Why Asymmetric Bandwidth is Important to IP Video Systems

Author: John Honovich, Published on Jun 07, 2008

You may notice that your home cable modem offers greater bandwidth going down to your house than going up to the Internet. For instance, while you may have 3 Mb/s download, you can only upload at 384 Kb/s. This is an example of asymmetric bandwidth, a very common and important factor in designing IP Video systems.

Generally, as a home user, this works out fine. Normally, what you want to do is access resources or view materials from remote servers (newspaper websites, iTunes, etc.). The average user rarely needs to upload lots of data/files/video quickly.

This is the opposite when designing IP video systems. With IP video systems, you want to deploy a number of cameras at your remote facilities, stores, branch offices, etc. And usually, you are interested in watching or recording those cameras at your central facility or other facilities. In this case, you are 'serving' video from your remote facility to your main facilities. This is, of course, the opposite of what you usually do, which is receive data/files/video from a main office/server.

As such, you have double design issues. First, bandwidth available to your remote sites is low (usually 5 Mb/s or lower max downstream). Second, upstream bandwidth (the bandwidth you need to serve your IP video) is only a fraction of what the already meager downstream bandwidth is.

And there's no solution to 'asymmetric bandwidth' on the horizon. This is not a minor technical issue. This is a fundamental electrical engineering issue of building shared networks like cable modems and DSL. You can eliminate the asymmetry by buying T1s or DS3s or fiber to the home but you are going to pay a massive premium for these alternative. So while they are technically feasible alternatives, most businesses do not find financial justification for leasing these services for purposes of IP video systems.

The solution used, almost universally, is local recording of the IP cameras at the remote site. This is what DVRs have done for years and you can expect the same for NVRs for years to come as well.

Related Reports on Bandwidth

IP Networking Course May 2017 on Mar 28, 2017
This is the only networking course designed specifically for video surveillance professionals plus it includes live training, personal help and...
TVI 4.0 Doubles HD Analog Bandwidth on Mar 05, 2017
HD analog's move up market continues. Starting a few years ago at just 720p, HD analog is now poised for 4K and beyond. Techpoint, the company...
Arecont Vision MicroDome Duo Tested on Feb 14, 2017
Arecont Vision is back with another multi-head camera, this time thinking smaller with the MicroDome Duo, a two-imager model, with the tagline...
LAST DAY - Camera Course Winter 2017 on Feb 02, 2017
Learn video surveillance and get certified. IPVM provides live online classes, recorded videos, personal help, cutting edge education and...
Arecont Lowest Favorability Results on Jan 25, 2017
Given Arecont is 3 time defending integrator choice for worst camera manufacturer, it should be little surprise they had the lowest score in the...
Avigilon Pro 4K Camera Tested on Jan 03, 2017
Avigilon is best known for their large sensor, high megapixel cameras. But with new offerings from Sony and soon Axis, the questions is how well...
IP Networking 2017 Book Released on Jan 02, 2017
The new IP Networking Book 2017 is a 197 page in-depth guide that teaches you how IT and telecom technologies impact modern security systems. The...
Hikvision No on H.265 But Pro On H.265+ on Jan 02, 2017
Hikvision said H.265 was a 'solution in search of a problem' a half year ago but now they are getting bullish, embracing H.265+. In this report,...
Surveillance Cameras 2017 Review on Jan 02, 2017
This report concisely explains the developments and most common options for surveillance cameras offered in 2017, including resolution, H.265, HD...
Calculating Video Surveillance Storage / Bandwidth on Dec 29, 2016
Calculating surveillance bandwidth is complex, and inexperienced users can easily underestimate bandwidth, leading to reduced storage durations...

Most Recent Industry Reports

Chinese Government Spies on Churches With Video Surveillance on Mar 27, 2017
The Chinese government is using video surveillance to spy on churches in China, reports UCANews, explaining: The [Chinese government]...
Burglar Alarm Sirens Guide on Mar 27, 2017
Sirens are used to alert users to an alarm condition. In this note, we examine how to choose, locate, and install alarm sirens, including Siren...
Dahua Distributor Bad Breakup on Mar 27, 2017
A Dahua distributor in Europe claims that Dahua took over his top customers, revoked his distributorship status, and left him with a large amount...
Everbridge Mass Notification Service Examined on Mar 24, 2017
Everbridge is expanding in the security space. In January 2017 Everbridge acquired PSIM platform IDV, and have also begun integrating with other...
Hikvision Removing Auto 'Phone Home' on Mar 24, 2017
Facing pressure over their cameras auto phoning home and their Chinese government ownership, Hikvision has begun quietly removing automatic...
Axis Camera Vulnerabilities From Google Researcher Analyzed on Mar 23, 2017
A Google security researcher has reported 6 vulnerabilities for Axis cameras, affecting multiple models and firmware versions. In this report, we...
OpenEye Takes Aim At Exacq on Mar 23, 2017
First Milestone targeted Exacq with a takeover offer, and now OpenEye is gunning for them with an offer to swap out Exacq for their cloud-managed...
Lock Keyways For Access Control Guide on Mar 23, 2017
Lock keyways can be the difference between a lock working or not. Understanding keyways is important for access control. Indeed, a member recently...
Broken Browser Support for Video Surveillance on Mar 22, 2017
Modern web browsers have left the security industry behind. Current Chrome, Firefox, and Microsoft Edge browsers do not support NPAPI plugins,...

The world's leading video surveillance information source, IPVM provides the best reporting, testing and training for 10,000+ members globally. Dedicated to independent and objective information, we uniquely refuse any and all advertisements, sponsorship and consulting from manufacturers.

About | FAQ | Contact