers highlight a purely software solution - that is, you can use any element as the underlying hardware. If you go this route, the customer or partner is responsible for performance and compatibility. But how to ensure compatibility and the necessary performance? Ha! I will use validated solutions, but this narrows the term "arbitrary" somewhat. In addition, it does not solve all these problems by far, and so we get to a certain extent again to the disadvantages of converged data centers.

Of course, different approaches may suit different customers, and the single best probably doesn't exist. As you may have guessed, Cisco has taken a different path in meeting those who demand maximum simplicity, and the answer to these HCI requirements is Cisco Hyperflex.

UCS combines computer, networking, and management - Cisco is the only vendor to integrate physical networking into HCI. The same is true for Hyperflex, we only lack storage that is provided by HX data platform software, which is a distributed scale-out file system developed specifically for Hyperflex:

Out-of-box allows fast clones, instant creation and deletion of snapshots without affecting performance

Compression and deduplication on small blocks. This makes this file system highly space efficient, and if you require the maximum amount of compression, these calculations can be accelerated by FPGA cards.

Data overwriting uses available free space and is written when there is enough data to write to reduce the number of IO operations and increase performance.

No need to move data when migrating VMs, the file system is designed so that any node can read from any part of storage without losing performance

It uses the fastest possible access to writes, data is captured and distributed immediately, not after being written to the local node

Optional 2 × or 3 × replication factor

Automatic repair, tracking and rebalancing

HX Data Platform is therefore a modern file system, directly designed for hyperconvergence. In addition, it does not require the use of only converged nodes. If you do not need more space, but only computing power, only compute nodes can be extended.