Tag Archive for Web

Satellite broadband

Satellites in geostationary orbits are able to relay broadband data from the satellite company to each customer. Satellite Internet is usually among the most expensive ways of gaining broadband Internet access, but in rural areas it may be the only choice other than cellular broadband. However, costs have been coming down in recent years to the point that it is becoming more competitive with other broadband options.

Broadband satellite Internet also has a high latency problem is due to the signal having to travel to an altitude of 35,786 km (22,236 mi) above sea level (from the equator) out into space to a satellite in geostationary orbit and back to Earth again. The signal delay can be as much as 500 milliseconds to 900 milliseconds, which makes this service unsuitable for applications requiring real-time user input such as certain multiplayer Internet games and first-person shooters played over the connection. Despite this, it is still possible for many games to be played, but the scope is limited to real-time strategy or turn-based games. The functionality of live interactive access to a distant computer can also be subject to the problems caused by high latency. Additionally, some satellite Internet providers do not support VPN due to latency issues.[6] These problems are more than tolerable for just basic email access and web browsing and in most cases are barely noticeable.

For geostationary satellites there is no way to eliminate this problem. The delay is primarily due to the great distances travelled which, even at the speed of light (about 300,000 km/s (190,000 mi/s)), can be significant. Even if all other signalling delays could be eliminated it still takes electromagnetic radio waves about 500 milliseconds, or half a second, to travel from ground level to the satellite and back to the ground, a total of over 71,400 km (44,400 mi) to travel from the source to the destination, and over 143,000 km (89,000 mi) for a round trip (user to ISP, and then back to user—with zero network delays). Factoring in other normal delays from network sources gives a typical one-way connection latency of 500–700 ms from the user to the ISP, or about 1,000–1,400 milliseconds latency for the total Round Trip Time (RTT) back to the user. This is far worse than most dial-up modem users’ experience, at typically only 150–200 ms total latency.

Medium Earth Orbit (MEO) and Low Earth Orbit (LEO) satellites however do not have such great delays. The current LEO constellations of Globalstar and Iridium satellites have delays of less than 40 ms round trip, but their throughput is less than broadband at 64 kbit/s per channel. The Globalstar constellation orbits 1,420 km above the earth and Iridium orbits at 670 km altitude. The proposed O3b Networks MEO constellation scheduled for deployment in 2012 would orbit at 8,062 km, with RTT latency of approximately 125 ms. The proposed new network is also designed for much higher throughput with links well in excess of 1 Gbit/s (Giga bits per second). The planned COMMStellation™, scheduled for launch in 2015, will orbit the earth at 1,000 km with a latency of approximately 7 ms. This polar orbiting constellation of 78 microsatellites will provide global backhaul with throughput in excess of 1.2 Gbit/s.

Most satellite Internet providers also have a FAP (Fair Access Policy). Perhaps one of the largest disadvantages of satellite Internet, these FAPs usually throttle a user’s throughput to dial-up data rates after a certain “invisible wall” is hit (usually around 200 MB a day). This FAP usually lasts for 24 hours after the wall is hit, and a user’s throughput is restored to whatever tier they paid for. This makes bandwidth-intensive activities nearly impossible to complete in a reasonable amount of time (examples include P2P and newsgroup binary downloading).

Some systems have a FAP based on a monthly limit of data downloaded, with download data rates reduced for the remainder of the month if the limit is exceeded. Other Satellite Internet offers have advanced FAP mechanisms based on sliding time windows. These services verify download quotas during the last hours, days and weeks. The purpose is to allow temporary excessive downloads when needed while saving volume for the end of the month.

Advantages

  1. True global broadband Internet access availability
  2. Mobile connection to the Internet (with some providers)

Disadvantages

  1. High latency compared to other broadband services, especially 2-way satellite service
  2. Unreliable: drop-outs are common during travel, inclement weather, and during sunspot activity
  3. The narrow-beam highly directional antenna must be accurately pointed to the satellite orbiting overhead
  4. The Fair Access Policy limits heavy usage, if applied by the service provider
  5. VPN use is discouraged, problematic, and/or restricted with satellite broadband, although available at a price
  6. One-way satellite service requires the use of a modem or other data uplink connection
  7. Satellite dishes are very large. Although most of them employ plastic to reduce weight, they are typically between 80 and 120 cm (30 to 48 inches) in diameter.

ESET NOD32 Antivirus 5 Reviews

CNET editors’ review

Reviewed by: Seth Rosenblatt on September 15, 2011

The bottom line: Back from the nearly dead, or at least the un-updated, ESET returns with high-level security that’s light on your system. For a basic antivirus suite that’s light on your system and tough on malware, NOD32 gets a yes from us.

Review:

The last time ESET updated its two security suites–the antivirus and anti-malware-only NOD32 and the more feature-heavy alternative Smart Security–it was a different computer security world. It was March 2009: Anonymous barely existed, Stuxnet hadn’t gone public, and ransomware was the stuff of science fiction.

Version 5 of ESET NOD32 is a solid, creative attempt to create a suite that adapts to a rapidly changing threatscape, with an emphasis on generic detections and the now-commonplace reliance on both cloud and locally stored detections. Where NOD32′s bigger brother Smart Security 5 left us wanting more in the ancillary features department, the area that many don’t consider “core” security, NOD32 strikes a perfect pitch between features, price, and effectiveness.

Installation
ESET’s installation could be faster, although it’s by no means sluggish. It’s slowed down by a preponderance of screens, including registration, and an unnecessary query as to whether or not the user wants Potentially Unwanted Program (PUP) protection activated or not. While a legitimate query, there’s no reason for it to slow down the install by yet another screen to click through.

PUPs are definitely a security issue, though, so perhaps the program ought to just scan for them on the first scan automatically, and then ask you if it’s a scan you always want.

One decent thing about the registration process is that it’s all done from within the suite–no need to jump to your browser. Also, there’s no reboot required after the installation. Still, the one-minute-or-less installs from Norton and Trend Micro should be a goal that all security suites aspire to.

Interface
The layout of ESET 5 remains unchanged from version 4, except for minor details, although neither is quite as easy to use as it ought to be. The interface opens to a window indicating your security status. The default is colored green and labeled Maximum Protection, which changes to red and a warning when core security features, such as Network Protection, have been disabled. The center pane doesn’t indicate this very clearly, but the plain text Maximum Protection labels that tell you which parts of your computer and activity are protected are actually links. Click one to drill deeper into your settings, toggle features, and gain more granular control over your security.

The left nav lets you access other features, including Computer Scan, Update, Setup, Tools, and Help. To the interface’s credit, each tab’s layout is kept similar, and there are helpful mouse-over tooltips that help clarify things like the differences between default scans, but key features, like the Advanced Settings window, are hard to find.

Along with a lack of clarity about how to get around ESET’s interface is the confusion created by redundancy. There’s nothing gained by making things harder to find, and even savvy users will probably have to take more time than necessary to get up to speed.

Features and support
ESET NOD32 5′s core features put the suite at or near the top of its class. Its collection of features, while not revolutionary, are nevertheless extremely well implemented. What it lacks are many of the modern ancillary features that justify the higher price.

On the side of the basics, there are two default scans: a “Smart Scan” and a custom scan. ESET has improved its antivirus and antispyware engines so that they don’t detect only threats, but prevent your host files from corruption before the bad guys go after you. There’s removable media control, so you can block USB keys or external drives from connecting to your computer, and the new gamer mode automatically initiates silent running whenever a program is running at full screen. This is perfect for movies and presentations, as well as games. You can also activate it from the system tray.

ThreatSense, ESET’s cloud-based detection, isn’t new–yep, it had it three years ago–but it’s been expanded in version 5 to include reputation analysis. All of that comes in the basic NOD32. Upping to Smart Security gets you antispam, parental controls, and a “smart” firewall that learns how your computer uses the Internet very quickly.

ESET’s browser guards are browser-agnostic, and don’t require an extension. You won’t get search results ratings, but ESET successfully blocked us from attempting to reach known dangerous Web sites clicked on in search results.

It’s not too much of a stretch to say that ESET owns the Support space. In addition to the hot-line support, forums and knowledge base, no other security suite offers an education module like ESET does. Called “Cybersecurity Training,” the module features an interactive city that you can explore to learn about how to protect yourself, your personal data, and your computer when online. It’s an in-depth approach that we wish other vendors would take, because at the end of the day, it’s going to be your own wits that keep you safest.

It’s accessible from the installation CD if you buy the physical boxed copy of the program, and we’re not sure just yet about how to launch it from the downloadable version.

Performance
ESET’s overall performance presents a reliable security option. It’s not the most effective security suite we’ve seen this year, and the benchmarks leave room for growth, but overall it’s a solid, secure choice, with low false positives and a light touch on your computer’s performance.

Real-world test results for ESET were confusing. On our real-world test computer, an x86 Windows 7 laptop that we use for all hands-on testing of security suites, ESET scans were invariably slow and ponderous. On average, the first scan took nearly two hours, and subsequent scans were only faster by about 20 to 30 minutes. These marks did not match up to CNET Labs’ results, which found ESET’s scan times on a freshly imaged computer to be among the fastest results we’ve seen so far this year. Because of the large number of programs that get installed and uninstalled on the real-world laptop, which could adversely affect the computer’s Registry, we’re inclined to favor the labs results in this case.

CNET Labs’ benchmarks found both ESET Smart Security 5 and ESET NOD32 5 to have performed generally well above average. Note that we can’t directly compare this year’s results with last year’s because we upgraded our testing computer from Windows 7 x64 to Windows 7 x64 with Service Pack 1.

Smart Security slowed down the Labs’ computer boot time by an average of 17.2 seconds–five seconds faster than the average of all suites tested to date this year–whereas NOD32 5 added an impressively low 13.9 seconds. For both programs, ESET’s boot time impact was minimal.

Both suites had a small impact on the computer’s shutdown time, slowing it down only by about six to seven seconds longer than an unprotected computer. However, it should be noted that the shutdown time for an unprotected computer was half that, so even though ESET’s impact was minimal when compared with other suites, it’s still having a big affect on the computer itself.

On all of CNET’s in-use system performance tests except for the Cinebench test, ESET’s impact was extremely minimal. The Cinebench results were close to the average level of impact. So, all things being equal, you’re not going to notice much when ESET is running as you go about your computing business. This was borne out by our real-world tests, too.

Conclusion
ESET returns to a tougher security world, not just from the competition but from the threats that it’s meant to protect you against. Though the benchmarking is generally solid, we found the interface too annoying and the installation too cumbersome to award it higher marks.

Google Chrome Review

Google-ChromeCNET editors’ review

Reviewed by: Seth Rosenblatt on September 16, 2011

The bottom line: Competitiveness, thy name is Chrome. Google’s browser is one of the fastest and most standards-compliant browsers available. It lacks some of the fine-tuning you’ll find in Firefox, but from the minimalist interface to support for future-Web tech like Native Client and HTML5, the browser is a must.

Review:
Google Chrome continues to mature from a lightweight and fast browsing alternative into an innovative browser on the precipice of a potential browsing revolution with the just-released Chrome OS. The browser that people can use today, Chrome 14, offers highly competitive features, including synchronization, autofill, and standards compliance, and maintains Google’s reputation for building one of the fastest browsers available.

Chrome 14 represents a major milestone for the browser, but those expecting to see dramatic changes in major-point updates will be disappointed. For a while now, Google has been pushing features over what it calls milestone numbers, which means that as soon as new features are usable in the beta version of Chrome, Google will likely push them to all users in the stable edition.

 

Google Chrome specifications

What’s new in version 14.0.835.163

Version 14.0.835.163 contains two significant technologies which allow developers to create even more powerful web apps and games:

The Web Audio API enables developers to add fancy audio effects such as room simulation and spatialization.

Native Client is an open-source technology which allows C and C++ code to be seamlessly and securely executed inside the browser. Currently, Native Client only supports applications listed in the Chrome Web Store, but we are working to remove this limitation as soon as possible.

General

  • Publisher Google
  • Publisher web site http://www.google.com/
  • Release date September 16, 2011
  • Date added September 16, 2011
  • Version 14.0.835.163

Category

  • Category Browsers
  • Subcategory Web Browsers

System requirements

  • Operating systems Windows 7, Windows Vista, Windows XP
  • Additional requirements Not available

Download information

  • File size 590.35K
  • File name ChromeSetup.exe

Popularity

  • Total Downloads 7,301,744
  • Downloads last week 113,194

Pricing

  • License model Free
  • Limitations Not available
  • Price Not available