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by Dinesh Thakur Category: Computer Network

The physical layer represents the first level of the hierarchy of the reference model. This level is responsible for transporting the bits on physical media varied. To access a support, use an access interface.

 
by Dinesh Thakur Category: Computer Network

Shared Ethernet Networks implementing technical standard access to physical media by the IEEE 802.3 working group under the name MAC access (Medium Access Control). MAC uses a general technique called random access.

 
by Dinesh Thakur Category: Computer Network

The idea at the basis of the wavelength routing network consists of maximum reuse the same wavelengths. The figure illustrates a node of a routing network wherein wavelengths of the same wavelength are used repeatedly.

 
by Dinesh Thakur Category: Computer Network

The Optical Switches are used to connect optical links between them. At incoming optical fibers correspond outgoing optical fibers. If the switch uses an electrical part, the switch is said optoelectronics and not only optical. These switches are based on the interconnection of switching elements, that is to say, switches which have two input gates and two output ports as shown in Figure. Connected in series, these elementary switches allow making great switches.  The design of these devices, however, poses many problems.

 
by Dinesh Thakur Category: Computer Network

VDSL modems (Very high bit rate DSL) achieve speeds much higher than ADSL modems, but a few blocks away. Their capacity is several tens of megabits per second. VDSL modems can make the output of a PON (Passive Optical Network) to extend their connection to the user. PON being in ATM technology, VDSL modems must in this case accept the ATM frame.

 
by Dinesh Thakur Category: Communication Networks

Transmission media is a pathway that carries the information from sender to receiver. We use different types of cables or waves to transmit data. Data is transmitted normally through electrical or electromagnetic signals.



 
by Dinesh Thakur Category: Communication Networks

The first layer (physical layer) of Communication Networks the OSI Seven layer model is dedicated to the transmission media. Due to the variety of transmission media and network wiring methods, selecting the most appropriate media can be confusing - what is the optimal cost-effective solution.

 
by Dinesh Thakur Category: Communication Networks

The term Transmission Mode defines the direction of the flow of information between two communication devices i.e. it tells the direction of signal flow between the two devices.

There are three ways or modes of data transmission: Simplex, Half duplex (HDX), Full duplex (FDX)



 
by Dinesh Thakur Category: Communication Networks

ALOHA: ALOHA is a system for coordinating and arbitrating access to a shared communication Networks channel. It was developed in the 1970s by Norman Abramson and his colleagues at the University of Hawaii. The original system used for ground based radio broadcasting, but the system has been implemented in satellite communication systems.

 
by Dinesh Thakur Category: Communication Networks

Definition Data Transmission: When we enter data into the computer via keyboard, each keyed element is encoded by the electronics within the keyboard into an equivalent binary coded pattern, using one of the standard coding schemes that are used for the interchange of information. To represent all characters of the keyboard, a unique pattern of 7 or 8 bits in size is used. The use of 7 bits means that 128 different elements can be represented, while 8 bits can represent 256 elements. A similar procedure is followed at the receiver that decodes every received binary pattern into the corresponding character.



 

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