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Where the Cloud Touches Down: Simplifying Data Center Infrastructure Management

Thursday, July 25, 2013
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In most data centers, DCIM rests on a shaky foundation of manual record keeping and scattered documentation. OpManager replaces data center documentation with a single repository for data, QRCodes for asset tracking, accurate 3D mapping of asset locations, and a configuration management database (CMDB). In this webcast, sponsored by ManageEngine, you will see how a real-world datacenter mapping stored in racktables gets imported into OpManager, which then provides a 3D visualization of where assets actually are. You'll also see how the QR Code generator helps you make the link between real assets and the monitoring world, and how the layered CMDB provides a single point of view for all your configuration data.

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Thursday, August 8, 2013
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This webinar will help attendees understand the overall concept of SDN and its benefits, describe the different conceptual approaches to SDN, and examine the various technologies, both proprietary and open source, that are emerging. It will also help users decide whether SDN makes sense in their environment, and outline the first steps IT can take for testing SDN technologies.

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Wireless Broadband and Other Fixed-Wireless Systems

By Peter Rysavy  Our appetite for bandwidth is insatiable. And now, just as wireline modems are topping out at 56 Kbps and ISDN service is finally available in most locations, new technologies, such as DSL (Digital Subscriber Line) and cable modems that offer transmission speeds of megabits per second, are beginning field trials. Meanwhile, old standbys, such as corporate T1 connections at 1.54 Mbps, are being upgraded by many companies to T3 fiber connections. But as quickly as LECs (local exchange carriers) and competitive access providers lay new fiber, many companies are finding high-bandwidth connections difficult to obtain or prohibitively expensive. Wireless has always been an alternative for high-speed connections, but never has the range of choices been as great nor the rate of innovation as rapid. This chapter delves into the world of wireless broadband and other fixed-wireless connections that deliver data rates from T1 to 155 Mbps. These wireless connections serve the same function as a wireline-- interconnecting private networks, bypassing a local exchange carrier or connecting to the Internet.

In our first chapter on wireless networks (http://www.networkcomputing.com/netdesign/wireless1.html), we examined wide-area wireless networks, covering data over PCS (personal communications systems), packet data networks and Metricom Ricochet. In our second chapter, we surveyed wireless LANs (http://www.networkcomputing.com/netdesign/wlan1.html). Both chapters concentrated on mobile computer communications. This chapter focuses on communications that are fixed and at higher data rates. A simple form of such a system might involve a private microwave point-to-point connection; a more complex system might involve a carrier that has deployed a complete network using sophisticated point-to-multipoint hubs. A LEO (low-earth-orbiting) system of satellites would be even more complex. There are as many variations in high-speed wireless systems as there are variations in wireline systems.

Fixed-wireless systems have a long history. Point-to-point microwave connections have long been used for voice and data communications, generally in backhaul networks operated by phone companies, cable TV companies, utilities, railways, paging companies and government agencies, and will continue to be an important part of the communications infrastructure. Frequencies used range from 1 GHz to 40 GHz. But technology has continued to advance, allowing higher frequencies, and thus smaller antennas, to be used, resulting in lower costs and easier-to-deploy systems for private use and for a whole new generation of carriers that are planning to use wireless access as their last mile of communication. The terms wireless broadband and broadband wireless are not used consistently, but generally both apply to carrier-based services in which multiple data streams are multiplexed onto a single radio-carrier signal. Some vendors also use the terms to refer to privately deployed networks.



(A backhaul connection is a company's internal infrastructure connection. For example, a phone company's backhaul might be from one central office to another.)

The goal of this chapter is to show how fixed-wireless systems are no longer a communications tool restricted to large or specialized organizations. They are available to almost any size company in a variety of ways for a variety of purposes. Youčll find that you have a wide range of choices, including whether to use licensed or unlicensed spectrum, whether to deploy a private network or use a carrier network, and whether to use a terrestrial network or a satellite network. In some cases, you may not even know that your service provider is using wireless technology. This chapter discusses the options available, how the various technologies work and how to go about implementing a fixed-wireless solution.


TOC

Broad Fundamentals

 Fixed-Wireless Applications

 Wireline versus Wireless

 Private versus Carrier

 Unique Aspects of Wireless

 Radio Spectrum


Types of Fixed-Wireless Systems

 Private Licensed Links (Microwave)

 Private Unlicensed Links (Spread Spectrum)

 38-GHz Carrier Service

 LMDS (Local Multipoint Distribution Service)

 Satellite Systems

 And the Rest


Using Fixed-Wireless Systems

 Choosing Between Wireless and Wireline

 Understanding Geography and Climate

 Choosing Between Private and Carrier

 How To Deploy a Private Connection

 How To Use a Wireless Broadband Carrier

 When To Use Satellites


Service and Equipment Providers

 Microwave Products

 Unlicensed Wireless Bridges

 Wireless Broadband Carriers

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