What is a BlackBerry

Posted on December 3, 2011 by

A BlackBerry is basically a mobile e-mail and smartphone unit.  The most common of all BlackBerry devices is the smartphone which combines the functions and features of of a personal digital assistant (PDA), a media player, an internet browser and a gaming console. A BlackBerry Smartphone is capable of sending and receiving emails and instant messages whilst maintaining a high level of security between units.

BlackBerry smartphones and BlackBerry Internet Service are both very popular among mobile phone users. Currently, Blackberry is the fourth most popular device manufacturer, following Google, Sony Ericsson and Apple, and the BlackBerry Internet Service has over seventy million subscribers in over 90 countries worldwide.

Because of the popularity of BlackBerry products and services, selling BlackBerry units may be a good and lucrative business venture. Blackberrys can be sold through retail stores or through the internet via online shops. To increase the likelihood of success of an online BlackBerry shop, entrepreneurs must find good and reputable suppliers of units and then create a website with an online store on which to advertise and sell their BlackBerryt products.

A good online store / website should not only look good, it should also function properly. The key to well functioning web site is to have it hosted by a reliable web host provider. Reliable web hosting companies can be identified by reading web hosting reviews. Web hosting reviews, such as the Web Hosting Hub Review, are independently run web sites that rate a host’s products and services. These sites also publish impartial customer feedback from the host’s past or present clients and these data should help other consumers see if the company would be able to adequately meet the hosting requirements of a BlackBerry online store.

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Marine Terminal Workstations, Lines Of Sight, And GPS Systems

Posted on November 28, 2011 by

One of the most important ways that seafaring personnel keep in touch with land is through satellite communications. All boats and other vessels that head out to see are equipped with a marine terminal. This terminal links up with extraterrestrial receivers and routers; these satellites are in orbit, and they’re constantly sending and receiving data and communications packets. The seas are growing more and more crowded; more and more of our products and goods are being shipped by sea, with freight ships being capable of much faster speeds. This has only increased the need and necessity for marine terminal satellite phones and other workstations.

Communication isn’t just critical to coordinating your activities while out at sea, but is also a means for offering help to vessels that might need assistance. This is very similar to the social conditions of truckers that have to haul freight over long stretches of snow saddled tracks. In those situations, you rely on the same technologies that are involved in marine satellite communications. You often rely on satellites because setting up a land based network would simply be too expensive. And of course, at sea, a terrestrial option is fairly close to impossible. Continue reading →

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The Acknowledge and Not Acknowledge of data

Posted on November 22, 2011 by

The USB I2C Adapter has two lines: serial data line (SDA) and serial clock line (CSL). These lines connects an I2C master and an I2C slave. SDA line is used to transfer data bits from the USB GPIO/SPI/I2C master to the USB-SPI/I2C/GPIO slave. SCL line clocks pulses of data transmitting.

When the master transmits data, it begins with the generation of a START condition on the USB SPI/I2C/GPIO Bus. The I2C master sends byte by byte to the I2C slave.

The first 7 bits of the first byte is the address of the selected I2C slave, then goes the direction (read or write) and the last bit is Acknowledgment. The Acknowledgment bit (the 9th bit) is controlled by the master.

If the I2C slave is ready to receive another portion of data, it pull the USB I2C clock line down and the master understand, that it can continue the transfer and the Acknowledge takes place on the SCL line.

If the USB I2C slave can not receive data, it remains the clock line on a HIGH level on the SCL line. It means, that the byte was Not Acknowledge (NACK). In that case, the master can generate the STOP condition in order to cancel the transfer or a repeated START condition to send data one more time.

There are several origins of Not Acknowledge:

  • There is no receiver with such address connected to the Bus.
  • The slave is busy at the moment, so it can not start communication immediately.
  • The slave-receiver gets the command, which it does not understand.
  • The receiver con not receive any more data bytes.
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