CDN交付类型的研究：HTTP CDN, VoD CDN, Live Streaming CDN

A Look On The Types Of CDN Deliveries

CDN交付类型的研究

HTTPCDN, VoD CDN, Live Streaming CDN

As the demand for online content increases,the demand for a critical technology which can deliver video, huge files, andother web content to users quickly and reliably increases. The delay thatoccurs between the loading of a web page and when the page actually appears istermed to be latency. The latency of a page may be high due to the geographicaldistance between your computer and the hosting server of the web page and nouser can’t wait so long for a content to load and they simply close or navigateto another web application.

随着在线内容需求的增长，对可以快速可靠地向用户交付视频Video，大文件Files和其他Web内容的关键技术的需求也在增加。在加载网页和网页实际出现之间发生的延迟称为Latency延迟。由于您的计算机与网页的托管服务器之间的地理/物理距离，页面的latency延迟可能会很高，并且没有用户可以忍受这么长时间才能加载内容，他们只会关闭或跳转到另一个Web应用程序。

CDN’s are evolved to solve such afundamental problem by accelerating the delivery of content. The cached contenton multiple servers are widely distributed across the geographical locations todeliver a range of content to numerous endpoints swiftly in a cost-effectivemanner.

CDN的发展是为了通过加速内容交付来解决这样一个根本问题。多台服务器上的缓存内容广泛分布在不同的地理/物理位置（CDN节点），以经济高效的方式将一系列内容快速交付到众多终端。

In this article, let’s have a look on howCDN’s work and the types of CDN deliveries based on the user requirements.

在本文中，让我们看看CDN是如何工作的，以及基于用户需求的CDN交付类型。

How CDN Work? CDN的工作原理？

Generally, CDN’s are a large network ofservers. They reduce the physical stretch between a web server and a user byhaving the copies of content pulled from the origin server to spread acrossgeographies in storage banks called caches or PoPs. So when a user from the UStries to access French content it can simply be fetched from a local US PoP,instead of routing the content from France. In the nutshell, CDN’s are great inoffering a superlative coverage to the users, thereby improving the userexperience.

一般来说，CDN是一个大型的服务器网络。它们通过将内容副本从源服务器拉到存储库（称为Caches缓存或POPs点）中分布在不同的地理位置，从而减少了web服务器和用户之间的物理拉伸负担。因此，当来自美国的用户尝试访问法国内容时，可以简单地从本地美国PoP点中获取它，而不需要直接从法国路由内容。简而言之，CDN在为用户提供最高级的覆盖范围方面非常出色，从而改善了用户体验。

Types Of CDN’s CDN的类型

Based on the purposes, CDN deliveries fallinto three categories: General Purpose CDN’s, On-demand Video CDN’s, Live VideoCDN’s. Let’s explore in detail each of the categories in detail.

根据需求目的，CDN交付分为三类：通用CDN，点播视频CDN，直播视频CDN。让我们来详细探讨每个类别。

General Purpose CDN 通用型CDN

General purpose CDN’s took its form beforethe emergence of video and you might have come across a general purpose CDNwhile surfing a popular website or when downloading a software update or whenstreaming a song on YouTube. They drive the web traffic by retrieving cachedcontent from diverse regions. However, web acceleration has become bit complexand highly fragmented as they rely on a large number of servers worldwidefalling along the language lines and country boundaries. The language clustersin a single country can prompt numerous CDNs having the capacity to makeadvances into different parts of the market.

通用CDN在视频出现之前就已经形成了，您在浏览热门网站，下载软件更新或在YouTube上播放歌曲时可能会遇到通用CDN。他们通过检索来自不同区域的缓存内容来驱动Web流量。然而，Web加速已经变得有点复杂和高度分散，因为它们依赖于分布在世界各地不同语言和国家边界的大量服务器。单个国家/地区的语言集群可以促使众多CDN具备进军市场不同部分的能力。

On-Demand Video CDN点播视频CDN

Barely, to curb the number of bits beingdelivered to the user, CDNs would not really like to spend the additional costof hardware and streaming software. Hence the formats direct download,progressive download, and HTTP streaming are evolved.

Barely，为了限制传送给用户的比特数，CDN并不真的愿意花费额外的硬件和流媒体软件成本。因此，直接下载、渐进式下载和HTTP流的格式得到了发展。

• Direct download直接下载

Direct download requires a video to bedownloaded before viewing. However, this turns out to be a time-consumingburdensome process for large applications and movies, while shorter clips canbe downloaded quickly.

直接下载需要先下载视频才能观看。然而，对于大型应用程序和电影来说，这是一个费时费力的过程，而较短的剪辑可以快速下载。

• Progressive download渐进式下载

YouTube is a perfect example of progressivedownload which demands a bit-by-bit download. Here, the viewer can watch a partof the video while the rest being downloaded facilitating concurrent downloadand utilization of the video. Progressive downloads turn out to be moreeffective and practical as the speed of the download that is required todeliver the standard-definition content exceeds the bit rate as the internetspeed increases.

YouTube是渐进式下载的完美例子，它需要一点一点的下载。在这里，观看者可以观看视频的一部分，而其余部分正在下载，从而促进了视频的并发下载和利用。随着互联网速度的提高，传输标准定义内容所需的下载速度超过比特率，渐进式下载变得更加有效和实用。

• HTTP Streaming HTTP流

HTTP streaming technology chokes theon-demand content by dividing it into tiny bits and stream each bit separately.In order to customize a particular stream to a user’s video player, streamingis performed at varying bit rates.

HTTP流技术通过将点播内容分成小块并分别对其进行流式传输，从而扼杀了点播内容。为了将特定流定制为用户的视频播放器，以不同的比特率执行流。

Live Video CDN直播视频CDN

Besides other forms of CDN delivery, livevideo delivery is crucial as the majority of video content delivered by CDNs ison-demand video and live video can’t be cached. Hence the basic CDNinfrastructure took a new form as a live streaming CDNs.

除了其他形式的CDN传输外，Live Video直播视频传输非常重要，因为CDN传送的视频内容大部分是点播视频，live video直播视频无法缓存。因此，基本CDN基础设施采用了一种新的形式，即Live Streaming CDN（直播CDN）。

These live streaming CDN’s can befabricated in two ways

这些直播CDN可以通过两种方式制作

• Low bandwidth pipes utilizing reflectors for accelerating thecontent transmission 

  低带宽管道利用反射器加速内容传输

• Ultra-high bandwidth pipes for instant transmission of content tousers 

  超高带宽管道可将内容即时传输给用户

Live streaming CDN’s are becoming populardespite being costly during peak user views and the cost cannot be adequatelyrecovered as we cannot expect continuous usage. However, live streaming CDN isexpected to rule the sphere by marking itself as mainstream communication.

Live streaming直播CDN正变得越来越流行，尽管在用户浏览量高峰期间成本高昂，而且成本不能被充分回收，因为我们不能期望持续使用。然而，Live Streaming CDN（直播CDN）有望通过将自己标记为主流来统治整个通信领域。

Final Verdict最终裁决

A CDN can fill in as an enchantment fix insmoothening content transmission to your clients. They offer specific benefitsto different types of business sectors such as IT corporates, media,government, finance, e-commerce etc. Get ready to experience a remarkablebusiness experience by integrating CDN to your streaming platform.

CDN可以作为一个迷人的魔性的解决方案，平滑的将内容传输到你的客户。CDN可为不同类型的业务部门（例如IT公司，media媒体，GOV.政府，Finance金融，E-commerce电子商务等）提供特定的好处。准备好通过将CDN集成到您的流媒体平台中，获得非凡的业务体验吧！

FDCservers CDN基于OnApp云计算平台，HTTP 和 Streaming两种EdgeServer边缘服务器。Edge Servers支持以下协议：

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• HDS

• RTSP/RTP

• iPhone

• SilverLight

• MPEG-TS

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