by Dinesh Thakur Category: Communication Networks

1 Literally, not synchronized; that is, proceeding at its own pace.

2 In electronics, it describes circuits that do not operate in step with other devices controlled by a shared CLOCK SIGNAL.

 
by Dinesh Thakur Category: Communication Networks

Data Communication or Network Communication: It is the process of transporting data or information from one device to another.The channel or physical connection (path) through which the information is carried from sender(Source or origin) to the receiver(destination) is established using either cable (Physical media) or wireless media. The physical cable like twisted pair wire, coaxial cable, fiber-optic cable or wireless media like laser, radio waves, and microwaves.



 
by Dinesh Thakur Category: Communication Networks

Bit Error: An error in a single BIT within a BYTE or WORD of data transmitted over a noisy channel: for example if the byte sent was 11111111 then a received value of 11111101 would represent a bit error in the second bit. There are well-known ERROR DETECTION AND CORRECTION algorithms that can correct one or more such bit errors, given some extra, redundant information, and these techniques are widely applied in the mechanisms of HARDDISK and CD-ROM drives, as well as in telecommunication systems.



 
by Dinesh Thakur Category: Communication Networks

The IEEE 802.15 group was set up in March 1999 to reflect on wireless networks with a range of ten meters, or WPAN (Wireless Personal Area Network), with the aim of making connections between different portable one user or multiple users. This type of network can connect a laptop, cell phone, PDA or any other device of this type. Three service groups were defined, A, B and C.



 
by Dinesh Thakur Category: Communication Networks

WiMAX (Worldwide Interoperability for Microwave Access) is the result of an initiative launched in 2001 by the WiMAX Alliance. Its aim was to promote the IEEE 802.16 standard by proposing to verify compliance and equipment interoperability. As we shall see, many options have been proposed to achieve communication.

 
by Dinesh Thakur Category: Communication Networks

EtherTalk is Apple Computer software that allows the Macintosh to hook into Ethernet networks. To use EtherTalk and Ethernet, the Mac must have the Ethernet interface card installed inside the computer.



 
by Dinesh Thakur Category: Communication Networks

The package level or network layer is located on the third level of the hierarchy architecture reference model as shown in Figure.

 
by Dinesh Thakur Category: Communication Networks

The transfer rate, or "data rate" refers to the speed with which data is transferred from its source to its destination, such as from one computer to another over a network, or from the computer to the disk drive. It's measured like we would measure any rate of speed-in units of information per the unit of time, like miles per hour. On a computer you may hear transfer rates expressed in terms like bits per second, megabytes per second, or characters per second.



 
by Dinesh Thakur Category: Communication Networks

Another solution to obtain a broadband distribution network is to use the wiring of cable operators, when it exists. This wiring has long been made of CATV (cable TV), whose bandwidth exceeds 800MHz easily. Today, this infrastructure is slightly modified by the introduction of systems HFC (Hybrid Fiber/Coax), combining a fiber portion between the head end and the beginning of the service by the CATV. This topology is illustrated in Figure.

 
by Dinesh Thakur Category: Communication Networks

Before transmitting information on a transmission medium, it must be encoded of adequately. Networks must allow very high speeds over distances more or shorter. In this context, three approaches are possible for coding bits from applications:



 

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About Dinesh Thakur

Dinesh ThakurDinesh Thakur holds an B.SC (Computer Science), MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps. For any type of query or something that you think is missing, please feel free to Contact us.



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