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                                           Network Cabling   This section may be skipped by those more interested on the software aspects of networking or those learning networking, but all readers should at some time be aware of the terminology used in this section since they are used with regard to cabling. If this section is skipped by those learning networking, it should be read later. This section should be read by those who plan to physically install their own network.  Types of Transmission Baseband - Data bits are defined by discrete signal changes. Broadband - Uses analog signals to divide the cable into several channels with each channel at its own frequency. Each channel can only transmit one direction. Physical media Twisted pair - Wire is twisted to minimize...

COLOR-CODE STANDARDS Again, please bear with me...  Let's start with simple pin-out diagrams of the two types of UTP Ethernet cables and watch how committees can make a can of worms out of them.  Here are the diagrams: Note that the TX (transmitter) pins are connected to corresponding RX (receiver) pins, plus to plus and minus to minus.  And that  you must use a crossover cable to connect units with identical interfaces.  If you use a straight-through cable, one of the two units must, in effect, perform the cross-over function. Two wire color-code standards apply: EIA/TIA 568A and EIA/TIA 568B.   The codes are commonly depicted with RJ-45 jacks as follows (the view is from the front of the jacks):   If we apply the 568A color code and show all eight wires, our pin-out looks like this:         Note that pins 4, 5, 7, and 8 and the blue and brown pairs are not used in either standard.  Quite contrary to what you may read elsewher...

ആൻഡ്രോയ്ഡ് സ്മാർട്ട്ഫോണുകൾ ഉപയോഗിക്കുന്ന പലരും കേട്ടിരിക്കാൻ സാദ്ധ്യതയുള്ള ഒരു പദമാണു ആൻഡ്രോയ്ഡ് റൂട്ടിംഗ്. പക്ഷെ, മിക്കവർക്കും റൂട്ടിംഗ് എന്താണെന്നോ അതെങ്ങ...

USB 1.1: Released in August 1998, this is the first USB version to be widely adopted (the original version 1.0 never made it into consumer products). It has a top speed of 12Mbps (though in many cases only performs at 1.2Mbps). It's largely obsolete. USB 2.0: Released in April 2000, it has a max speed of 480Mbps in Hi-Speed mode, or 12Mbps in Full-Speed mode. It currently has the max power out put of 2.5V, 1.8A and is backward-compatible with USB 1.1. USB 3.0: Released in November 2008, USB 3.0 has the top speed of 5Gbps in SuperSpeed mode. A USB 3.0 port (and connector) is usually colored blue. USB 3.0 is backward-compatible with USB 2.0 but its port can deliver up to 5V, 1.8A of power. USB 3.1: Released in July 26, 2013, USB 3.1 doubles the speed of USB 3.0 to 10Gbps (now called SuperSpeed+ or SuperSpeed USB 10 Gbps), making it as fast as the original Thunderbolt standard. USB 3.1 is backward-compatible with USB 3.0 and USB 2.0. USB 3.1 has three power profiles (according to USB ...

1. Amazon, originally a printed book seller company, now sells more e-books than printed books. 2. The first domain name ever registered was  Symbolics.com . 3. 80% of all pictures on the internet are of naked women 4. Tim Berners-Lee coined the phrase “World Wide Web” in 1990. 5. U.S. President Bill Clinton’s inauguration in January 1997 was the first to be webcast. 6. Google uses an estimated 15 billion kWh of electricity per year, more than most countries. However, google generates a lot of their own power with their solar panels. 7. Bill Gates, the founder of Microsoft was a college drop out. 8. Bill Gates house was designed Using a Macintosh computer. 9. About 1.8 billion people connect to the Internet, only 450 million of them speak English. 10. In 2012, approximately 17 billion devices (which includes computers, tablets and mobile) connected to the Internet. 11. Sweden has the hightest percentage of internet users, they are 75%. 12. Did you know that Email was already around...

Like most mechanical devices, laser printers sometimes fail to work or produce unexpected or inconsistent results. Each model of laser printer is different, and may develop different faults. The following chapter describes some of the problems which occur on laser printers, and the likely sources of such problems. The advice given in this chapter is not a substitute for the troubleshooting section in a laser printer user manual, but it may give some insight about why a particular problem occurs.  Read the cautions below before attempting to correct any problem, and always read and obey the cautions and procedures given in the laser printer user manual before attempting to use the procedures described in this chapter . Caution : some procedures in this chapter require the examination of the photoreceptor. The photoreceptor is light sensitive and should not be exposed to light for long periods. Do no expose a photoreceptor to light for more than a few minutes or print quality may det...

1960കളില് മസാച്ചുസെറ്റ്സ് ഇന്സ്റ്റിറ്റ്യൂട്ട് ഓഫ് ടെക്നോളജി (MIT) യുടെ ടെക് മോഡല് റെയില്റോഡ് ക്ലബ് (TMRC) ലും MIT ആര്ട്ടിഫിഷ്യല്‍ ഇന്റലിജന്സ് ലബോറട്ടറിയിലുമാണ് ഹാക്കര് അല്ലെ...