Huntsville, Alabama (Nasdaq) 22 December 2011

Digium

?, Inc., the asterisk? Company, today announced that Switchvox? experienced growth of 40 percent in 2011, the result of the ongoing global launch of Unified Communications (UC). Digium Switchvox is Voice over IP (VoIP) phone system for small and medium enterprises (SMEs) to join the company and enables collaboration through integrated calls, mobile, instant messaging and conferencing, all designed this for an affordable price.

to other business systems for telephony over Digium offers the best return on investment (ROI) in the industry. Customers often buy Switchvox save up to 60 percent or more of your initial investment and up to 80 per cent in the total cost of ownership over five years, compared to the competition. The results show that Switchvox all functions and features of enterprise class IP PBX platform at a fraction of the cost is available. Frost & Sullivan recognizes Digium as the best value in systems with mobile UC Award for Best Customer Value In 2011 the University of California, North America.

seen tremendous traction in the market for small and medium-sized enterprises because they have been providing our customers the best value in all areas of business telephone systems, said Leslie Conway, vice president of global marketing for Digium. Switchvox solutions enable these organizations to work where and how they work, to integrate support for remote and mobile workers. Our customers can rest more with the phone system can work together to integrate the third-party business applications, easily, and then do their businesses more efficiently.

published in 2011, a major upgrade of its products Digium Switchvox includes several enhancements, allowing greater mobility of workers. Switchvox 5.0, Fixed Mobile Convergence (FMC), allowing users to integrate Switchvox with any external phone. With FMC, users can burn or calls from anywhere that seemed to have been in his office. Digium Switchvox presented to the inquiry Mobile for Android devices that the existing support for iPhone and Blackberry. The mobile applications are fully integrated into a system of Switchvox phone users, allowing users to call directly from your camera and other features Switchvox user key from these mobile platforms at no additional cost. Digium also adds improved reporting and management features that extend the capabilities of the APIs that offer administrators more flexibility to adapt and integrate applications with Switchvox Switchvox. All these features are available for customers with current subscriptions Switchvox without additional cost or licensing.

Furthermore, 2011 was an exciting year for Digium’s channel program. To better meet the growing market with Switchvox SMB, Digium nearly doubled number of its channel partners worldwide. The company expanded its online training and certifications, and added, inside sales teams and local support. This commitment to the channel receives back into the Digium Partner Program CRN prestigious Five Star Partner Program led.

Besides the awards program partners has been Digium .** Gartner, Inc. in the Magic Quadrant for Corporate Telephony Magic Quadrant * and for Unified Communications report, the Switchvox solution was added premium application was awarded CRN Magazine Business, Frost & Sullivan Customer Value Award for the improvement of the University of California in the United States, Internet Telephony Excellence Award from Unified Communications TMC Labs Innovation Award and the Excellence Award from Internet Telephony. Leslie Conway, vice president of global marketing, CRN Power 100 was called. The most powerful women in the canal in 2011 and Steve Harvey, vice president of sales worldwide was recognized by CRN as Head of Channel

For more information, visit the website at http://www.digium.com/switchvox.

* Gartner Magic Quadrant for Corporate Telephony by Jay Lassman, Steve Blood and Geoff Johnson: September 2011

** Gartner Magic Quadrant for Unified Communications, Bern Elliot, Steve Blood: 22 August 2011

About Digium

Digium?, Inc., the asterisk? Company, created, owns and is the innovative force behind Asterisk, the most widely used open source telephony code. Since its founding in 1999, Digium, the open-source alternative to proprietary communication providers, with offerings that cost as much as 80 percent less. Digium offers Asterisk software free to the open source community and offers Switchvox IP PBX software to power a broad family of products for small, medium and large. The company’s product range includes a wide range of hardware and software to resellers and customers to the turnkey VoIP systems or implement their own design to provide telephony solutions. For more information, see http://www.digium.com.

Digium logo, Digium, Asterisk, Asterisk SCF, Switchvox, Asterisk Business Edition, AsteriskNOW, Asterisk Appliance and the Asterisk logo are trademarks of Digium, Inc. All other trademarks are the property of their respective owners.

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by kainet

LonWorks field bus technology in train control system – bus, train network communications – Electric

Article by jekky

(1042, ‘With the LonWorks field bus network standards have been identified as one of China 39 s train communication network standards field bus technology in the train communication network technologies to get more and more applications In this paper a brief introduction on the basis of field bus technology mainly on the field bus technology to the train network monitoring system status and application method were analyzed br br 1 Introduction With the continuous development of science and technology and extensive application of various industries more and more evidence that a particular industry or the broader field of unified technical standards more and more important and as a constraint or the promotion of industry Technology development of a very important factor There are also in the railway system the same problem if there is no uniform standard the vehicle system manufacturers often follow their own path to develop a proprietary non compatible interface products to limit the buyer can only use their system products and technologies are not conducive to competition restricted the development of related technologies In the past for a long period of time the railway system train the network Communicate In a non standard technology on the state of the bound train network monitoring system technology In 1999 the train communication network the international development of the two corresponding standard IEC International Electrotechnical Commission to develop a quot train communication network quot and the IEEE USA Electric And Electronic Engineers to develop a quot train the network communication protocols quot The latter range includes the former it provides for two types of train communication network T type and L type T type network that TCN Train Communication Network L type quot free topology twisted pair channel specification quot provisions of LonWorks communications network Reference to the two international standards combined with the actual situation of the domestic railway traction in 2002 China 39 s Ministry of Railways has also developed a corresponding quot The People 39 s Republic of China Railway Industry Standards Train Communication Network quot This standard also provides for two types of train communication network T type and L type Currently the domestic application of the train communication network focused on L type network Used in the railway system open IEEE standard will ensure multi vendor interoperability of products which can help to promote every aspect of supply chain competitiveness accelerate technology development br br 2 The characteristics of network control technology br LonWorks Local Operating Networks Echelon Corporation in the United States in 1991 launched Fieldbus Technology which can solve the control network design composition installation and maintenance of a large number of problems arise br br LonWorks network control technology features 1 Openness open network protocol any user of equality br 2 Interoperability LonWorks communication protocol LonTalk meet ISO International Organization for Standardization OSI definition of open interconnection model Any manufacturer 39 s products can interoperate br br 3 communication media virtually every aspect of the present all the available communications media including twisted pair power lines optical fiber coaxial cable radio waves infrared etc but also in the same network can have a variety of communications media br br 4 network structure can be master slave peer or client server model br 5 network topologies a star bus shaped circular and free form br 6 Communication speed up to 1 25Mb s then the effective communication distance is 130m Using twisted pair case 78Kb s line rate communication distance up to 2700m br br 7 LonWorks network communications using object oriented design methods LonWorks network communication technology called quot network variables quot which simplify the design of the network communication settings for the parameters to increase the reliability of the communication br br LonWorks technology is fully satisfied because the future development of monitoring and control system requirements at present its use has been around the world in 56 countries and regions industrial building transportation Energy And other automation br br 3 LonWorks technology 3 1 Railways Train Communication Network of the L network provides br Standard provides that quot for connecting a basic operation unit a single vehicle or vehicles fixed combination or a group of basic operational unit of the electronic device delivery time is not urgent time is not required to determine the message by the event driven data transmission quot mainly used in train control systems As the train control system monitors the object consisting of a relatively fixed and the special train formation the standard also provides the most commonly used network topology and network bus relations shown in Figure 1 br br Figure 1 Relationship between network structure and the bus br 3 2 Train Network Monitoring System Overview br Many applications in the present the train network monitoring system is mainly achieved on the train running status of all surveillance equipment vehicles and equipment as needed can be controlled remotely control operations These vehicles tend to fixed equipment usually including air conditioning controller auxiliary Power supply Inverter smoke alarm door controllers temperature alarm devices anti skid devices controllers power train the train almost all the necessary electronic equipment System to monitor these devices control variables in both analog and also digital Because the number of trains are often linked to the compilation of more than 18 the number of the whole system more control objects network traffic is relatively large In addition because the situation may change in train formation network monitoring system also must set the device to set the license number and organization on the whole network dynamically configured to adapt to different situations train formation System design in addition to common node designs many train equipment currently used as the traditional micro control technology but also to maintain existing RS 232 485 serial communication system to establish communications with these devices you must install the protocol conversion node Therefore the whole system design and implementation are complex br br 3 3 Application Abroad especially the United States and other Western countries LonWorks field bus technology has been widely used in the railway field European countries mainly TCN br br Domestic train control system currently LonWorks field bus technology is also increasing There has been put into use for the DMU Dawn Shenzhou point to point communication and realizing the important end to end joint control locomotive In the new design of EMU some are used to train bus number of nodes some for the vehicle bus multiple devices Beijing High chartered bus is used in all LON br br Has been put into operation in the current system basically’)

About the Author

I am China Manufacturers writer, reports some information about nas appliance, 2821 cisco router.

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