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   Content Caching and Distribution
 


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Content Caching and Distribution Overview

With the birth and growth of the Internet and high-speed access links, Internet users can enjoy large amounts of web content on the Internet. However, network congestion and server overload have become major concerns for content delivery.

In Cached-Contend Distribution Networks, web content is distributed to cache servers located at the edge of the Internet close to clients, and the cache servers deliver content to clients if they cached the requested content beforehand.

Since the cached content does not have to be delivered from the origin servers to the cache servers, this leads to lower latency for users, better network resource utilization for network operators, and scalable service provisioning for content providers

Content engines can be deployed in the data center or branch offices to optimize WAN bandwidth, accelerate deployment of mission-critical Web applications, add Web content security, and deliver live and on-demand business video.

With the addition of a device such as a Cisco Content Distribution Manager, all caching and content-delivery services and devices can be centrally managed. To redirect users to the best source for content, devices such as a content router can be added.

 

Case Study

This case study applies to a solution that Softech was part of. The customer is a government-related healthcare provider in the United States, with a network of nationwide centers and more than 250,000 employees.

Business Problem: Training Dilemma

Tasked with figuring out how to deliver 40 hours of training annually to each of its more than 250,000 employees around the country, without spending a fortune

Business Solution

The Customer found the answer to its training dilemma in the satellite network it used to provide unidirectional broadcasts to its major medical centers across the country, including Puerto Rico. The Customer had served up four channels of live and prerecorded content, mostly training and news - essentially a private cable TV service - out of an uplink center in St. Louis. It used dedicated bandwidth on PanAmSat's Galaxy 10 satellite

Bandwidth Challenges

Unidirectional broadcasting, in which each user gets a dedicated copy of the video programming, wasn't going to work. Heavily populated network segments would have clogged quickly.

Multicasting, which is inherent in a satellite network, made the perfect solution. With IP multicast, the Customer's Employee Education Service (EES) easily could blast out a single version of a stream or file to each employee needing the training. With IP multicast, a single video stream gets sent to multiple LAN users.

The Customer's IT Vendors and Partners, and its own Network specialists figured the satellite offered them the best means of beaming bandwidth-intensive live and on-demand video content to individual desktops in the hospitals without disrupting the terrestrial WAN.

Video Knowledge and Learning Solution

Once the network infrastructure has been laid, need for a Network aware Learning solution managing content, delivery, user tracking, recording completions, crediting learning credits to the Customer's Employee Databases and User Authentication with the custoemr's Network was identified

A Web Based Knowledge Network ( Video Learning Solution) by Softech Worldwide provided all nuts and bolts to manage ( add, edit, modify) content, deliver live or on-demand content, manage users, provide complete user tracking, keep record of viewing history, crediting history to each employee’s profile over this award winning content delivery network

End Result

The $4.5 million project let the Customer meet federal and departmental training mandates while creating a better-educated workforce and reaping huge cost-savings over alternative methods.

The cached content - a video demonstrating blood-handling techniques, for example - is delivered upon request using unicast. Each content engine can store about 30G/bytes or approximately 60 hours of material at a time, with content rotated in and out by the EES. Users access the available content via a Web interface by Softech Worldwide and view the streams using Cisco's IPTV player or Windows Media.

Savings

Additionally, the Customer can educate its employees on a broader basis. For example, after Customer specialists attended the annual American Telemedicine Association conference, they held an eight-hour seminar in Long Beach, Calif., to share what they learned and related it the Customer's needs.

A single H.320 [ISDN] video call at 384K bit/sec is about $50 an hour, plus some money for the bridge that connects participants. Now, there's no additional cost for all the streaming users.

Overall, the EES expects to get a $25 million return on its investment over the next three years by delivering content directly to users at their desktops