Tag Archive | "S1"

Why DNS Propagation Takes So Long?

Tags: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,


After getting your domain name registered, paying off to your web host to get hosting for your website, and uploading your website on the web server, its time to view the final shape of your website. If you cannot view your website after all this hard work then does it mean it that you are missing something or is it just something with DNS propagation?

dns propogation

Understanding DNS Propagation

Before understanding the DNS propagation, you should be aware of the working of DNS. A master DNS is created by your web hosting provider in the event when you set your website up with it. This Master DNS is recorded in the Domain Name Server of your web hosting provider. The company which registers your domain name contacts to the DNS server of your web hosting provider. Your domain name registrar does it as the master authority of your domain which you have registered with it.

How Your Website is Being Searched?

When an outsider source searches your website, it first switches to the registration database in order to find out about the DNS authority of your website. After then that it goes to the DNS sever of your web hosting service provider in order to find out the IP address of your website’s domain name. From this IP address, this outsider source locates your website and can view your website.

Caching the DNS Records

The only problem with this searching process is that when your website is searched on internet by an outside source, the search process is catalyzed, as every ISP caches it DNS records to display your website in quick time. Read the full story

DynaTAC to iPhone: A History of Wireless Phones

Tags: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,


If you have been around for a while, you are a witness to the fastest evolution of technology in history. Wireless Phones (also called mobile phones and cell phones) are no exception to this statement. Since 1983 ,they changing shape so fast that it is breathtaking to watch to advancements. If someone slept all the time from 1980′s to this day, It would be very difficult for him to recognize most of the stuff around him. He sure will be unable to tell the use of an iPhone.  It is indeed very hard to find a similarity between a Motorola DynaTAC 8000X( from 1983) and Apple’s iPhone(2007).

Wireless technology behind the wireless phone also evolved from 1G to 3G over time. According to techbiz.blog.com

wireless technology evolution

First generation of cellphones (1G) used analog signal transmission technique for communication between mobile and base stations. FDMA (Frequency Division Multiple Access) was the de facto protocol for distributing available frequency band among concurrent users. 1G cellphones were predated by mobile radio telephone technology (usually considered as 0G). Both 0G and 1G supported basic voice communication only.
2G introduced digital signal transmission technique along with TDMA (Time Division Multiple Access) and CDMA (Code Division Multiple Access) protocols. 2G needs much more careful consideration in order to understand the cellphone convergence as the two most prominent standards groups in worldwide cellular arena today – GSMA and CDG – have their roots here.

We have collected below some of very important milestones in history of wireless phone evolution.

Motorola DynaTAC 8000X  (1983)

The Motorola DynaTAC 8000X started the wireless communication revolution. It was also know as “brick” phone. suffered mostly from low battery life and signal loss issues.

First Wireless PhoneMotorola DynaTAC 8000X

Read the full story

Calendar

August 2011
M T W T F S S
« Jul    
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 30 31