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Mirror sites at your disposal

Friday, June 8th, 2012

Did you know there are selected websites you have free access to? These websites are known as mirror sites.

In computing, a mirror is an exact copy of a data set. On the Internet, a mirror site is an exact copy of another Internet site. Mirror sites are most commonly used to provide multiple sources of the same information, and are of particular value as a way of providing reliable access to large downloads. Mirroring is a type of file synchronization and a  live mirror is automatically updated as soon as the original is changed.

But why the need for more than one version of the same website. A few reasons are:

  1. To preserve a website or page, especially when it is closed or is about to be closed.
  2. To allow faster downloads for users at a specific geographical location. For example, a U.S. server could be mirrored in Japan, allowing Japanese Internet users to download content faster from the local Japanese server than from the original American one.
  3. To provide access to otherwise unavailable information. For example, when the popular Google search engine was banned in 2002 by the People’s Republic of China, the mirror elgooG was used as a way of effectively circumventing the ban.
  4. To preserve historic content. Financial constraints and/or bandwidth prevent the maintainers of a server from keeping older and unsupported content available to users who still may desire them; a mirror may be made to prevent this content from disappearing.
  5. To balance load. If one server is extremely popular a mirror may help relieve this load this server may become overloaded with demand. Alternative download points allow the total number of download requests to be spread among several servers, maintaining the availability of the distribution.
  6. As a temporary measure to counterbalance a sudden, temporary increase in traffic.

SOURCE: www.wikipedia.org

Therefore, before you download huge files from an international server and run up an exorbitant internet account, check whether there is a local version available. The following websites are available to you free of charge:

A large amount of software downloads are available at http://support.sun.ac.za

MIT OpenCourse Ware: http://ocw.sun.ac.za

Mirror server for linux: http://ftp.sun.ac.za

Mirror services available for free via TENET: http://www.mirror.ac.za

The most popular Linux distros are available (Ubuntu,Debian, Fedora, Opensuse, Mandriva etc.)

Complete programming language mirrors are availabla at:

CPAN (perl): http://ftp.sun.ac.za/ftp/pub/mirrors/ftp.funet.fi/pub/languages/perl/CPAN/

CTAN (Tex/Latex): http://ftp.sun.ac.za/ftp/pub/mirrors/ftp.dante.de/tex-archive/

Python: http://ftp.sun.ac.za/ftp/pub/mirrors/ftp.python.org/

Mathematical languages:

SageMath: http://ftp.sun.ac.za/ftp/pub/mirrors/www.sagemath.org/

Scilab (http://ftp.sun.ac.za/ftp/pub/mirrors/scilab/www.scilab.org/

R http://ftp.sun.ac.za/ftp/pub/mirrors/cran.za.r

Octava http://ftp.sun.ac.za/ftp/pub/mirrors/octave

Opensource software:

sourceware.org: http://ftp.sun.ac.za/ftp/pub/mirrors/sourceware.org/pub/

Free Office packages:

LibreOffice: http://ftp.sun.ac.za/ftp/pub/mirrors/libreoffice/

OpenOffice: http://ftp.sun.ac.za/ftp/pub/mirrors/openoffice/

Downloadable antivirus updates:

Mcafee: http://ftp.sun.ac.za/ftp/pub/mirrors/ftp.nai.com/

Symantec: http://ftp.sun.ac.za/ftp/pub/mirrors/ftp.symantec.com
/public/english_us_canada/antivirus_definitions/norton_antivirus/

Adobe Reader: http://ftp.sun.ac.za/ftp/pub/mirrors/ftp.adobe.com/

SOURCE:  www.wikipedia.org

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Too many line options to choose from?

Thursday, June 7th, 2012

Nowadays we’re fortunate (depending on our budgets of course) to have internet access at home. We can quickly Google a recipe instead of scurrying to find the right cookbook or piece of paper you wrote the recipe down on somewhere. Or quickly look up the name of that actor whose name is on the tip of your tongue and you’re convinced your husband has the wrong one.

Unfortunately being spoilt for choice also brings more confusion at times. On top of having to choose the right service provider, you can also choose your line speed.  iAfrica  explained it for us in simple terms.

SOURCE: www.iafrica.com

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Broadband or Big Mac?

Friday, May 25th, 2012

Broadband prices plummeted over the last decade, but the same cannot be said for many other products. Rudolph Muller from www.mybroadband.co.za investigated and stumbled upon a few interesting numbers.

ADSL and mobile data prices have plunged over the last decade. The total cost of an ADSL service dropped by over 50% since it was launched in 2002 while mobile data costs decreased by 96% over the last 10 years.

In 2002 a basic 512 Kbps ADSL service cost residential customers R966.72 per month (R67.72 for analogue line rental, R680 for ADSL access and R219 for a 3GB data bundle). In comparison, the price for a 384kbps connection with 5GB of data is now priced at R358.97 (R219.00 + R139.97).

Even more significant price cuts are visible in the mobile data market. In 2002 a 10MB data bundle from Vodacom cost R200 (hence R20 per MB). Today users can buy a 1GB data bundle from the same company for R99 (10c per MB).

Broadband prices have seen price cuts of between 50% and 95% over the last decade. These price reductions were partly fuelled by lower international bandwidth prices made possible by SEACOM.

When compared with products such as petrol and food, broadband stands out as having bucked the trend of price increases.

The following table provides an overview of the price changes of a few products over the last 10 years.

Service 2002 2012 Change

Telkom ADSL
Consumer ADSL access (512kbps/1Mbps) R680 R289 -58%
Business ADSL access (512kbps/1Mbps) R800 R289 -64%
3GB of blended ADSL data R219 R59.4 -73%
Analogue line rental R68 R140 107%

Vodacom mobile data
Out of bundle R45 R2 -96%
MyMeg 10 R200 R9 -96%

MultiChoice pay-TV
DStv premium R349 R590 69%

Fuel
Petrol R4.26 R11.77 176%

Big Mac
McDonald’s Big Mac burger R9.00 R20.95 133%
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Access to Library e-resources changing shortly

Friday, May 25th, 2012

Until now free internet access to the US Library Services’ subscription based electronic resources were managed by a setting in users’ browsers.

This setting, known as the PAC file, consists of a list of the electronic resources the library provides free internet access to. It mainly consists of agent and subscription e-resources, although, in some cases, exceptions were made to make subject specific resources available for free. Due to the ongoing decrease in internet costs this privilege will be suspended from 1 July 2012.

Due to the increase of e-resources on the internet, as well as the recent upgrade of the campus firewall and SANReN connection, the browser setting is no longer a practical method to gain access to free internet. In future free access to e-resources will only be available on the library’s website. Users can create new bookmarks from the Library’s e-database list  in their browsers if they still need access.

This new method is applicable to desktop computers, as well as laptops on and off campus. From July 2012 users no longer have to change the configuration of their browser on their laptops when they switch between working at home or the office.

Take note that you do need to use your Inetkey at all times for access to these free e-resources when working on the campus network.

These changes will be applicable from 1 July 2012.

Article supplied by Wouter Klapwijk, Information Technology, Library and Information Service

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Just browsing

Friday, May 25th, 2012

Way back when the internet was still in it’s baby shoes, the only options for web browsers were Internet Explorer and Netscape. Thankfully things have changed and today you can choose a web browser according to your own needs – whatever they might be. We made some notes so you can have more time to surf the net.

Nowadays most browsers are more than adequate. The leaders in the race, Google Chrome, Firefox and Internet Explorer, are all packed with handy functionalities and on par with new developments. In the end it all depends on what you prefer.

The most important requirement is probably speed and here it seems as if Google Chrome is taking the lead. With “Chrome Instant” you see the pages you are looking for even before you’ve finished typing the address or title. An application that thinks ahead – literally! Chrome is  the only browser with a built-in Flash-player and pdf reader. It also handles HTML5 the best of all browsers and with it’s new hardware acelaration it’s increasingly becoming the popular choice.

However Google Chrome is not the only fast browser. Internet Explorer 9 gave Microsoft’s fading browser a much needed need boost, with JavaScript speed comparable to Chrome, and even started its own performance improving trend—graphics hardware acceleration. IE9’s Javascript is comparable with Chrome and maybe IE9’s greatest advantages is it’s integration with Windows 7. You can also permanently “pin” websites on your taskbar – a handy extra if you don’t like using bookmarks. Just remember you need at least Windows 7 or Vista to run Internet Explorer 9.

Do you want to synchronise all your bookmarks, settings and internet history seamlessly? Them Firefox is for you. It can even sync with it’s own mobile Android version. Firefox also has the most innovative way of organising  a lot of tabs with it’s panorama grouping function. Firefox’s startup speed, memory usage and security has improved quite a bit over time and can keep up with any of the other browsers.

If you want to have a look at the detailed statistics of each browser’s performance,  read more here.

SOURCE: www.lifehacker.com

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